Due to the availability of decent surplus amplifiers for 3.4Ghz there was the need to
develop a preamp to get a balance in the rx budget again.
Simulation results:
Fig.1: S21&S11 simulated 14dB gain & -11dB stub at 2.3 GHz
Fig.2: simulated noise figure
Fig.3: stability factor K, well above 1 for all frequencies, the key are series resonance cricuits for 3.4GHz in
the biasing lines plus the resistive loading in the gate and drain to terminate all out of band frequencies
Layout:
Fig.4: Layout
Measurements:
preamp is stable; F=0.6dB Gain=17dB (tnx DL4DTU)
Photo:
