1. NCSU CDK Setup & Example
ECE
Purdue University

2. Design Kit Setup We will use NCSU TSMC 0.2-µm CDK in this tutorial
Open a terminal window,
If you like, you can make your working directory
In this tutorial, the working directory is HOME directory
Copy the following files to your working directory
cp /package/eda/cells/ncsu-cdk-1.5.1/local/cdssetup/cds.lib ~/
cp /package/eda/cells/ncsu-cdk-1.5.1/local/cdssetup/cdsenv ~/.cdsenv
cp /package/eda/cells/ncsu-cdk-1.5.1/local/cdssetup/cdsinit ~/.cdsinit
cp /package/eda/cells/ncsu-cdk-1.5.1/local/cdssetup/simrc ~/.simrc
Don’t miss ‘dot’

3. Design Kit Setup In your terminal window,
Please type a following to load your cadence/NCSU setup:
source /usr/site/ece/bin/edacfg mmsim ncsu hsp cscope
You need to do the above step whenever you open Cadence. To avoid repetition, you are encouraged to add the command line in your .cshrc
If you use ‘ecegrid-lnx.ecn.purdue.edu’ and ‘grid command’, the above command line should be in your .cshrc
Open Cadence in your working directory
You can type ‘icfb &’ or ‘grid icfb &’ to open Cadence
We are going to use Cadence version

4. Design Kit Setup
You should see following windows including the libraries:

5. Design Kit Setup
We will design a common-source amplifier using NCSU TSMC 0.2-µm process
Create a library
In Library Manage: File > New > Library
Type a library name (ex: tutorial) and check ‘Attach to existing tech library’
Then, select ‘TSMC 0.20u CMOS018 (6M, HV FET,…)’  OK
Create a cell view (schematic)
In Library Manage: File > New > Cell View
Enter Cell Name (ex: Amp). Make sure ‘View Name: schematic’ and ‘Tool: Composer-Schematic’  OK

6. Design Kit Setup Create a schematic in a schematic editing window
To add an NMOS transistor
Add > Instance
Select ‘NCSU_Analog_Parts’ for Library and click ‘N_Transistors’ in ‘Component Browser’. Select ‘nmos4’, which is a 4-terminal transistor
Then you can change the instance properties and add the symbol on your schematic window
To add a passive divice
Select ‘NCSU_Analog_Parts’ for Library and click ‘R_L_C’ in ‘Component Browser’. Select a device you want
The NCSU design kit unfortunately provides only ideal passive devices

7. Design Kit Setup
To add an ideal component such as voltage source, current source, etc
Add > Instance
Select ‘analogLib’ for Library and click a category which an instance you want belongs to in ‘Component Browser’. Select the component
Then you can change the instance properties and add the symbol on your schematic window
Note: The number of finger of a transistor does not work, and please use the multiplicity instead of the number of finger

8. Example
Common-source amplifier schematic

9. Example Supply voltage = 1.8V Input vsin: Idc = 100uA Amplitude = 10mV
Frequency = 20MHz
AC magnitude = 1
Idc = 100uA

10. Example Now, we have finished an initial design
In this tutorial, we will cover following analyses in Analog Design Environment DC
DC operating point
Tran
Transient simulation AC
Frequency response

11. Example For simulation: Open Analog Design Environment (ADE)
Go to Setup > Simulator/Directory/Host…:
Change Simulator from ‘hpiceS’ to ‘spectre’
After change, you will see

12. Example Include model files: Go to Setup > Model Libraries…
Browse ‘/package/eda/cells/ncsu-cdk-1.5.1/local/models /hspice/public/tsmc20N.m’ and add and OK
If you want to use PMOS transistors, you also need to include a file of ‘tsmc20P.m’

13. Example
DC analysis (example setting)

14. Example
Tran analysis (example setting)

15. Example
AC analysis (example setting)

16. Example
DC analysis
ADE > Results > Annotate > DC Operating Points/DC node volt

17. Example Tran analysis ADE > Results > Direct Plot > Main Form
Voltage gain = 187.2mV / 20mV = 19.4 dB

18. Example AC analysis ADE > Results > Direct Plot > Main Form
DC gain = 19.47dB, f-3dB = 336MHz