(Nov 20 2012)

ATF33143. There is an RC link 10 pF/100 ohms from drain to the source ground plane. The output is routed from the drain through a small ferrite tube that adds a resistive loss of 3 ohms on 144 MHz and 11 ohms on 1296 MHz. This amplifier is not neutralized.

The drain voltage is set with a potentiometer followed by an emitter follower to 1.51 V. The source resistance is set to 13.4 ohms with another potentiometer which gives a current of 35 mA through the transistor.

ATF33143. Input impedance and forward gain.

ATF33143. Output impedance and reverse isolation.