Patent ID: 8380153
Filing Date: 2013-02-19
Classification: H04B

Abstract:
1. A radio front end comprises: a transformer having a first winding and a second winding, wherein the first winding is operably coupled to an antenna and the second winding is operably coupled to at least one of a power amplifier and a low noise amplifier; and an adjustable load operably coupled to the first winding and operable to compensate for differing loads on the second winding in a transmit mode when the power amplifier is enabled and in a receive mode when the low noise amplifier is enabled, wherein the adjustable load is operable to provide a first impedance based on a first impedance selection signal when the radio front end is in the transmit mode and provides a second impedance based on a second impedance selection signal when the radio front end is in the receive mode such that impedance at the first winding is substantially similar in the transmit mode and in the receive mode.