Periodic integration in Calculator

[ShamShoon]

I am using Analog Design Environment and I have Spectre simulation
results of a sequence of random input patterns applied to a circuit on
each clock. What I would like to do is to find the integral of the
output waveform over each clock cycle period independently. Using the
"integ" function in Calculator only lets me specify the starting and
ending point of integration which means it will give me the result for
only one particular period and that I have to change the ranges
manually to get the integral over each period. What I would like to do
is to automatically calculate the integral over multiple time ranges
that are basically offset from each other by the length of the clock
cycle period. Is there anyway that I can do that with the calculator?
Is it possible to have a variable defined as a range and then enter
something like From: x To: x+T in the integral function dialog box,
where T is the clock period?

I appreciate any help.

Thanks.

 

[fogh]

ShamShoon wrote:

I am using Analog Design Environment and I have Spectre simulation
results of a sequence of random input patterns applied to a circuit on
each clock. What I would like to do is to find the integral of the
output waveform over each clock cycle period independently. Using the
"integ" function in Calculator only lets me specify the starting and
ending point of integration which means it will give me the result for
only one particular period and that I have to change the ranges
manually to get the integral over each period. What I would like to do
is to automatically calculate the integral over multiple time ranges
that are basically offset from each other by the length of the clock
cycle period. Is there anyway that I can do that with the calculator?
Is it possible to have a variable defined as a range and then enter
something like From: x To: x+T in the integral function dialog box,
where T is the clock period?

It is possible to define your own calculator functions (one of the last
chapters in the analog artist manual). So what you describe is doable.
But if your simulation can be rerun in a reasonable time, I believe it
will be more convenient to do this postprocessing in circuit (as
schematic or verilogA view). A controlled source and a capacitor to
integrate, some switch to discharge on clock posedge, and you are done.

 

If the clock period is static, then I would write a SpectreHDL or a
Verilog-A module to perform the integral and print the result to a file
for each period. The static clock period would then be a parameter on
the symbol of the integrator. Depends a bit on how you want to present
your data. Postprocessing in ADE can become slow if data is large. If
you write the integral of each period to file, you can choose the
format of your favourite graph generator.
--
Svenn