How to create an arbitrary wave function as the input stimul

Hello, usually when we run a Spectre simulation, we could use the
standard stimulus such as Vsin, Vpulse etc from the analogLib. What if
I need an arbitrary wave function as the stimulus, for example,
exponentially increased sine wave? I guess this can be done thru CDF.
Is there an easier way? Or are there any 3rd party component lib
available? Thank you for your input!

 

[Svenn Are Bjerkem]

wjcndyd@yahoo.com wrote:

Hello, usually when we run a Spectre simulation, we could use the
standard stimulus such as Vsin, Vpulse etc from the analogLib. What if
I need an arbitrary wave function as the stimulus, for example,
exponentially increased sine wave? I guess this can be done thru CDF.

What do you mean by exponential increased sine wave? What is increasing
exponentially: Amplitude, phase, frequency, something else?

You might want to look at PSS (Periodic Steady State) if your circuit has
non-linear elements in feedback path.

Is there an easier way? Or are there any 3rd party component lib
available? Thank you for your input!

I implemented a sinusoidal source with exponentially increasing frequency in
VHDL-AMS. I guess you can do the same for Verilog-A in spectre.

--
Svenn

 

[S. Badel]

Yu can make a Verilog-A model, or use existing ones.
some libs are shipped with, amopngst which functional and ahdlLib,
which have a number of verilog-A models for free.
these are located in the standard cdslib directory, or in
tools/dfII/samples/
i.e. you can use one exp.source and one sine source and use
a multiplier to produce what you want.

cheers,
stéphane


wjcndyd@yahoo.com wrote:

Hello, usually when we run a Spectre simulation, we could use the
standard stimulus such as Vsin, Vpulse etc from the analogLib. What if
I need an arbitrary wave function as the stimulus, for example,
exponentially increased sine wave? I guess this can be done thru CDF.
Is there an easier way? Or are there any 3rd party component lib
available? Thank you for your input!