On Aug 30, 8:21 pm, Riad KACED <riad.ka...@[EMAIL PROTECTED]
> wrote:
> Dear Ankur,
>
> 1. You are designing a Chopper amplifier and a transient simulation is
> not enough to measure the performance of it. You should be interested
> in knowing the transfer function and the noise of this amplifier. But
> how can you do it, at transistor level, for such a non-linear
> circuit ? You need a DC operating point to run small signal AC/Noise
> analyses. But since you've got a switching-mode design, then the idea
> is to determine a steady state and run the AC/Noise analyses about a
> periodic OP point. SpectreRF is capable of this by using tools like
> PSS.
>
> 2. Bit from the Virtuoso Spectre Circuit Simulator RF Analysis Theory
> (You should give a look at this doc, it is in your Cadence tree):
> Periodic Steady-State (PSS) analysis is a large-signal analysis that
> directly computes
> the periodic steady-state response of a circuit with a simulation time
> that is independent of
> the time constants of the circuit. PSS quickly computes the steady-
> state response of circuits
> that exhibit extremely long time constants, such as high-Q filters and
> oscillators.
>
> Cadence has got loads of application notes about using SpectreRF and
> PSS for VCOs, LNAs, Mixers, Power Amplifiers ...etc. It could be very
> useful for you to have a look at those. Since you are designing a
> Chopper Amplifier, I would rather advice the Ken Kundert's 'Simulating
> Switched-Capacitor Filters with SpectreRF' which is the closest to
> your application. You can find this do***ent
in:http://www.designers-guide.org/Analysis/sc-filters.pdf
>
> I used to run SpectreRF/PSS a while back when helping some RFIC
> designers in debugging their simulations. I found a little do***ent on
> the Internet which was very helpful for my oscillator case. It might
> help you as well. Just bear in mind to not tick 'oscillator' when
> running PSS in your
case.http://ocw.mit.edu/NR/rdonlyres/Electrical-Engineering-and-Computer-S...
>
> PSS analysis is very useful in RFIC design, it is quicker and more
> accurate than the transient.
>
> BTW, please give a look at thehttp://www.designers-guide.org/
> do***ents. It's worth posting your question in that DG forum as well.
> You are most likely to find IC design engineers over there.
>
> Hope this help !
> Riad.
Hello Riad,
The post was also helpful for me since I am also trying to simulate
the chopper stabalization schematic.
I went throgh the cadence tutorial..But still I need some help to
simulate the PSd of chopper opamp.
I just want to see the 1/f noise of opamp cancelled after the chopper
stabalization.
Do u have any example for this simulation?
Thanks
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