You could use the multiplier from the ahdlLib for this purpose. Simply connect the noise source to one input terminal and a voltage- or current-controlled voltage source that senses the desired quantity to the other. You might want to modify the multiplier code in order to obain a floating noise voltage or a noise current at the output.

Hi Jess,

You might be able to do it with a combination of vsource and bsource? (I've not tried, but it _ought_ to work).

Or you could use Verilog-A - but then you know that  ;D

Andrew.

Jess,

By bsource, I mean spectre's Behavioural source component, which was released (officially) in IC5033. It's there in some earlier subversions, but is hidden from spectre -h.

It can be used to model arbitrary expressions of voltage and current of other signals, so in this respect it is more flexible than a polynomial controlled source (which might be what you're referring to?).

See "spectre -h bsource" for more details.

In practice it uses Verilog-A internally, but uses the compiled Verilog-A mode which is coming fully in IC5141 (where Verilog-A compiles to a shared library). So the performance is pretty good! And for simple complex expressions (if you get my oxymoron) it's a handy way of implementing things without the need to go as far as using Verilog-A.

Here's some examples from the help:

Code:

 Voltage and Current (Sinewave) Source
	   vsrc (n1 n2) bsource v=10.0*sin(2*pi*freq*$time)
	   isrc (n1 n2) bsource i=1.0e-3*sin(2*pi*freq*$time)

 Current controlled current source
	   vsrc (n1 n2) vsource v=10
	   cccs1 (n3 n4) bsource i=gain*i("vsrc:0")

 Current controlled voltage source
	   vsrc (n1 n2) vsource v=10
	   ccvs1 (n3 n4) bsource v=100*i("vsrc:0")

 Voltage controlled voltage source
	   vsrc (n1 n2) resistor r=100k
	   vcvs1 (n3 n4) bsource v=gain*v(n1,n2)
 

You can have the bsource represent resistors, capacitors, inductors as well.

Cheers,

Andrew.