ayhz2002
Member level 3

hi:
I'm trying to design an amplifier for maximum gain. The problem is that the amplifier is not stable at the design frequency which is 5.5 GHz. It is only stable from 1.4 to 4.0 GHz. The transistor operates from 100 MHz to 6 GHz.
I managed to stabilize it in the entire range except at low frequency (from 100 to 400 MHz). I designed alot of matching networks and still not stable at low frequencies. I was using resistors to load both the input and output or transmission lines with stubs.
Do you think that the transistor is suitable to be an oscillator or what?
thanks
ayhz2002
I'm trying to design an amplifier for maximum gain. The problem is that the amplifier is not stable at the design frequency which is 5.5 GHz. It is only stable from 1.4 to 4.0 GHz. The transistor operates from 100 MHz to 6 GHz.
I managed to stabilize it in the entire range except at low frequency (from 100 to 400 MHz). I designed alot of matching networks and still not stable at low frequencies. I was using resistors to load both the input and output or transmission lines with stubs.
Do you think that the transistor is suitable to be an oscillator or what?
thanks
ayhz2002