| abstract |
A digitally controlled power amplifier (DPA) includes a radio frequency digital-to-analog converter (RF‑DAC) constructed from nonlinearly weighted PA segments, a polyphase RF drive signal generator that drives the PA segments, and an overdrive voltage control circuit system. The nonlinear weighting of the PA segment inherently compensates for the amplitude codeword dependent amplitude distortion (ACW-AM distortion) involved in the operation of the RF‑DAC, and the polyphase RF drive signal generator contributes to the ACW‑dependent phase distortion (ACW‑PM distortion) reduction, thereby eliminating the need for complexity and efficiency reduction digital predistortion. Overdrive voltage control circuitry is used to fine-tune the DPA's RF output and compensate for other non-idealities and external influences, such as process, voltage, temperature (PVT), frequency, and/or load impedance variations. |