Hi,
I am designing a -ive resistance oscillator. When I do a HB analysis and view the output it shows the perfect frequency(4.25 GHz) with sufficent power.
Also I checked with the "osctest" port the loop gain is greater than one at the oscillating freqeuncy and the Nyquist plot also encircles 1+j*0.
But when I try to do a transient analysis there is no oscillation build-up. I tried to have an intial condition set in the transient analysis even then there is no build up.
Can anyone direct me on what might be the problem?
The resonant element is a hair-pin filter.
Thanks in advance.
Regards,
Prakash
I am designing a -ive resistance oscillator. When I do a HB analysis and view the output it shows the perfect frequency(4.25 GHz) with sufficent power.
Also I checked with the "osctest" port the loop gain is greater than one at the oscillating freqeuncy and the Nyquist plot also encircles 1+j*0.
But when I try to do a transient analysis there is no oscillation build-up. I tried to have an intial condition set in the transient analysis even then there is no build up.
Can anyone direct me on what might be the problem?
The resonant element is a hair-pin filter.
Thanks in advance.
Regards,
Prakash
However if you have a High Q oscillator this will be of little help depending on the amount of memory and system resources you have. If that is the case and you still want to see your Oscillator startup then Circuit Envelope would be the better simulator.