icdesign
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Hi Eugene,
Thanks very much for your kindly support. I have two symbols on the schematic: test1 drives test2. The Verilog-A code are below. With noise simulation, I can see the output node of the test1 (noise voltage over the frequency). I expect the test2 is the Z-transform (1-z^-1)^2, which can shaped the noise over the frequency. However, the output of the test2 is 0 over the frequency.
I appreciate your help very much.
module test1 (vout); output vout; electrical vout; analog begin V(vout) <+ noise_table({1,0.083, 100M, 0.083}); end endmodule
**
module test2 (in, out); electrical in, out; parameter real T = 50n;
analog begin V(out) <+ zi_nd(V(in), {1,-2,1}, {1,0}, T); end endmodule
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