DFM for flex and rigid-flex PCBs with SMT involves selecting application-specific circuit construction types, laminates, coating thickness, trace routing strategies, bending, and EMI capabilities. The PCB stack-up has eight layers, with controlled impedance traces on layers 1, 2, 6, and 7. Design for manufacturing (DFM) guidelines resolves potential issues that can occur during the manufacturing and assembly of circuit boards. If JLCPCB's 4-layer PCB is. 3. When selecting a multilayer stackup we should consider the following: • A signal layer should always be adjacent to a plane. Note: The trace on the inner layer need to be much wider than the trace on the outer. [2] Calculate the top layer signal end impedance: Two tools are giving Zo=48 and Zo=47. Configuring the PCB for Controlled Impedance Routing. The following is the usual stackup information(4,6,8 layer PCB standard stackup), which also can be used as stackup of impedances. We started offering design layout services because, for our customers, it comes down to completing the project onIn terms of how these calculators work, the impedance of a transmission line in a PCB can be calculated in four ways: Use the R, L, C, G parameters from the Telegrapher’s equations to calculate the impedance of the transmission line. Signal integrity is about the quality of the signal passing through a transmission line. Blind vias exist from: Layers 1 to 3; Layers 1 to 4; Layers 5 to 8 Stackup Editor Zoom: Hybrid Design Shield: Mask:. I'm confused, because when i use jlcpcb impedance calculator to calculate 50 ohm SE traces for high speed data, I end up with. The 1+N+1 stack-up is the simplest one without microvias. 05. Sierra Circuits is capable of fabricating circuit boards with a tolerance of ± 5% for controlled impedance. Add a damping resistor near the source. Powerful impedance design system;. 7 design rules to reduce crosstalk in your PCB designs. If you need custom FPC stackup, please make note and we will manufacture according to your requirement. Once these decisions are made, a designer needs to determine the PCB trace width required to hit their required PCB transmission line impedance. Z-planner Enterprise contains a stackup calculator which ensures signal integrity across a PCB for various controlled impedance models to quickly simulate electrical performance. My doubt is about the RF trace that should have 50 ohms impedance. Critical Length. Land on the best stackup by getting precise data, including: dielectric thicknesses, copper weights, layer order, impedance layers and reference layers. The stripline impedance calculator provided below is useful for gaining an initial estimate of trace impedance for striplines. 6mm (4L-01) When using our free Defined layer buildup 4L-01, you will reach the desired impedances e. A copper of a specific weight is rolled on one square foot area of a layer in the board. Route signals to ensure the return path is directly underneath the signal trace. Unit: Options are mm, mil, μm, and inch. The next important part of the electronic circuit design process is to draw the schematic diagram using EDA tools like Altium, KiCAD, and Cadence Allegro. Herndon's (Apple) paper from DesignCon 2003 "Noise Allocation for Near-end Crosstalk and for Uncertainty in Characteristic Impedance". 0. The tool implements numerical solutions of. 01) and dielectric constant (3. 6- layer PCB stack-up. Impedance examples 4 layers 1. Good stackup management allows you to obtain excellent products. PCB. It is tough to find and fix every single fault in a circuit board. Technical Report. Linked to our 2D field solver-based impedance calculator to design high-speed traces; See what Laurent Nicolet has to say about the future of PCB etching. Incorporate coaxial via geometry. The fabrication house can have the. Here, = resistivity at copper. subtract 3 from 3x to isolate x)1,370. The ‘ripple%’ points to the maximum voltage deviation. It’s library of PCB laminate material reduces material costs without sacrificing performance. Call us: +1 (800) 763-7503 Email us: through our Customer Care form. The iCD Stackup Planner features a precision 2D Boundary Element Method (BEM) Field Solver providing customers with the accuracy and simulation speed they need for high-speed PCB Design. The advantage of HDI is higher yield due to better control of drill to copper and use of traces above 3 mils. T= Experimental temperature. Controlled impedance. Design and stackup in altium, For ex: 8 layers and impedance control of 100 ohms on layer 2 and 7 and ask your fabricator to suggest a stackup for same 8 layers and trace impedance of 100 ohms for layer 2 and 7 and compare the values. Signal problems can abound when trace width values are incorrectly specified in high-speed PCBs. Notice that there is no impedance information on the stackup drawing. Max. The dialog can be used in two modes: Simple or Advanced. Calculation of impedance and trace width. These files are utilized for the PCB manufacturing and assembly process. The stackup defines what layers are in your PCB, what thickness each layer of copper is, and what the thicknesses of the cores or substrates between the copper layers are. Atlas Si for Touchstone – PCB Insertion loss processing with Delta-L 4. Used interchangeably with controlled dielectric by some PCB designers. Use 7. The impedance of a trace is calculated based on the placement of plane and signal layers in the PCB stackup. 