The Designer's Guide Community
Forum
Welcome, Guest. Please Login or Register. Please follow the Forum guidelines.
Mar 29th, 2024, 7:10am
Pages: 1
Send Topic Print
Sentaurus AC Simulations (Read 2568 times)
Dinis Cheian
New Member
*
Offline



Posts: 1

Sentaurus AC Simulations
Mar 14th, 2016, 7:36pm
 
Hi,

I am using Sentaurus to perform a simple AC simulation on a PN junction. I have an Anode terminal and a Cathode terminal and I am interested in obtaining I(Cathode)/V(Cathode) as a function of frequency in order to find the 3dB bandwidth.
The simulation seems to converge but the parameters that it spits out is are a(1,1) and c(1,1) which is are defined as:
I=A*V+i*omega*C*V
where:
I- small signal current
V- small signal voltage
omega - 2pi * (operating frequency)
i - imaginary unit
So it looks like if I do sqrt(a^2+(2pi * (operating frequency) * c)^2) this should be I/V as a function of frequency. However what I get is a function increasing with frequency that looks nothing like a single pole system.
Does anyone know how to solve the problem?
I've already tried:
1. Using simple transient simulation to find the bandwidth (that works but I want the AC simulations).
2. Tried to use the RF library in SVisual to extract the Y matrix but that library only works for 2 ports i.e. 3 terminal devices.

Any help would be greatly appreciated.

Thanks,
Dinis
Back to top
 
 
View Profile   IP Logged
ULPAnalog
Community Member
***
Offline



Posts: 97

Re: Sentaurus AC Simulations
Reply #1 - Mar 14th, 2016, 9:54pm
 
Hello

It looks to me as if you are looking at the junction capacitance in your analysis. For a capacitor I = jwCV, with all the symbols carrying their usual meaning. And indeed the current increases with frequency (true for a RC load). You might want to revisit what you would like to define as -3dB bandwidth.
Back to top
 
 
View Profile   IP Logged
Pages: 1
Send Topic Print
Copyright 2002-2024 Designer’s Guide Consulting, Inc. Designer’s Guide® is a registered trademark of Designer’s Guide Consulting, Inc. All rights reserved. Send comments or questions to editor@designers-guide.org. Consider submitting a paper or model.