cadence - reg.

[USK]

any body tell me, how can we calculate the power consumption of
circuit using cadence.
and also i want to know, how to plot Ids vs Vout graph, temperature
analysis and so on.

thank you

 

[Riad KACED]

Hi USK,

1. There are many ways doing this. One basic way to calcute the power
is to know the current consumption and then multiply by the Supply
voltage. How to achieve this ? Make a symbol for the design you want
to simulate, say an 2-stage amplifier. Instantiate the symbol in a
test bench schematic. Add the stimulus into that testbench, i.e. the
input signals. Instead of connecting the Ground Pin of your Design
Under Test directly into the ground, stick a 0V DC source from the
analog lib or an iprobe from the basic lib anc then connect it to the
ground. Look at V4 in the following example
http://riad-kaced-usenet-group.googlegroups.com/web/testbench.png?gsc=zBey_QsAAABOAmZZWQAXCPwVHZkypnaY
That Zero-Volt device would act as a current monitor. Probing this
current and then multiplied by the VDD would give you the power. With
this, you can measure either quiescent, static and dynamic power.

2. Yes, all what you need is to run a DC sweep by varying either
parameters you want.
This is an example I have created a while ago.
http://riad-kaced-usenet-group.googlegroups.com/web/dcSweep.png?gsc=1beo_QsAAAAAsjGvHeCq0DH5PzyjAWb1

If you ask Google for a 'Cadence Spectre Tutorial' then it would bring
very useful stuff for you to start with ...

Cheers,
Riad.

 

[Riad KACED]

Mr Riad

thank you for ur suggestion, i will try and discuss with you.
then one more thing what is gpdk and why we use gpdk.

thanks

Hi USK, gpdk stands for Generic Process Design Kit. the gpdk is a
kindof non-foundry PDK provided by Cadence.
Well, if you do not know what is a PDK, then you may look at my post
in:
http://www.designers-guide.org/Forum/YaBB.pl?num=1256116794/3#3

BTW, please try to stick at the forum as I'm not able to answer
questions by email. Also, I do not know the answer for everything,
that's why I encourage you to use the forum instead.

Cheers,
Riad.