cadence timing waveform

[parminder]

hi,

suppose Ton of waveform is 2ns and toff= 8ns, i have given transient time of 40ns
i want only 2 initial cycles ( upto 20ns) and rest waveform to be zero. how to do it in cadance?








THANKS

 

[jjx]

Use the the pwl in analogLib. Set the required number of points and build your special waveform.
(0,0) (0.1n,1) (2n,1) (2.1n,0) (10n,0) (10.1n,1), (12n,1), (12.1n,0), (40n, 0)

Or use two regular vpulses and multiply (ahdlLib) the outputs as if they were windowing functions.

 

[parminder]

@jjx Thank you so much for the response,
the first one Vpwl is working fine and it gives triangular waveform. what if i want square waveform ( as pink color square waveform shown in image ).

 

[electronics_rama]

@jjx Thank you so much for the response,
the first one Vpwl is working fine and it gives triangular waveform. what if i want square waveform ( as pink color square waveform shown in image ).

Use "vpulse" source from the analogLib to get the square waveform.

 

[parminder]

Use "vpulse" source from the analogLib to get the square waveform.

then how to get specified number of cycles. suppose i only want 2 cycles out of 5 cycles to be high

 

[electronics_rama]

then how to get specified number of cycles. suppose i only want 2 cycles out of 5 cycles to be high

If you want a custom vpulse waveform, you can write a simple verilog code and use the output waveform as a VCD in your simulations.