A high-efficiency single-supply RFIC PHS linear power amplifier with low adjacent channel power leakage

We present the results and simulation for two 1.9 GHz GaAs RFIC power amplifiers. Operated from a single 3.0 V supply at a power added efficiency of 40%, these RFIC's produce +25 and +27 dBm output power, respectively, at -57 dBc adjacent channel power from a 384 kbps /spl pi//4-DQPSK modulated carrier at 600 kHz offset. When operating in a saturated mode the same RFIC's have an output power greater than 26.5 and 28 dBm respectively at over 45% PAE which makes them very attractive for the saturated output applications. We believe this is the best performance reported to date for PHS/PACS mode operation using a single supply RFIC monolithic power amplifier. The design technique, including simulation of spectral regrowth based on AM-AM and AM-PM characteristics, are presented for these amplifiers.