Patent ID: 9124355
Filing Date: 2015-09-01
Classification: H04B,Y10T

Abstract:
1. A radio frequency (RF) communication device comprising: a first signal propagating circuit that enables transmission of a first signal from the communication device, wherein the first signal propagating circuit is configured with a first tunable notch filter coupled within a first transmit path associated with a first transmitter; a second signal propagating circuit capable of simultaneously transmitting a second signal while the first signal is being transmitted along the first transmit path, wherein the second signal propagating circuit is configured with a second tunable notch filter coupled within a second transmit path associated with a second transmitter; and a controller communicatively coupled to a first tuning component of the first tunable notch filter and to a second tuning component of the second tunable notch filter and which: selectively tunes at least one of the first tunable notch filter and the second tunable notch filter to produce a specific combined notch filtering response that reduces a level of intermodulation distortion (IMD) on at least one receive carrier frequency of at least one propagating signal that propagates along a transmission path including at least one of the first tunable notch filter and the second tunable notch filter; wherein to selectively tune at least one of the first tunable notch filter and the second tunable notch filter, the controller: detects that the communication device is actively operating in a single transmission mode; and, in response to detecting that the communication device is operating in single transmission mode, detects which one of the first transmitter and the second transmitter is an active transmitter that is currently performing signal transmission within an active signal propagation path and selectively tunes: (a) one notch filter of the first notch filter and the second notch filter that is associated with the active transmitter path to at least one of an out-of-band position relative to the frequency band of the signal being transmitted via the active transmitter and a lower loss state having a different frequency; and (b) the other notch filter not associated with the active transmitter path to a lower loss state having a different frequency, wherein the active signal propagation includes both transmit and receive paths.