Design and performance of a novel power amplifier, Linearized S a t u r a t i o n Amplifier w i t h Bidirectional Control(LSA-BC), are presented. A linear amplifier with the high efficiency of a switching-mode saturation amplifier can be realized. A high efficiency GaAs F E T is roughly linearized by dynamically varying its drain DC voltage with a high efficiency variable output DC-DC converter. I n addition, a negative envelope feed-back i s utilized to compensate for the residual. The circuit construction is simple enough for use in the portable subscriber units of a digital mobile radio system. A 1.5 GHz band 1 W LSA-BC is constructed to determine its performance with 32kbps roll-off QPSK. As a result, a 40% total efficiency is achieved as well as a stable 3rd-order intermodulation distortion of -50 dB to the signal level.
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