Patent ID: 7561854
Filing Date: 2009-07-14
Classification: H04B

Abstract:
1. A system for lossless transmit path antenna switching in a transceiver using quadrature combined power amplifiers, comprising: a quadrature hybrid power combiner having a first input port, a second input port, an isolated port, and an output port; a first RF power amplifier circuit and a second RF power amplifier circuit respectively coupled to said first input port and said second input port, said first and second RF power amplifier circuit each having an output impedance that is selectively variable between a first state and a second state; and wherein said quadrature hybrid power combiner communicates RF energy from said first and second input port to said output port when said first and second RF power amplifier circuits are each in said first state, and communicates RF energy from said output port to said isolated port when said first and second RF amplifier power circuits are in said second state.