Patent ID: 9712119
Date: 2017-07-18
CPC Classifications: H03F,H04B

Claim:
1. A circuit network for a Doherty power amplifier, the circuit network comprising: a splitter circuit configured to receive a radio-frequency (RF) signal and split the RF signal into a first portion along a first path to an input of a carrier amplifier of the Doherty power amplifier and a second portion along a second path to an input of a peaking amplifier of the Doherty power amplifier; and a tunable circuit comprising at least one of a section of the first path and a section of the second path, the tunable circuit configured to provide control of the amplitude and phase of at least one of the first portion and second portion, the tunable circuit including a balun-based circuit, the balun-based circuit including a balun having a first node configured to receive the input signal, a second node coupled to the carrier amplifier via a first resistor, a third node coupled to the peaking amplifier via a second resistor, and a fourth node coupled to a ground potential via a termination impedance, the balun-based circuit further including a first capacitor coupled between the first node and the third node and a second capacitor coupled between the second node and the fourth node.