Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

[SOLVED] [Spectre calculator] How to calculate input capacitance of a 2 ports network.

Status
Not open for further replies.
K

ktx2222

Member level 5
Joined
Jan 8, 2014
Messages
81
Helped
2
Reputation
4
Reaction score
2
Trophy points
8
Activity points
613
Hi everyone,

I am a newbie in Cadence spectre simulator. I have a 2 ports network and I try to plot the input equivalent capacitance vs. frequency. In ADS I use equation: Cin = imag(Y11)/2/pi/freq. But I don't know how to insert that equation into Cadence. I only used a basic SP analysis. I have read many thread but I cannot find the answer.

Please give me a detail instruction. I really appreciate your advice.

2014-07-22 10-31-08 AM.png
 

Hi, i usually measure cap with ac analysis in cadence, but your way is also working :)

So, i've created cellview:

test.png


ADE window -> Tools -> Calculator

Code: 
value(imag(ypm('sp 1 1)) VAR("Freq")   )/(twoPi*VAR("Freq"))

You can place just freq value instead of VAR("Freq").

That's my result:
Code: 
1.001E-12
 
Hi Sarge,

Thank for your help. Now I can get the discrete value.

Anyway, I have one more question: Can I do it with a range of frequency? Because I think most of circuit has the input capacitance depends on frequency. So I want to plot the Cin in a range of frequency.
 
if you want to plot frequency dependence of it in sp:
Code: 
imag(ypm('sp 1 1))/(xval(imag(ypm('sp 1 1))) * twoPi )
 
Thank you so much, sarge! It really help me.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top