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Design Languages >> Verilog-AMS >> 2 way switch in verilog ams
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Message started by Yuan on Feb 6^th, 2019, 10:01pm

Title: 2 way switch in verilog ams
Post by Yuan on Feb 6^th, 2019, 10:01pm

I was trying to make a 2 branches switch between Vdd and ground, which controlled by a logic signal. Below is my code:

module dg_switch2(p, n, g, s);
input s;
output p, n, g;
logic s;
electrical p, n, g;

analog begin
if (s) begin
I(p, n) <+ 0.0;
V(g, n) <+ 0.0;
end
else begin
V(p, n) <+ 0.0;
I(g, n) <+ 0.0
end
end
endmodule

The problem is that when I connect a Vdc to port'p' and ground to port 'n', cadence report an error says that my there is a short circuit at my Vdc. It seems that I cannot connect both the voltage source and ground to my switch. What should I do fixed the error?

Title: Re: 2 way switch in verilog ams
Post by Geoffrey_Coram on Feb 7^th, 2019, 8:28am

You should add some resistance.

What do you expect to happen when the switch is closed, V(p,n) <+ 0, and the voltage source Vdc is not zero?