fast linc2
Thanks RF-OM.
The two pictures are in false sequence. The upper one(8V) is the output and lower one(3.6V) is input.
second the waveforms are simulated by ADS, not measurement. In ADS, the voltage swing of any wire can be obtained directly, the current swing can be obtained by insert a I_Probe.
how do you mean add resistor at amplifier output? My output of third stage amplifier is 50Ohm. I find from Cripps's book, adding a resistive attenuator of 1 to 3 dB in the interstage matching can stabilize the circuit. After insert this resistor, the K-factor of my output stage becomes larger than 1.
I do not know how to measure the stability factor of the second stage.