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Simulators >> RF Simulators >> Comparator ISF using PSS/PAC
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Message started by kerekuto on Mar 20^th, 2013, 5:25pm

Title: Comparator ISF using PSS/PAC
Post by kerekuto on Mar 20^th, 2013, 5:25pm

Hi, I am trying to simulate the Impulse Sensitivity Function (ISF) of a clocked comparator using SpectreRF as in Kim's paper "Impulse Sensitivity Function Analysis of Periodic Circuits". I’ve already obtained the ISF using the transient-based method, but I would like to compare performance and results. I am not very familiar with PSS or PAC, and all the information I've found in other forums is more geared towards oscillators.

Does anybody know about a good tutorial, or better yet, has anybody tried to reproduce this method?

(Link to the paper: http://www.cecs.uci.edu/~papers/iccad08/PDFs/Papers/05C.2.pdf)

Title: Re: Comparator ISF using PSS/PAC
Post by PinGuine on Mar 26^th, 2013, 1:43pm

Hi
i have simulated ISF using PAC. But special script was needed after simulation to implement approach from paper.
if ISF value at one time point is interested then You can
1. Add strobe component in the testbench. Which will strobe output at interested time.
2.Run PAC.
3. Integrate "sideband 0" from 0hz to Fclock/2. It gives ISF value

Title: Re: Comparator ISF using PSS/PAC
Post by kerekuto on Apr 3^rd, 2013, 2:25pm

Hi PinGuine, thank you for your reply. By strobe component, are you referring to the clock signal (vpulse source)? The other sources I have are only DC sources: VDD, VCM to bias the inputs, and a dc voltage between the inputs to cancel input offset, is this setup correct?

For the PAC analysis, on which source should I apply the PAC magnitude of 1?

Can you give me more details on how to do the integration you mentioned on step 3?

Title: Re: Comparator ISF using PSS/PAC
Post by 880321 on May 8^th, 2013, 12:13am

PinGuine wrote on Mar 26^th, 2013, 1:43pm:

hello,you say spercial script was needed for PAC to get ISF, can you post your script here?

Title: Re: Comparator ISF using PSS/PAC
Post by Achal Kathuria on Sep 23^rd, 2013, 6:08pm

@kerekuto - the slide 20 of the classnotes on dynamic comparators here https://bspace.berkeley.edu/access/content/group/814408c5-19c5-454c-ab95-454a58b9362d/Lectures/T15_sss.pdf illustrates the idea of strobing the output at fixed time (t_sub_0 in the paper) after the edge of the clock (that sets the frequency to W_sub_c).

and as per my understanding the pac input of magnitude 1 will have to applied at the input of the your clocked comparator.

Title: Re: Comparator ISF using PSS/PAC
Post by phlan on Jun 30^th, 2017, 5:54pm

Hi achalk,

the webwite is not available anymore until Jun. 17, 2017. Would you please guide me where can I find the related materials? Appreciate your great helps.

phlan

Title: Re: Comparator ISF using PSS/PAC
Post by sheldon on Sep 22^nd, 2017, 4:00pm

If you have access to the IEEEXplore, you can probably still find the
paper.

Be aware that the measurement is non-trivial even in simulation. There
are simpler methods based on frequency domain simulations.