This shows you the differences between two versions of the page.
|
pcb_testing [2014/09/10 19:28] |
pcb_testing [2014/09/10 19:28] (current) |
||
|---|---|---|---|
| Line 1: | Line 1: | ||
| + | ====== Testing equipment ====== | ||
| + | The testing lab contains a number of high performance and expensive equipment. Acquaint yourselves with the equipment by reading the manuals to get the best out of them. Here is a [[testlabequipments|list of instruments in the testing lab]]. | ||
| + | |||
| + | ^ Purpose ^ Document ^ | ||
| + | |Brief tutorial on data capture using 1682AD logic analyzer|{{1682ad_data_capture.pdf}}| | ||
| + | |Histogram based INL/DNL measurements (Appln note from Maxim)|{{inl_dnl.pdf}}{{inl_dnl.m}}| | ||
| + | |Tutorial for ORCAD|{{ORCAD_tutorial.pdf}}| | ||
| + | |LabView tutorial|{{labview_tutorial.ppt}}| | ||
| + | |||
| + | |||
| + | ====== OrCAD Tips ====== | ||
| + | |||
| + | ===== Drawing Schematics ===== | ||
| + | * Use seperate symbols for electrolytic capacitors and surface mount capacitors. | ||
| + | * While using electrolytic capacitors, pay attention to the positive and negative terminals. Terminal 1 in schematic should be connected to higher voltage and terminal 2 to lower voltage. | ||
| + | * Maximum value of non-polar surface mount cap is 1uF (@ modi electronics, ritchie street). | ||
| + | * Use seperate symbols for thru-hole resistors and surface mount resistors. | ||
| + | * There is a pushbutton in Orcad to generate 'Bill Of Materials'. This will aid in determining which all components to purchase. | ||
| + | |||
| + | |||
| + | ===== Printing Schematics ===== | ||
| + | * To save schematics as PDF, first you will need to install PDF995 ( a free software). | ||
| + | * Change print setting to 'Landscape', and output as 'PDF995'. | ||
| + | |||
| + | ===== Placement ===== | ||
| + | * First switch off 'Online DRC'. Else you will be unable to reorder the footprints. | ||
| + | |||
| + | ===== Routing ===== | ||
| + | * Before starting to route, we must fix the width of each net. Tools-->Net-->Select from Spreadsheet. Here we can fix the min,typ and max width of each net. For GNDA and VDDA it is 12,50,100, and for other nets 12,25,50. | ||
| + | * To start routing click 'Add/Edit Route Mode' button in the task bar. | ||
| + | |||
| + | ===== Submission ===== | ||
| + | * .MAX file contains the layout and .DSN file contains the schematic. | ||
| + | * Only the .MAX file needs to be submitted for fabrication. No need to generate the GERBER files. | ||
| + | * The shape of the PCB need not necessarily be a square/rectangle. | ||
| + | |||
| + | ===== PCB Fabrication / Component purchase ===== | ||
| + | |||
| + | |||
| + | ====Fabrication==== | ||
| + | * Printed Circuit Services(Zeta), I-1, Dr.V.S.I Estate, Near NIFT, Thiruvanmiyur. **Ph: 22541641, 42150860**, **Email: plot@zetapcs.com** | ||
| + | * Tessolve | ||
| + | |||
| + | ====Technical information about the PCB==== | ||
| + | * Type of material used : FR-4(an abbreviation for Flame Retardant 4, a glass reinforced epoxy laminate used for making printed circuit boards.) | ||
| + | * Dielectric Constant: Varies according to the frequency applied and depends on the vendor.(A value of 4-4.5 seems to be appropriate for high frequency designs >1GHz) | ||
| + | * Standard thickness of board: 1.6 mm | ||
| + | * Thickness of copper trace: 35 µm | ||
| + | |||
| + | The above information can be used to determine the trace impedance. | ||
| + | |||
| + | ====Component Purchase==== | ||
| + | * Modi Electronics, No 6, 1st floor, Ritchie Street. **Ph: 28414140** | ||
| + | * Mercy Electronics, L.B Road, Adyar. **Ph: 24464481** | ||
| + | * Mency Electronics, Tharamani Road, Velachery. **Ph: 22434773, 42082097** | ||
| + | * Texonic, Ritchie Street. **Ph: 28410638** | ||
| + | * Globe Tronics, Ritchie Street. (All kinds of male/female connectors, adapters etc.) **Ph. No: 42119262, 42149503** | ||
| + | * SRICOM(Srinar Communications) (RF Cables, Connectors, and other accessories...) http://www.sricomworld.in/; email : mtk@sricomworld.com\\ **Ph.No : +91 9841005125 (Mr. Ismail)** | ||
| + | |||
| + | ====Assembly==== | ||
| + | Sri International | ||