NCSU CDK Setup & Example

ECEPurdue University

Design Kit Setup

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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’

Design Kit Setup

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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 5.1.41

Design Kit Setup

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You should see following windows including the libraries:

Design Kit Setup

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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

Design Kit Setup

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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 Add > Instance 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

Design Kit Setup

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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

Example

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Common-source amplifier schematic

Example

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Supply voltage = 1.8V Input vsin:

Amplitude = 10mV Frequency = 20MHz AC magnitude = 1

Idc = 100uA

Example

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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

Example

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For simulation: Open Analog Design Environment (ADE)

Go to Setup > Simulator/Directory/Host…:Change Simulator from ‘hpiceS’ to ‘spectre’After change, you will

see

Example

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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’

Example

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DC analysis (example setting)

Example

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Tran analysis (example setting)

Example

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AC analysis (example setting)

Example

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DC analysis ADE > Results > Annotate > DC Operating

Points/DC node volt

Example

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

Example

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