Selectable-input-impedance radio-frequency reception amplifier

摘要

A radio-frequency amplifier includes a matching network comprising a switching unit. The switching unit is operable in a first condition to provide a selected impedance at a first selected frequency. The switching unit is operable in a second condition to form a bandstop filter. A stop band of the bandstop filter includes a second selected frequency. The first selected frequency may be a second harmonic of a transmission frequency different from the second selected frequency. A multi-band transceiver is also described, as is a method of transmitting a first signal and a second signal.

主权项

1. A radio-frequency amplifier, comprising:
a first input terminal; a second input terminal; a gain element; a matching network comprising a switching unit, wherein the matching network is arranged across the first input terminal and the second input terminal, and between the first input terminal, the second input terminal, and the gain element, and wherein the switching unit includes a switch and is operable to
(i) in a first condition, set the switch to a first position to provide a selected impedance at a first selected frequency, and(ii) in a second condition, set the switch to a second, different position to form a bandstop filter, a stop band of the bandstop filter including a second selected frequency.