ZHazami
Newbie level 5
Hello,
We are testing our 1.5 GHz Power amplifier. In our first attempt, we have faced an oscillation. Our transistor is CGHV14240 CREE (wolfspeed). We utilized a resistor in series with DC feed of input and also a resonator at 1.5 GHz in parallel with a resistor. If we measure S parameters of PA, in a range of 1-1.5 GHz we will have S11 higher than 0 dB. The original source of oscillation was determined with the aid of spectrum analyzed which is from 90 to 150 MHz. Thermal instability was inspected using infrared thermal camera. no oscillation due to thermal instability.
Any comments?
We are testing our 1.5 GHz Power amplifier. In our first attempt, we have faced an oscillation. Our transistor is CGHV14240 CREE (wolfspeed). We utilized a resistor in series with DC feed of input and also a resonator at 1.5 GHz in parallel with a resistor. If we measure S parameters of PA, in a range of 1-1.5 GHz we will have S11 higher than 0 dB. The original source of oscillation was determined with the aid of spectrum analyzed which is from 90 to 150 MHz. Thermal instability was inspected using infrared thermal camera. no oscillation due to thermal instability.
Any comments?