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error when adding 2 variables (Read 2161 times)

Pavel

Senior Member

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Posts: 174
Lausanne/Switzerland

error when adding 2 variables
Apr 17^th, 2007, 12:29am

Hello,

When modelizing fully differential OTA I've met strange error from veriloga parser.

Here are 2 variables that modelize output small-signal behavior

Code:

	V1P_AC = Gain_AC * laplace_nd(vin_dif, �zeros, poles);
	V1N_AC = Gain_AC * laplace_nd(-vin_dif, zeros, poles);

and here is common mode processing

Code:

V1_CM �= Gain_CM * laplace_nd(V(Vbpfb), zeros, poles);

Then I add common-mode part with small signal part to form outputs:

Code:

	V1P = V1P_AC + V1_CM;
	V1N = V1N_AC + V1_CM;

When I compile this code, following error appears:
Error: dynamic quantities must be directly accessible to the outputs.

What does this error mean?

Regards

Pavel.

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Pavel

Senior Member

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Posts: 174
Lausanne/Switzerland

Re: error when adding 2 variables
Reply #1 - Apr 17^th, 2007, 12:40am

Sorry, the error message concerns portion of code that follows:

Code:

// Slew-Rate processing
	@(above(SLEW_RATE - ddt(V1P))) slew_rate_P = 0;
	@(above(SLEW_RATE - ddt(V1N))) slew_rate_N = 0;

	@(above(-SLEW_RATE + ddt(V1P))) begin
		slew_rate_P = 1;
		i_max_P = I(OutP);
	end

	@(above(-SLEW_RATE + ddt(V1N))) begin
		slew_rate_N = 1;
		i_max_N = I(OutN);
	end

Regards

Pavel

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Pavel Senior Member Offline Posts: 174 Lausanne/Switzerland	Re: error when adding 2 variables Reply #2 - Apr 17^th, 2007, 1:04am Resolved - for slew rate processing I employed slew function. Regards Pavel
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