24 hours a day, 7 days a week. The design engineer must take charge of the design to mitigate the above issues. 6 layer rigid-flex PCB stack-up with air gap 8 layer rigid-flex stack-up with air gap. 3 How to calculate the average effective. Controlling the impedance in your design is dependent on the board layer stackup you choose. These are precisely the characteristics of a pair of lines to be designated as a differential pair. 3. Dielectric constant = 3. The material thickness between layers 1 – 2 should be 4 mils, max. Detailed analysis in Excel Interface option. In tab “TransLine” i chose “Coupled Microstrip Line” and i can calculate the impedance of only one track. This paper presents a flexible and efficient methodology to optimize stack-up for multi-layer printed circuit boards (PCBs) with enormous search space and various design constraints. Other aspects such as stack-up and material selection also play crucial. Gerbers provide information about each and. You can also calculate the accurate drill diameter, via to via spacing, and the thermal vias that. 0994mm vs. A cross-hatch plane is shown in the image below. The parasitic capacitance and inductance. Always, ensure symmetry of the build-up. Solder a jumper or a wire to repair the trace. I'm working on open source software defined radio based on XC7Z020. To meet those requirements I used some online impedance calculators to estimate the required trace properties for a. 2 is an example of the amount of information that must be included in the stackup drawing to ensure the PCB is correctly fabricated. Cost increases with the number of layers because of more production steps, more materials, and additional production time. Controlled Impedance PCB Parameters and Stackup. Each power. Learn More about using the Altium Designer’s impedance calculator in this brief tutorial. Using the built-in Simbeor ® impedance calculator, the PCB editor's Layer Stack Manager calculates the trace width needed to deliver the specified impedance. Place your components, vias, coupling capacitors. Altium Designer's Layer Stack Manager includes an integrated. 1. PCB Stackup or Buildup – a brief history. Controlled impedance is the characteristic impedance of a transmission line formed by PCB traces and its associated reference planes. Remember – the tighter the tolerance the more the PCB will cost. If your design has controlled impedance traces, you can use our built-in impedance calculator. 3. What's Inside. I used the KiCAD PCB calculator, asked the PCB manufacturer about the tangent loss (0. You can reduce this effect by implementing coaxial via structure. For your convenience, we have designed an Impedance Calculator to help you calculate the impedance and the trace width you require. A schematic diagram is a representation of the elements of a system using abstract and graphic symbols. A coplanar waveguide calculator will operate in one of two ways. Generally, soldermask will. The impedance calculator in the Allegro stack-up editor uses a static 2D field solver by default (bem2d). Signal problems can abound when trace width values are. The elastic nature of flexible PCBs allows for placement around edges and folds. Off the top of my head, I can think of Polar and z-calc but I never liked these. AS9100D – Military & Aerospace. An HDI PCB stackup does not require a specific number of layers. Polar UK: Speedstack PCB – PCB stackup / Impedance field solver package. Distance between tracks (s) = 254 micron. Use impedance calculation tools for specific dimensional values based on your design requirements. 4 mil (1 oz finished thickness), respectively. This note provides a brief look at how stackups have progressed from the single sided PCB to HDI builds with their multiple layers and multiple passes through the production process. As a rule of thumb, a four layer board will produce 15 dB less radiation than a Double side PCB board. Calculates the bandwidth of a digital signal and maximum trace length, using the IPC-2251 method or the frequency domain method, for transmission line effects. But in general do these things: Use a Sig/Gnd////Gnd/Sig stackup for more consistent impedance at top and bottom. ] [use a calculator. It defines the acceptable variation between the maximum and minimum limits. Z-planner Enterprise contains a stackup calculator which ensures signal integrity across a PCB for various controlled impedance models to quickly. It is called ‘turnkey’ as PCBA. Selecting and routing on prepreg vs. The dielectric constant of air is 1,and the dielectric constant inside the pcb stackup is usually 1. 