The Designer's Guide Community Forum

The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl
Design >> Mixed-Signal Design >> Ken Kundert come in, pls
https://designers-guide.org/forum/YaBB.pl?num=1119778754

Message started by dodody on Jun 26^th, 2005, 2:39am

Title: Ken Kundert come in, pls
Post by dodody on Jun 26^th, 2005, 2:39am

Hi Ken Kunder,

I am refering your interesting paper "Device Noise Simulation of Sigma-Delta Modulator". It's really invaluable for me, a designer struggling in SC SDM simulation.

It seems that the whole SDM is simulated by the behavior model (Verilog-A) and the time domain simulation (tran simulation, spectre).
You mentioned that in "3. methodolgy" (p. 4) of this paper and the attached scripts.

Also, you said "the second order converter of Figure 5 was implemented in difference equation form in
Verilog-A and simulated with SpectreRF." (p. 18 ) in your paper.

I just wander that how the whole SDM is simulated with SpecteRF. Could SpecteRF do the tran simulation and simulate SDM (chaotic steady-state)?

Thanks for your kindly help!

Title: Re: Ken Kundert come in, pls
Post by Ken Kundert on Jun 26^th, 2005, 2:54pm

You cannot simulate the whole SDM in SpectreRF because, as you point out, it is chaotic in steady-state, and SpectreRF requires that the behavior be periodic or quasiperiodic. So instead you break it into pieces and characterize each piece with SpectreRF, and then use the result to predict the noise of the whole SDM.

-Ken

Title: Re: Ken Kundert come in, pls
Post by dodody on Jun 27^th, 2005, 9:35pm

thanks.