POWER AMPLIFIER DEVICE AND CIRCUITS

摘要

A multi-mode multi-band power amplifier and its circuits are provided. The power amplifier comprises a controller, a wide-band amplifier channel, and a fundamental impedance transformer. The controller receives an external signal and outputs a control signal according to the external signal. The wide-band amplifier channel receives a single-band or a multi-band RF signals through the input terminal, performs power amplification on the RF signals and outputs the RF signals through the output terminal. The fundamental impedance transformer comprises a first segment shared by RF signals in all bands, second segments respectively specific to RF signals in all bands, and a switching circuit controlled by the controller to separate a RF signal which is subject to power amplification to the second segment in a switchable manner for multiplexed outputs. A power amplifier output power control circuit, a gain switching circuit, and a gain attenuation circuit are also provided.

主权项

1. A multi-mode multi-band power amplifier comprising:
a controller; a wide-band amplifier channel; and a fundamental impedance transformer; wherein: the controller is configured to receive an external signal and output a control signal according to the external signal; the wide-band amplifier channel is configured to be controlled by the controller, receive single-band or a multi-band RF signals through an input terminal, perform power amplification on the RF signals, and output the RF signals through an output terminal; the fundamental impedance transformer comprises a first segment shared by the RF signals in a plurality of bands, a plurality of second segments respectively specific the RF signals in each of the plurality of bands, and a switching circuit coupled between the first segment and the second segments; the first segment is coupled with the output terminal of the wide-band amplifier channel; an optimal output fundamental impedance of corresponding band is formed at the output terminals of the plurality of second segments; the switching circuit is controlled by the controller to separate the RF signals subject to power amplification to the second segments in a switchable mode for multiplexed outputs, wherein each output corresponds to one band; the first segment is a shared matching circuit; an input terminal of the shared matching circuit is coupled with the output terminal of the wide-band amplifier channel such that the RF signals subject to power amplification can be output after being subject to primary output fundamental impedance matching; the plurality of second segments are a plurality of specific matching circuits, wherein the specific matching circuits are configured to match the RF signals, subject to primary output fundamental impedance matching, of the corresponding bands to the optimal output fundamental impedance and then output the RF signals; and the switching circuit is a first switching array comprising a plurality of first switching devices controlled by the controller to couple the RF signals, subject to primary output fundamental impedance matching, of the corresponding bands to the corresponding specific matching circuits.