hrkhari
Junior Member
Offline
Posts: 21
|
Thx svensi
I have a problem in the setup of the PSS analysis of the designed -gm differential oscillator, I'm using a damped vsin source at the Vdd to start up the ckt, with a freq of 3.5G, amplitude 1mV and 50M of damping factor. Then I terminate the ac coupled differential output by 50ohms port, respectively. The first question is do I have to convert the ac coupled differential output to single ended output using a balun, prior to 50ohms termination, for simulation prupose?. The second question is, when I use the damped vsin source as a start-up, PSS form setup does not finalize, stating a form error:
Periodic Steady State: Fundamental Tone 1 has a blank name For each tone that is not "Small" signal and has a SrcId listed, the schematic instance (SrcId) must have a name entered under the appropriate frequency name property. Please edit the top level schematic to assign these names, save the schematic and then click the "Update From Schematic" button on the analysis form.
This problem does not occur if I setup the PSS and then insert the start-up source to execute the simulation. Please advise
Rgds
|