Reduction of interchannel interference produced by a power amplifier near 1
-dB compression is a key concern for the wireless communications industry.
In this paper, we present a 100-mW monolithic-microwave integrated-circuit
(MMIC) power amplifier designed using a novel form of the derivative superp
osition method. The measured results of the MMIC power amplifier showed a t
wo-tone carrier-to-interference (C/I) ratio of 45 dBc with an efficiency of
22.5% when backed off by 4.5 dB from the 1-dB compression point. We demons
trate that the MIMIC power amplifier represents a good compromise between C
/I ratio, output power, efficiency, and gain at the cost of an increase in
total gate width, by comparing it to class-A, class-AB, and class-B single
field-effect-transistor amplifiers.