quick.silver
Newbie level 2
I have tried to built an amplifier with a AT-55143 transistor at 3GHz. I performed all the stability analysis and design the circuit accordingly with DC blocks and DC feedlines. The layout was fabricated and after measurements I found that it was oscillating at 8 GHz. But infact during the stability test I found that it was unconditionally stable beyond 5 GHz (K factor). WHat could be the problem?