====== 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