sharethewell
Member level 5
I am designing a class E power amplifier working at 433MHz. It is a nonlinear power amplifier since the transistor works in nonlinear region (cutoff and triode).
I used ZM1 of SP analysis in Cadence to measure the input impedance of the PA and I got a negative value for real part. Is it normal for a nonlinear PA? Does it mean it's oscillating? I checked waveforms of all nodes and didn't see any oscillation. Don't know why.
I used ZM1 of SP analysis in Cadence to measure the input impedance of the PA and I got a negative value for real part. Is it normal for a nonlinear PA? Does it mean it's oscillating? I checked waveforms of all nodes and didn't see any oscillation. Don't know why.