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nus_lin

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Posts: 48

use of small signal resources is not supported?
Sep 09^th, 2008, 5:16am

hi, guys. i copied almost the same code from "the designer's guide to verilog-ams", by Ken. Kundert, our "god father". but unfortunately i got this error message: "use of small signal resources is not supported?" the code is given below:

`include "constants.vams"
`include "disciplines.vams"

module resport(p,n);
parameter real r=1 from (0:inf);
parameter real dc=0;
parameter real mag=1;
inout p,n;
electrical p,n;

analog begin
V(p,n)<+r*I(p,n)+2*dc;
V(p,n)<+2*ac_stim("ac",mag,0);
V(p,n)<+white_noise(4*`P_K*$temperature,"thermal");
end
endmodule

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Geoffrey_Coram

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Posts: 1999
Massachusetts, USA

Re: use of small signal resources is not supported?
Reply #1 - Sep 9^th, 2008, 5:32am

What simulator is that? small-signal sources (ac_stim, white_noise) are pretty basic to any Spice-like simulator, so I'm surprised there's one that supports Verilog-A but not these.

Of course, if you're using a timing (aka fast-spice) simulator, it probably only supports transient analysis, no small-signal.

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nus_lin Community Member Offline Posts: 48	Re: use of small signal resources is not supported? Reply #2 - Sep 9^th, 2008, 5:59am thank you for the reply. i used the cadence design kits for AMS0.35.
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nus_lin Community Member Offline Posts: 48	Re: use of small signal resources is not supported? Reply #3 - Sep 9^th, 2008, 6:02am Error found by spectre during SpectreHDL compile. file: *********** nonrecoverable error: use of small signal resources is not supported Exiting AHDL compilation.
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Ken Kundert Global Moderator Offline Posts: 2386 Silicon Valley	Re: use of small signal resources is not supported? Reply #4 - Sep 9^th, 2008, 10:28am It's odd that the error message says "SpectreHDL". Are you sure you are including it as a verilog-A file? -Ken
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nus_lin Community Member Offline Posts: 48	Re: use of small signal resources is not supported? Reply #5 - Sep 10^th, 2008, 12:19am hi, god father, i have no idea about spectraHDL, but i found a way to solve the "small signal resources" problem. by changing V(p,n)<+2ac_stim("ac",mag,0); to V(p,n)<+ac_stim("ac",2mag,0);
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