Hi alltogether,

I measured the output frequency of a VCO, and plotted it against the control

voltage.

Now I want to determine the steepness (Kvco).

Does anyone know how to do this with the Cadence calculator ?

A simple deriv(waveform) produces something that really doesn't look like

the thing I'm searching for ....

Thanks a lot,

Stefan Joeres

Well, deriv should be OK. May be a bit noisy, because it's using just the points

which came out of the simulator.

You could always write a verilog-A model to do the derivative using ddt().

Are you measuring the frequency of the VCO with Verilog-A? (the benefit of

doing it with verilog-a is that the crossing points are controlled, and so you

don't get jitter from numerical interpolation). There's a component, freq_meter,

in ahdlLib.

Andrew.

On Tue, 2 Mar 2004 14:11:34 +0100, "Stefan Joeres"

which came out of the simulator.

You could always write a verilog-A model to do the derivative using ddt().

Are you measuring the frequency of the VCO with Verilog-A? (the benefit of

doing it with verilog-a is that the crossing points are controlled, and so you

don't get jitter from numerical interpolation). There's a component, freq_meter,

in ahdlLib.

Andrew.

On Tue, 2 Mar 2004 14:11:34 +0100, "Stefan Joeres"

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