Power amplifier spurious cancellation

摘要

This disclosure relates generally to power amplification devices and methods of operating the same. The power amplification devices are capable of reducing (and possibly cancelling) modulation of a ripple variation of a supply voltage level of a supply voltage onto a radio frequency (RF) signal. In one embodiment, a power amplification device includes a power amplification circuit configured to amplify an RF signal with a supply voltage such that a ripple variation in a supply voltage level of the supply voltage is modulated onto the RF signal in accordance with a conversion gain. However, the power amplification device also includes a plurality of ripple rejection circuits. The plurality of ripple rejection circuits is configured to produce phase shifts and one or more amplitude shifts in the RF signal so as to reduce the conversion gain of the power amplification circuit.

主权项

1. A power amplification device comprising:
a power amplification circuit having a conversion gain and configured to amplify a radio frequency (RF) signal with a supply voltage such that a ripple variation in a supply voltage level of the supply voltage is modulated onto the RF signal in accordance with the conversion gain; and a plurality of ripple rejection circuits configured to produce phase shifts and one or more amplitude shifts in the RF signal so as to reduce the conversion gain of the power amplification circuit, wherein the plurality of ripple rejection circuits comprises a phase modulator configured to receive the RF signal and produce a first phase shift of the phase shifts.