Enhancement of Doherty Amplifier
Abstract
Various techniques to enhance the performance of the idealized Doherty amplifier are introduced. The drain bias of the peaking amplifier is applied at a higher voltage than that of the carrier. It can control the peak efficiency back-off point, and the knee effect can be absorbed. The carrier amplifier is matched at the first peak efficiency point. This design method relaxes the mismatch problem of the conventional design at the high-power-generation region. The optimized carrier and peaking amplifier designs are introduced to maximize the power performance. The Doherty amplifier design based on a saturated amplifier is introduced to maximize the efficiency. The average power tracking ...
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