Skyworks Solutions, Inc.
METHODS AND APPARATUS FOR ENHANCED TRANCEIVER PERFORMANCE USING DIFFERENTIAL FILTERING

Abstract:

Noise cancellation techniques based on differential filtering, and front-end modules and wireless devices incorporating same. An example of a front-end module includes transmit, receive, and antenna contacts, and a duplexer including a first transmit filter connected in a transmit path between the transmit contact and the antenna contact, and a first receive filter connected in a receive path between the antenna contact and the receive contact, the first transmit filter having a differential input. In one example, the front-end module includes a power amplifier module connected in the transmit path and configured to supply a differential transmit output on first and second differential signal lines connected to the differential input of the first transmit filter, and a first bandpass filter connected between the first and second differential signal lines and configured to provide a first frequency-specific short between the first and second differential signal lines.