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Transient noise simulations (Read 4138 times)

currant Junior Member Offline Posts: 31	Transient noise simulations Oct 28^th, 2009, 6:39am Hello, We use spectre transient noise analysis and we get from it very strange results. Device - BandPass SigmaDelta ADC. It is very unexpectedly for us, that if we increase noisefmax, we get a better SNR. Did anybody have a same problem or have an explanation of that behavioral? Many Thanks.
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Riad KACED

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Posts: 93
Swindon, UK

Re: Transient noise simulations
Reply #1 - Nov 9^th, 2009, 12:51pm

Hi Currant,

You better report your problem to your simulator vendor, i.e. cadence if Spectre. The noisefmax is directly linked to the simulation time step (The maximum time step of the transient analysis is limited to 1/noisefmax). Though I don't see why increasing noisefmax would decrease the noise power, i.e. increase the SNR.

Berkeley Design Automation have issued a WP where they give some recommendation for noisefmax/tstep/tstop versus ADC's input frequency and clock frequency. You can check out the paper at http://www.berkeley-da.com/prod/datasheets/Berkeley_DA_Noise_Analisys_Analog_RF_...

Cheers,
Riad.

Riad KACED
PDK, EDA Support Engineer.

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