Patent ID: 9571037
Date: 2017-02-14
CPC Classifications: H03F,H04B

Claim:
1. A receiving system comprising: a first amplifier disposed along a first path, corresponding to a first frequency band, between an input of the receiving system and an output of the receiving system; a second amplifier disposed along a second path, corresponding to a second frequency band, between the input of the receiving system and the output of the receiving system; a controller configured to generate a first impedance tuning signal in response to a first band select signal indicating an in-band frequency band as the first frequency band and a first out-of-band frequency band as the second frequency band and to generate a second impedance tuning signal in response to a second band select signal indicating the in-band frequency band as the first frequency band and a second out-of-band frequency band as the second frequency band; and a first impedance matching circuit disposed along the first path and having an impedance selected based on the second frequency band to reduce at least one of a noise figure of the first path for the second frequency band or a gain of the first path for the second frequency band, the first impedance matching circuit having a tunable impedance matching circuit with an impedance selected by the first impedance tuning signal received from the controller.