Category: PCB DESIGNING

In this category we will learn about PCB design

WHY DESIGN MULTI LAYER IN PCB ?

Here, we are going to know why we design a Multi Layer PCB or why Multi Layer PCB design is required?

Here are some of the points (reasons) based on we can understand why it is required to have a multi player PCB design?

  1. If weight and volume savings in interconnections are the overriding considerations
  2. When the complexity of interconnection in sub-systems requires complicated and expensive wiring or harnessing
  3. If frequency requirements call for careful control and uniformity of conductor wave impedance with minimum distortions and signal propagation, and where the uniformity of these characteristics from board-to-board is important.
  4. When coupling or shielding of a large number of connections is necessary with multi-layer, all interconnections can be placed on internal layers, and a heat sink of thick solid copper should be placed on the outer surfaces.

PCB Design Software List

In this tutorial we are going PCB Design Software List

Allegro (Cadence)
Altium
Ariadne
AutoTRAX
Bartels AutoEngineer
BoardMaker3
Board Station (Mentor)
CADint
Cadstar (Zuken)
CIRCAD
CircuitCREATOR
Circuit Wizard 20
CsiEDA
CR-5000 (Zuken)
DipTrace
Douglas CAD/CAM
Dreamcad
Eagle (Farnell/Newark)
Easy-PC
EDWinXP
Expedition Enterprise (Mentor)
ICADPCB (Fujitsu)
Layo1 PCB
McCAD
Orcad (Cadence)
Osmond PCB
Pads (Mentor)
PCB Elegance
Proteus PCB Design
Pulsonix
Rimu Schematics/PCB
Scooter PCB
Sprint-Layout
SuperCAD/SuperPCB
Target 3001
TINA (DesignSoft)
TopoR
Ultiboard (National Instruments)
Vutrax
WinCircuit
WinQcad
XL designer (Seetrax)
Gerber tools
GCPrevue (Graphicode)
GerberLogix
Gerbv
Gertool
Cam350
Cad/Cam
CamExpert
Viewplot
ZofzPCB 3D Gerber Viewer

In this tu

What Is PCB Design Process ?

In this tutorial we are going to What Is PCB Design Process ?

Hardware Engineer
• Concept of design
• Rough “scribble” of schematic
• Breadboard proofing of concept
PCB Designer
• Hand draw full schematic
• Hand draw layout of component placement (2x, 4x)
• Hand tape circuitry on to mylar film
• Hand inking of components and board nomenclature
• Drill templates created using dots, donuts, symbols
PCB Manufacturer
• Photo-reduction of taped artwork
• Chemical etching of copper laminates
• Hand cut silk screens to squeegee onto board
• “Bulls eye” drilling of holes
• Hand mounting and soldering of components
• Hand probes used to test functionality
ADVANCEMENT MADE
PCB Manufacturing
• First to utilize advancement in automation and computers
• Digitizing replaces photo-reduction
• NC Drill replaced “Bulls eye” drilling
• Photographic imaging to create silk screens
• “Pick & Place” machines for component mounting
• Wave solder machines reduces hand soldering
• Designing
• Hand drawing layouts(2x,4x) digitized to create 1x film artwork
• CAD programs developed for board layout
• Output of Gerber data to create 1x film artwork
• Output of NC Drill tapes

PCB SPECIFICATION SHEET

In this tutorial we are going to learn about PCB SPECIFICATION SHEET

PCB SCIENTIST  Pvt. Ltd.PCB SPECIFICATION SHEETDOC. No. : FM/RD/11
REV No.  : 02
DATE      : 01-07-2010
  
 1PCB Drawing No.     LD-22P0-S001-R00 
 2PCB Type                 Single Sided 
 3PCB unit Size                 22×30 MM 
 4Laminate  Material  MC-PCB 
 5Laminate Thickness1.6mm±0.05MM 
 6Copper Thicknesss
(Outer & Inner layers)
35 µM Finish  
 7Thermal cunductivity2W/m-K 
 8Panel Lay-up(X * Y) 5×4 
 9PCB unit per Panel  20 
 10PCB Panel size        120×130 MM 
 11Panel Fudicial Mark Global 
 12PCB Cutting              Routing 
 13Solder Maskwhite, top side only 
 14Legend Printing       Black, single side 
 15Surface FinishHAL 
 16TestingBBT 
 17Packing Standard 
 18PTH SlotNIL 
 19NON-PTH SlotNIL 
    
 Note 1:Given drill size should be maintain as per drawing. 
     
     
     
 DatePrepared byApproved by 
 14.02.20   
 SATSandeepSINDHU 

WHAT IS RC TERMINATION IN PCB DESIGN ?

In this tutorial we are going to lean about WHAT IS RC TERMINATION IN PCB DESIGN ?

AC termination is recommended most for clock applications. An example of AC
termination is when a 75? impedance is coupled with a 100pF capacitor. That allow for leakage in input impedance of the receiver, A resistor is selected to be larger than the trace impedance. That allow for rapid transition of the clock edge, the capacitor value is selected at 120pF. The higher capacitor value allows for heavier current levels to pass. However, higher capacitive values increases power dissipation.
Capacitor values less than 50pF diminish the effectiveness of termination.
This method terminates the signal transition & therefore should be calculated based on the edge rate. This method’s disadvantage is that 2 components are needed for each line. Termination packs are sometimes used to reduce component count. Be aware that signal coupling can occur between signals in the termination pack. An RC circuit arranged in series to a voltage source, usually ground, makes a dynamic termination. The result of this is the cut off of glitches & overshoot.

