How do you guys measure duty cycles in awd or wavescan?

[Svenn Are Bjerkem]

Hi group,

how are you guys measuring your duty-cycle in analog simulations in
IC5.1? Awd does not provide a function, Wavescan has one only in the
MDL mode, and neither here nor at designers-guide nor at cdnusers nor
at sourcelink I could find more info. Maybe I am missing something
here, but I would like to measure the duty-cycles in a signal over a
range in a transient simulation. A little SKILL script (plug-in) for
the calculator would be the result.

--
Svenn

 

[Svenn Are Bjerkem]

On May 4, 11:38 am, Svenn Are Bjerkem <svenn.bjer...@googlemail.com>
wrote:

Hi group,

how are you guys measuring your duty-cycle in analog simulations in
IC5.1? Awd does not provide a function, Wavescan has one only in the
MDL mode, and neither here nor at designers-guide nor at cdnusers nor
at sourcelink I could find more info. Maybe I am missing something
here, but I would like to measure the duty-cycles in a signal over a
range in a transient simulation. A little SKILL script (plug-in) for
the calculator would be the result.

This time I thought I should keep it simple and look around in the
cadence verilog-a code. And I found a little module in bmslib called
MeasDuty. This module has an output which is a waveform containing the
duty-cycle of the measured signal. Ok to use as long as I have the
possibility to instantiate measurement elements into my netlist, but
it is a bit annoying to have to resimulate to see impacts of instance
adjustments. I think a bit of SKILL will be needed sooner or later.
--
Svenn

 

[Roger Light]

Svenn Are Bjerkem wrote:

Hi group,

how are you guys measuring your duty-cycle in analog simulations in
IC5.1? Awd does not provide a function, Wavescan has one only in the
MDL mode, and neither here nor at designers-guide nor at cdnusers nor
at sourcelink I could find more info. Maybe I am missing something
here, but I would like to measure the duty-cycles in a signal over a
range in a transient simulation. A little SKILL script (plug-in) for
the calculator would be the result.

You might be able to adapt the code that Andrew posted for plotting
instantaneous frequency. It'd certainly be a good place to start looking
for ideas anyway.

The code is in this post

http://groups.google.co.uk/group/comp.cad.cadence/msg/a2cd0cbdafa49574

Or else try searching for abInstFreq.il

Cheers,

Roger

 

[Scott Flinchbaugh]

Svenn,

The SpectreMDL user guide and reference covers this function in
Appendix A.

Search under dutycycle or dutycycles depending on your need.

Thanks,
-scott F.

On May 4, 6:30 am, Svenn Are Bjerkem <svenn.bjer...@googlemail.com>
wrote:

On May 4, 11:38 am, Svenn Are Bjerkem <svenn.bjer...@googlemail.com
wrote:

Hi group,

how are you guys measuring your duty-cycle in analog simulations in
IC5.1? Awd does not provide a function, Wavescan has one only in the
MDL mode, and neither here nor at designers-guide nor at cdnusers nor
at sourcelink I could find more info. Maybe I am missing something
here, but I would like to measure the duty-cycles in a signal over a
range in a transient simulation. A little SKILL script (plug-in) for
the calculator would be the result.

This time I thought I should keep it simple and look around in the
cadence verilog-a code. And I found a little module in bmslib called
MeasDuty. This module has an output which is a waveform containing the
duty-cycle of the measured signal. Ok to use as long as I have the
possibility to instantiate measurement elements into my netlist, but
it is a bit annoying to have to resimulate to see impacts of instance
adjustments. I think a bit of SKILL will be needed sooner or later.
--
Svenn