0 for analysis with Si9000e. For PCBs carrying signals above 1GHz, and even frequencies above. For Si engineers & PCB technologists. JLCPCB Impedance Calculator. The purpose of filling vias is to: Avoid the entry of any impurities. The common ones are: single-ended characteristic impedance = 45/50/55/60 ohms, differential characteristic impedance = 85 /90/100 ohms. The PCB stackup is the substrate upon which all design components are assembled. The microstrip is a very simple yet useful way to create a transmission line with a PCB. 2. 2 Foreword the theoretical, but also the practical elements. A PCB stackup positions a PCB’s insulators and copper in layers before the final layout design is complete. For a Dk = 4. Below is an example of HDI stack-up generated using the Stackup Designer. For example, good layering can reduce the impedance of the board and limit radiation and crosstalk. This tool allows you to create, edit, and simulate your PCB design, and provides. A stripline PCB geometry is around 75% thicker than a microstrip design. Each layer in your PCB plays a specific role in determining electrical behavior. Procedure to use the calculator: 1. Propagation delay (t pd) in PCBs is the time taken by a signal to travel through a unit length of a transmission line . More reliability: The improved signal integrity and power distribution make the 8-layer PCB more reliable than its lower-layer counterpart. Repeat #1 for differential impedance. 2. Here’s a PCB design for assembly checklist you can refer to before you proceed with the assembly process. Online calculators will generally use Wadell's equations to determine the transmission line impedance numerically. The tool calculated impedance at 50 ohms for my stackup but it complains that it violates an IPC-2141A constraint where trace height over trace width must be less than or equal to 0. Stack-up for FPC. The target impedance value of a design is given by the equation: = ( V x ripple%) / ( 50% x Imax) The formula represents a combination of voltage fluctuation and transient current. Note that the built-in impedance calculator does not account for the affect of vias, it assumes lossless transference from one signal layer to the next. Sierra Circuits leads the industry in quality and turnaround times. 0175mm of Copper (1/2 oz), gives me a best estimate of 9mil trace, 4mil space for a 90R differential microstrip impedance. This microstrip impedance calculator gives you a good start for estimating the trace width and PCB dielectric thickness that will produce a target impedance value. The two impedance controlled lines I have are for USB (90 ohms differential), and a 2. /sq. HDI stack-up: 16-layer board with through-hole, buried and staggered blind vias ITEQ Stackup Pro TM. 3) to calculate trace width and. By integrating these DFA checks into your design. Prepreg. Consider the following points to limit the flexible PCB errors in the bend areas: Avoid 90-degree bends. 2313 Prepreg 4. PCB impedance and loss-planning tutorial. Add a damping resistor near the source. To mitigate these factors, first determine the loss budget for your targeted protocol. Assuming the differential pair I am routing is requiring 90 ohm (this is what the hardware guideline say "Route the USB differential pair on the top layer with a trace width and differential spacing tuned to the PCB stack-up for 90Ω differential impedance "). Historically, the primary electrical requirements have been a controlled impedance in the signal layers and enough copper in the plane layers to deliver DC power to the circuits mounted on the PCB. An RF PCB design is a bit different from a conventional board. HDI boards and key considerations 8 layer HDI PCB. 5. The differential one makes sense, but it looks like for single ended 50 ohms, their calculator only suggests a trace width. PCB stack-up design. In air gap construction, the flex layers are kept as several independent sets of no more than three layers per set. Stick to these design rules when you’re designing your stack-up. Using a power plane as signal reference. Many will also be able to include an impedance test coupon on each panel that they fabricate - this can be used to measure the real impedances. ShareThe number of layers is one of the crucial factors in designing HDI boards. This tool calculates the impedance of a conductor based on various inputs and circuit type. By understanding the microstrip transmission line, designers can. The cost index provides a relative idea of the cost compared to another layer order. The JLCPCB Impedance Calculator computes track width values and recommended stack-ups from user-input values of board thickness, copper weight, layer,. 