What is Termination in PCB Layout Design ?

In this tutorial we are going to learn about What is Termination in PCB Layout Design ?

A component (typically a resistor/diode) added at the end of the line to establish a relationship of the load/source impedance with line impedance. The termination of interconnect topological is required when increasing clock frequencies & faster rise & fall times begin to impact the electrical performance parameters on the PCB. For high speed board design, there are 5 common termination techniques described below which may be a lied to the design to contain the impact on signal integrity & losses.
Some commonly known termination techniques are series termination,parallel termination & Thevenin termination.

WHAT IS PROCESS OF PCB DESIGN ?

In this tutorial we are going to learn about WHAT IS PROCESS OF PCB DESIGN ?

1) BILL OF MATERIAL ( BOM)

Tabulation of all parts and materials used in the construction of a printed board
assembly Can be a Separate Parts List or Integral Parts List
Minimum information required per IPC-D-325:
Item (Find) Number
Electrical component cross-reference
part Information
(1) Components (2) Hardware (3) Bulk Materials
Quantities
Referenced Processes

SCHEMATIC For PCB


· In Schamatic , Electrical connection of all components as per provided by hardware team .
In Schematic All Reference of components should be proper
In scematic must be check DRC before create Net list
GND & Power track should be proper separate by Symbol
VCC decoupling Capacitor place near to IC pin of VCC.
Crystal placement close to controller .

PCB Design Layout


first Check the all connection with schematic
Second placement of all components step by step as per flow of schematic
In PCB design Analog & Digital track should be separate as per schematic
GND layer design at bottom layer so that it would be work as a heat shink
High Power track should be from low power signal

GERBER For PCB

After final the PCB design the set the Gerber setting as per Layer.
Like if Gerber is one then we set the Bottom, SSB, SST, Solder masking & drill Layer

What is PCB Design & Manufacturing ?

In this tutorial we are going to learn about What is PCB Design & Manufacturing ?

Manufacturing For PCB
• First to utilize advancement in automation and computers
• Digitizing replaces photo-reduction
• NC Drill replaced “Bulls eye” drilling
• Photographic imaging to create silk screens
• “Pick & Place” machines for component mounting
• Wave solder machines reduces hand soldering
Designing For PCB
• Hand drawing layouts(2x,4x) digitized to create 1x film artwork
• CAD programs developed for board layout
• Output of Gerber data to create 1x film artwork
• Output of NC Drill tapes

What are the PCB thicknesses of FR-4 Laminates?

In this tutorial we are going to learn about What are the PCB thicknesses of FR-4 Laminates?

FR4 Double sided (Rigid laminate)
thickness copper (h=half ounce = 17μ, 1 = 1 ounce = 35μ, 2 = 1 ounce = 70μ)
0,80mm h-h
1,55mm h-h
1,55mm 1-1
1,55mm 2-2
2,00mm 1-1
2,00mm h-h
2,40mm h-h
2,40mm 1-1
3,20mm 1-1
FR4 Multilayer (Thin laminate)
0,002 h-h
0,005 h-1
0,005 1-1
0,008 1-1
0,008 1-2
0,008 2-2
0,010 1-1
0,014 h-1
0,014 1-1
0,014 2-1
0,014 2-2
0,018 h-1
0,018 1-1
0,022 h-1
0,022 1-1
0,022 1-2
0,022 2-2
0,028 1-1
0,028 2-2

0,028 h-1
0,036 1-1
Polyimide laminate
0,005 h-1
0,005 1-1
0,008 2-1
0,008 2-2
0,008 1-1
0,010 1-2
0,010 2-2
0,022 1-2
0,022 2-2
Flexible laminates
Rogers product series 2000:
20FR-C-110 2 mils polyimide, 1 mil acrylic adhesive
20FR-C-210 2 mils polyimide, 2 mil acrylic adhesive
Dupont AP series:
AP8525 2 mils adhesiveless 17/17 copper
AP9121 2 mils adhesiveless 35/35 copper
AP9222 2 mils adhesiveless 70/70

What is Guide lines for Ground Planes in PCB design

In this tutorial we are going to learn about What is Guide lines for Ground Planes in PCB design

Inadequate return path(grounding is one of the major sources of emission. If its not correctly designed.
Try to keep it as short as possible. To improve the return path(through the ground), suggestions are,
· Have a solid ground plane in the PCB stack-up. This ensures that a ground return path is always
running underneath the high frequency and power traces.
· Stitch all the ground planes together to ensure equal potential
· Fill all unused open areas between traces on signal layers with the GND & stitch it to the adjacent ground plane.
· In PCB design the ground plane should be as large as possible.
· Border the PCb with chassis GND or place the VCC plane back from the edge of the board by 3
times the distance between the planes.
· Use multi point grounding to keep GND impedance low at high frequency.
· Keep the ground plane uninterrupted(avoid traces & via on ground planes).