Patent ID: 8115546
Filing Date: 2012-02-14
Classification: H03F

Abstract:
1. A Doherty amplifier apparatus, the apparatus comprising: a splitter for splitting an input signal into an N number of power signals, wherein the N is equal to an integer of 2 or more; a carrier amplifier for amplifying the signal provided from the splitter using a first Direct Current (DC) bias; an (N−1) number of peaking amplifiers for amplifying the signals provided from the splitter using a second DC bias, which is lower than the first DC bias; a Doherty combiner for, when the carrier amplifier and the (N−1) number of peaking amplifiers are all operating, forming a load impedance of the respective amplifiers such that the load impedance of the (N−1) number of peaking amplifiers are less than the load impedance of the carrier amplifier; and an output load for outputting the signals amplified by the carrier amplifier and the (N−1) number of peaking amplifiers.