1 mil as the thickness when the controlled impedance tracks are on top/bottom, use 8. In the early days of printed circuit board (PCB) manufacturing, the board was simply an insulating core layer, clad with a thin layer of copper on one or both sides. A PCB's impedance depends on trace geometry, materials, and layer configuration. The. Stack-up assistance included. Length of both tracks should be the same. Although 2 layers per set are optimum, the IPC 2223 standard allows for 3 layers, if a design incorporates controlled impedance lines in the. Developing an efficient stackup is a complicated process championed by innovative companies such as Candor, a leading PCB manufacturer. A hybrid stackup construction enhances your PCB’s performance and cost-effectiveness by combining different materials or technologies. Call us: +1 (800) 763-7503 Email us: through our Customer Care form. Typical 12 layer PCB stack-up. 8-layer HDI stack-up generated using Stackup Designer. It provides vital information like material thickness and copper weights. Conductor Impedance. 4 1 0 4 42. Using the built-in Simbeor ® impedance calculator, the PCB editor's Layer Stack Manager calculates the trace width needed to deliver the specified impedance. JLC's [url=. You’ve probably also seen some calculators. The design requires controlled impedance traces. Used by PCB manufacturers to refer to selection of dielectrics and thicknesses to hit a trace width/spacing specification, or modification of trace geometry, to hit an impedance target. 2mm, copper thickness from 18μm to 210μm (0. The impedance information must be included by the layout designer in the fabrication drawing notes. Once you know the characteristic impedance, the differential. 3 mm min holes and 0. This is assuming that you have a Design Rule in place which links the impedance profile to a. The copper and dielectric fabrication layers are configured on the Stackup tab of the Layer. 05 (Compatible with Atlas versions up to v19. 25. Many will also be able to include an impedance test coupon on each panel that they fabricate - this can be used to measure the real impedances achieved on. A well-designed PCB stackup can maximize the electrical performance of signal transmissions, power delivery, manufacturability, and long-term reliability of the. But it lacks the differential impedance (impedance between these two tracks). Turnkey PCB manufacturing services involve: Fabrication solutions: Design review, sourcing dielectric materials, and bare-board manufacturing. PCBCart's Standard PCB Layer Stack-up. The tool implements numerical solutions of Maxwell’s equations to render accurate and consistent results. To calculate PCB trace resistance, The 50 ohm PCB trace calculator is designed considering the following formula. . The characteristic impedance of both traces should be the same to maintain balanced signaling. For a standard thickness 6-layer PCB, typical values are 0. In particular, we looked at some of the basic stackup and routing rules needed to support a digital interface like I2C or SPI. Gnd plane is also well connected (I carved the PCB to make sure vias connected to it). 033 inches. The PCB : 4 layers, 1mm thick, designed for JLCPCB's impedance controlled stackup JLC7828. 2mm (7. Always measure the bend radius from the inside surface of the bend. Enable the Stack Symmetry option in the Properties panel. A few of them are summarized below. I cut the side of the PCB to verify the material thickness and measured 0. 0. Step-by-step process of sequential lamination 4-layer PCB stack-up. In the rule shown above, the preferred width and min width have been set to the value defined in the impedance profile. An impedance calculator is integrated within this tool which you can use to compute the necessary impedance, trace width, and spacing values for any signal layer. 2. The standard copper weight we use is 1 oz or 1. Altium Designer. PCB stackup calculator and Si8000m controlled impedance field solver - professional PCB stack up design and documentation. PCB Trace Width Calculator. Microstrip allows for thinner flexible PCB design (2 layers with a thin core), whereas stripline increases flex thickness considerably (3 layers with 2 thicker cores). PCB Laminates & Materials Impedance calculators: Using the data created by the layer stackup generator, the impedance calculator will give you the correct width for your controlled impedance lines. The Sierra Circuits High-Speed Design Guide helps you design PCBs with signal frequencies from 50MHz to as high as 3GHz and beyond. The IPC-2141 trace Impedance calculator will help make initial design easier by allowing the user to input basic parameters and get a calculated impedance according to the IPC-2141 standard. Here are some of the patent-pending analysis features in Z-zero software: Loss planning, including copper roughness — Layer by layer calculation of loss as a function of geometry, Df, copper roughness on both sides and frequency. Polar Instruments Ltd. The Saturn PCB software. Figure 3. 2, the resulting trace width required for 50 Ohm impedance would be 15. RLC Resonant Frequency and Impedance Calculator. Contents. Maintain symmetry in your build-up. A schematic shows the components that are used in the design and how they are connected together. 