DC sweep and transient at same time

Atul,

It's just putting the sweep in the right place:

analysisDCswp1 sweep param=dc dev=Vg start=1 stop=20 step=1 {
  doTran tran stop=180us
}

saveOptions options save=allpub

simulator lang=spice
.measure tran t1 when V(x)=3 cross=2
.measure tran t2 when V(x)=3 cross=4
.measure tran freq param '1/(t2-t1)'

Andrew

Thanks a lot, Sir. It worked 

I used this way to calculate frequency because oscillation was crossing 3 every time.( First calculating t1 , t2 and then frequency)

Is there any better alternative??

Seems reasonable - it probably depends on what your expected threshold voltage would be in whatever the oscillator is driving.

Andrew

Thanks, sir for helping me out. When I vary Vg, some of the Vg frequency is coming to NaN. The reason for that can be that for different Vg, crossing value changes and so I have to change accordingly. How will I implement this in Verilog A? Please help me out.

Thanks, sir for helping me out. When I vary Vg, some of the Vg frequency is coming to NaN. The reason for that can be that for different Vg, crossing value changes and so I have to change accordingly. How will I implement this in Verilog A? Please help me out.

I don't really see what Verilog-A has to do with altering a .measure statement. I'm not sure what you're varying (maybe it's different from the original example above) or how you determine the threshold - the threshold in the .measure statements could be another node voltage in the design, so if you can arrange to have a voltage source in the circuit that also changes you could use that.

Andrew