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Output for a pulse is just a DC voltage. Help! (Read 2126 times)

Rosh

Junior Member

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Posts: 21

Output for a pulse is just a DC voltage. Help!
Jan 28^th, 2016, 7:02pm

Hello everyone,

Here is my code :

Code:

`include "disciplines.vams"

module allo(out);
parameter real td = 10n; � �
parameter real tt = 10n;
parameter real t1 = 0n;

 � output out;
 � voltage �out;
 � real Vout, tend;

analog begin

	@ (initial_step) begin
		 Vout = 0;

		 tend = $abstime + td; //return simulation time + td;
	 �end

	 �@(timer(tend))
		 Vout = 1.8;
		 V(out) <+ transition(Vout,0, td, tt);
	 � end


endmodule

I expect to get a pulse with a finite rise and fall time. Instead i get this:

Screen.JPG

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deltasigmaADC Junior Member Offline Posts: 10	Re: Output for a pulse is just a DC voltage. Help! Reply #1 - Jan 29^th, 2016, 2:58am Your variable Vout is always assigned to 1.8. So you should be getting a DC at output, which is what you are seeing. Probably you wanted to update the variable to 0 at some point in time as well. Cheers
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Geoffrey_Coram

Senior Fellow

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Posts: 1998
Massachusetts, USA

Re: Output for a pulse is just a DC voltage. Help!
Reply #2 - Jan 29^th, 2016, 10:55am

Your indentation is confusing; it looks like the V(out) <+ transition is inside the @timer block.

Code:

analog begin
 � �@ (initial_step) begin
	 �Vout = 0;
	 �tend = $abstime + td; //return simulation time + td;
 � �end

 � �@(timer(tend)) begin
	 �Vout = 1.8;
 � �end

 � �V(out) <+ transition(Vout,0, td, tt);

end

If at first you do succeed, STOP, raise your standards, and stop wasting your time.

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