2 Impedance trace / space 2. JLCPCB Impedance Calculator. The standard 4-layer stackup uses two inner layers for power and ground, and the two outer layers are for components and trace routing. Mistakes occur while designing a circuit board. For instance MacroFab's stackup state a 1. Automated tracking of glass-reinforcement pitch — for mitigating glass-weave skew (aka: fiber-weave effect). PCB Materials and Stackup Design Guidelines. The following is the usual FPC stackup information. Controlled Impedance routing is all about configuring the dimensions of the routes and the properties of the board materials to deliver a specific impedance. Our Impedance Calculator is based on 2D numerical solutions of Maxwell’s equations for PCB transmission lines. The simplest way for a controlled impedance is to just calculate some track width, (and gap for differential pairs), send the geometry to any PCB manufacturer and hope for the best. 8 chapters - 115 pages - 150 minute read. The alternating current that runs on a transmission. In other special cases or Advanced PCBs (you need to choose " Additional Options" and custom stackup or control impedance): 1. Select the number of substrate layers. While this calculator will provide a baseline, any final design considerations should be made towards loss, dispersion, copper roughness, phase shift, etc. 2. PCB Impedance-Calculation: Help with the dimensioning of the impedances of your circuit board. For example, for a simple coated microstrip with a target impedance of 75Ω it would not be unusual to specify a tolerance of ± 5%; typically, though, impedance is more often specified with a tolerance of ± 10%. For example, if an ideal part is to be 10mm with a tolerance of ± 1mm, any part that falls between 9 and 11 mm will be acceptable. A well-designed PCB stackup can maximize the electrical performance of signal transmissions, power delivery, manufacturability, and long-term reliability of the finished product. PDN impedance is one of those critical concepts in high speed PCBs, but many designers leave it as an afterthought. PCB Coplanar Waveguide Calculator RF. Speedstack PCB stackup design tool is a packaged combination of the Si8000m field solving impedance calculator and the Speedstack professional layer PCB stackup design system. Contents. The tool also calculates signal losses of any given trace. elongation plot of Kapton type HN polyimide material. Fundamentally, copper weight is a measure of copper thickness on the board. 3) to calculate trace width and. Above image illustrates all traces on this large PCB are the same size. Fortunately, the return path analysis tools in PCB layout CAD systems can easily find and report these problems to the designer. Freedom of design. Thickness. 3) You mentioned controlled impedance line, but forget the effect of SMD pads. You can then define each layer as a plane or signal layer. Figure 2. Advice for 90 Ohm traces of a USB 2. This starts with the layer stackup being configured to support high-speed, RF microstrip, and stripline routing. 24 hours a day, 7 days a week. Altium Designer's Layer Stack Manager and routing tools provide a smooth PCB impedance calculator for high-speed designs. The stackup drawing must contain more information than in the past, and the fabrication notes will need to be expanded. 0. High-density interconnects (HDI) PCBs are the boards with a higher. For the PCB design engineer today, there is a lot that needs to be considered when creating a PCB design. Explanations of signal integrity issues. The grid of layers is divided into 2 regions, the layers in the stackup are displayed on the left, then for each signal layer in the stackup there is a layer displayed in the. TOP - SIGNAL L2. You have this backwards, the common rule is to use impedance control when the electrical length of the trace is more than 1/10 of a wavelength at the frequency of interest. 5 mil (0. An ideal 6-layer. Released in 2009, it considers the impact of thermal conductivity, board thickness, dielectric material, and the presence. g. Higher data rates/faster edge rates are more prone to failure due to errors that are inherent in using simple calculator applications and an online calculator. It enables engineers and designers to understand and control the intricate aspects of PCB layout. So you computed a 100Ω impedance and it gave you 6/9mil for a differential pair. There are a few methods for calculating trace impedance in a circuit board as long as the dielectric constant and trace geometry are known: Use the IPC-2141 equation for microstrip or stripline impedances. Using a layer stack manager with a field solver will give you the most. Layer 6 - Signal/Power. I dont know which calculator is correct or how incorrect each one is respectively. For your convenience, we have designed an Impedance Calculator to help you calculate the impedance and the trace width you require. where Z 0,surf can be computed as specified in Eq. Sierra Circuits’ Via Impedance Calculator uses the physical dimensions of a via to calculate its capacitance, inductance, and impedance. Viewed 318 times. Understanding transmission lines and controlled impedance. Since it directly references the stackup information and has a. PCB stackup calculator. Sampson. Metal. It is a full-featured Excel-based tool that helps plan the PCB stack-up so that controlled impedance traces can be effectively implemented. Good tensile strength: Even though they are flexible, polyimide board materials have commendable tensile strength. 