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hello i am working on a PA and tried to figure out how the portAdapter works in loadpull simulation. There is an example in rfExamples library and PA application note says the portAdapter does the loadpull simulation. i want to find out how the parameters of the portAdapter relate each other. For example, how those phase of gamma and mag of gamma produce capacitance, inductance and resistance values. It will be very much appreciated if anyone can help on this. thanks.
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Hi, I need to measure phase noise of the non-autonomous circuit - VCDL (voltage controlled delay line) with spectreRF. How should I do that? I have some results but I'm not sure if they are trustworthy - I measured the phase noise using two methods but the results are completely different. Let's say that I'm using following configuration for spectre simulation: pssout ( ) pss fund=0.45G harms=10 errpreset="moderate" tstab=200n maxstep=50ps pnoiseout (out gnd) pnoise sweeptype="relative" relharmnum=1 start=100 stop=100M dec=5 maxsideband=21 +noisetype="sources" Is this ok? My main concern is the pnoiseout simulation and its noisetype parameter. Is this ok to use noisetype="sources"? Or maybe I should use "timedomain"? When the simulation is finished I get results in V/sqrt(Hz) units. Is this enough to convert such result to dB20? Or maybe there is a need for different conversions/computations? Should I take into account the shape of the signal? (divide by slew rate or something like that). If yes, there is another problem, the signal shape changes in the circuit -> The circuit input is rail to rail clock signal. Inside the VCDL the signal's amplitude is limited and signal is less square like. Then signal is buffered so the output of VCDL is again rail to rail square signal. Thanks in advance for any advice. Regards, Bart
Hi all, I was wondering if anyone had had any success or could suggest a method for using SpectreRF to derive a frequency response for a PLL? What I want is a loop (open and closed) gain versus frequency plot. Cheers Reuben