simulate analog signal to digital with FPGA

[javadgodling]

Hi
I write the FFT filter in FPGA and i want simulate it before implement it.
the problem is that We need A2D for digitalize the signal.
how can i simulate this A2D in software?
modelsim is helpful? i think modelsim just simulate digital siganl and can't input analog signal...

thanks

 

[ahmad1954]

you are right. modelsim is only for digital simulation and you should give it data after adc.

 

[FvM]

I think there are no limitations in modelling the ADC behaviour in a digital simulator like Modelsim. You'll input an "analog" stimulus (a real signal) and perform the quantization in your ADC model.

Although it's not the primary application of a digital simulator, you can even model the behaviour of an external analog circuit by describing it in the z-domain (using difference equations).

 

[javadgodling]

I think there are no limitations in modelling the ADC behaviour in a digital simulator like Modelsim. You'll input an "analog" stimulus (a real signal) and perform the quantization in your ADC model.

Although it's not the primary application of a digital simulator, you can even model the behaviour of an external analog circuit by describing it in the z-domain (using difference equations).

I cant undrestad what you seid
you mean I put analog signal in modelsim? how can I explain to modelsim analog signal!!!
and how can I dramatize ADC to modelsim?

 

[FvM]

To give an example, a real number range of 0.0 to 5.0 will be mapped to an integer value of 0 to 1023 to model an (ideal) 10-Bit ADC. That's a simple numeric operation in Modelsim.

 

[ahmad1954]

this link may help you:
https://embdev.net/topic/289493