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Simulators >> Circuit Simulators >> simulation on delta sigma ADC
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Message started by min on Jul 31^st, 2007, 12:33am

Title: simulation on delta sigma ADC
Post by min on Jul 31^st, 2007, 12:33am

Hi all :

I am designing a delta-sigma modulator .And i am wondering about its simulation.

As i will simulate 1024 point . If I use the spectre to simulate the data is too large .

Can anyone tell me what simulator I should use . And How i can simulate

Title: Re: simulation on delta sigma ADC
Post by Geoffrey_Coram on Jul 31^st, 2007, 5:19am

What kind of simulation are you trying to do? (transient? don't know what else makes any sense, certainly not pss)

Why would 1024 be too many points for Spectre? What data gets too large? I'm thinking "points" = time points in the transient analysis, you must mean something else because there's no reason Spectre shouldn't be able to handle many more points than that.

Title: Re: simulation on delta sigma ADC
Post by sheldon on Aug 3^rd, 2007, 8:50pm

Min,

Data size should not be a problem when simulating a Delta-Sigma
Modulator with Spectre. However, if you are concerned about the data
size, then you can try the following approaches to reduce data size.

1) Don't save all the voltages and currents points, save only the
voltage that you need for the FFT calculation.

2) Use transient analysis options, strobedelay and strobeperiod,
to only save data at the time points required for the FFT.

I often simulate Sigma-Delta Modulators with 16384 points and
have never had an issue with the output data file size. I use
option #1 so I can compare the results from multiple simulation
runs.

The details of the simulation setup have been discussed in
previous threads, please do a search for the details.

Best Regards,

Sheldon