koushikr_in
Member level 2
I am using a Agilent pHEMT (ATF34143) to be used as an amplifier at lower frequencies (1 MHz) and low temperatures (4 Kelvin). When I try to measure to dc characteristics of the transistor I see osciilations (fosc= 160 MHz) at the drain terminal. I use a bias tee (**broken link removed**) between the drain terminal and the supply voltage. Similar bias tee is used between gate and the gate supply.
When the oscillation begin to appear, I see an abrupt jump in the drain current. How can I eliminate these oscillations / make the circuit more stable?
When the oscillation begin to appear, I see an abrupt jump in the drain current. How can I eliminate these oscillations / make the circuit more stable?
