An MMAC C-band FET feedback power amplifier

A feedback power amplifier using miniaturized microwave active circuit (MMAC) technology was developed for satellite C-band applications. This design demonstrates that a strong negative feedback can be implemented in the microwave frequencies to improve amplifier linearity and output power over a 750 MHz bandwidth. The amplifier provides a third-order intermodulation distortion improvement of 7 to 9 dB across the band at backoff, compared to results obtained using the conventional approach without feedback. The theory, proof-of-concept experiment, design, and MMAC implementation of the feedback amplifier are presented.<
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