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Design Languages >> Verilog-AMS >> complex signal processing
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Message started by svensl on Aug 26^th, 2005, 1:42am

Title: complex signal processing
Post by svensl on Aug 26^th, 2005, 1:42am

Hello All,
I was wondering whether if it is possible to do complex signal processing in VerilogA/MS. The manual does not say anything about it. I tried using “zi_np” and defining complex poles and zeros, but VerilogA/MS told me that I need to have complex conjugate zeros and poles. Furthermore, can I define complex voltages such as V=a+j*b in VerilogA/MS?

If so, can someone please comment on this?
Any feedback is appreciated.

Title: Re: complex signal processing
Post by Geoffrey_Coram on Aug 26^th, 2005, 4:35am

svensl -
You can't define complex voltages such as V=a+j*b in VerilogA/MS. There was some talk about adding complex support as an extension to better support RF, but this effort fizzled out.

zi_np's third argument, according to the LRM, is a vector of N pairs of real numbers, where the first number if the real part and the second the imaginary part. If you put a non-zero imaginary part, then you have to put in the complex conjugate yourself (same real part, -imaginary part). (One might argue that the simulator should add this in for you ... )

I've had some difficulties with simulators not really agreeing on what a "vector" is in some cases -- I was trying to use noise_table, and I wasn't able to use an array
int noisevals[10];
I had to use a comma-separated list of numbers enclosed in braces {}, and the numbers had to be constants (fixed numbers, or I think I was able to use parameters).