[Moved]: Cadence: How to Add Noise in ECG waveform

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simplsoft

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I am working on a project to design filter circuit for ECG detection system. I have generated ECG waveforms through cadence using VPWLF/PWL file. But I also want to add noise to my ECG waveform, and I am stuck at how to add NOISE of 400 Hz to my ECG signal using cadence which will be the input for filter design.

I am stuck at this point, any help in this matter will be highly appreciated.

Thanks & Regards.
 

What about adding an ac voltage source of 400Hz with a small amplitude? It's not just noise, but it mimics 400Hz EMI .
 

That's how I've approached things, sometimes with a
plurality of different-frequency vsin sources stacked
to get a more chaotic appearing stimulus.

Another option chaos-wise is to use a vpwlfile that
you gen'd up using some sort of random number
stream.
 

You can use the $random() function of Verilog-a to generate some random numbers and use these numbers as the amplitude of a sine with the desired frequency. For example, ($random() % 100 ) / 100 produces a random number between 0 to 1. You can easily use the schematic from this Verilog-a code inside your top-level schematic.
 

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