623134. I'm unsure if the reference plane would be the GND and the PWR layers. To estimate the cost of your PCB design optimization, you can use a PCB design software tool, such as KiCad. The importance of a good layer stackup in your PCB design and understanding the challenges in creating it. P = placement tolerance. Additionally, for Flex-Rigid design,. 679 nH/inch. A PCB impedance calculation generally refers to the task of calculating trace impedance, or transmission line impedance, based on the stackup and material configuration used in your design. One thing is for sure: When you are routing a high-speed PCB design you are going to be working with. 6mm thickness and the connector is a SMA. Allegro ® layout editors – Allegro ® PCB Editor and Allegro ® Package Designer Plus – include a spreadsheet-based user interface, Cross-section Editor to help you define an accurate layer stackup with. I am planning to have the PCB (4 layer) manufactured at JLPCB controlled impedance service. Polar Instruments Ltd . g. But to avoid issues with etching precision, you better use wide lines for 50 Ohm, by using another layer for ground that has larger distance = more substrate thickness. This is an 8-layer HDI PCB with a 48 mil total thickness. After selecting the relevant impedance model, you’ll have to key in the input parameters. 24 hours a day, 7 days a week. There are some advantages to using a microstrip transmission line over other alternatives. Sierra Circuits’ Via Impedance Calculator uses the physical dimensions of a via to calculate its capacitance, inductance, and impedance. Cost optimization is one of the major objectives when designing a PCB. It works in parallel with the standard. width|space|width. 4 GHz antenna (50 ohms single ended). 2116 Prepreg 4. 5 oz. 2116 Prepreg 4. Using the goal seeking facilities of the field solver to obtain the correct impedance for a structure. Track width (w) = 137 micron. Speedstack PCB Stackup Design and Documentation . In the below graph, you can see that the elongation is directly proportional to the stress. Introducing the industry's first 3D web-based printed circuit board stackup design tool. 0. 3 Common mistakes to avoid in the stack-up 2. The characteristic impedance is generally defined to. It enables engineers and designers to understand and control the intricate aspects of PCB layout. Characteristic impedance matching means that when the signal energy is transmitted, the load impedance is. Cross-hatched copper plane in a flex stack-up for controlled impedance. PCB Substrate Material Selection and Stackup Design Due to the parasitic effects mentioned earlier, you will need to carefully select a substrate material and design your stackup. Formulas from IPC-2141A Design Guide for High-Speed Controlled Impedance Circuit Board. Bandwidth Calculator & Max PCB Trace Length Calculator. 29 relative dielectric constant. Controlled differential impedance starts with characteristic impedance. eu. Create and professionally document PCB stackups in an instant. 6mm) That should give the traces around 90 Ohms differential impedance according to the PDF, but when I try to input it to my impedance calculator (Saturn PCB toolkit V7. If the ratio is about 0. Case 1: 8-layer HDI board design specifications. If the PCB stackup is done differently, where the signal layer is closer to the power/gnd plane, then the trace can be thinner while still having the proper impedance. Characteristic impedance or surge impedance is the impedance of a PCB transmission line without including the effect of other transmission lines. It is generally accepted to keep the gold thickness to 2-4 μin, as per the IPC-4552 ENIG. Ideal board stackup from top to bottom is shown in Table 1. I use Saturn PCB Design ToolKit -> Conductor. Complex PCB requirements; Mil-Spec & Class 3 with HDI Features; Blind &. Impedance is a cornerstone of. Based on my understanding of a 4-layer stack-up, one of the best set-up I chose is 8 mil trace space and 10 mil trace thickness. Figure 3. Designing for a Specific Impedance [The stackup dielectric will determine what size of trace you need to use in order to conform to the particular impedance. • When using an impedance calculator, the outer layers of the PCB contain less glass than. The characteristic impedance is given by: Eq. Dimension:There are many calculators available online, as well as built into your PCB design software. For thicker boards, the diameter is > 6 mils. Find out More. 1 of the Microstrip Calculator using H2 in place of h, εr,eff can be computed as specified in Eq. The build-up provides the following information: The copper thickness and weight. Step-by-step process of sequential lamination 4-layer PCB stack-up. Getting a good PCB with accurate controlled impedances needs a proper selection of PCB material and control of dimensions such as trace thickness, trace width, and dielectric thickness. For a 0.