本发明揭示具有可调阻抗终端电路之杜赫功率放大器组合器。一信号组合器可包含具有一第一线圈及一第二线圈之一平衡-不平衡变压器电路。可在一第一端口与一第二端口之间实施该第一线圈。可在一第三端口与一第四端口之间实施该第二线圈。可借由一第一电容器来耦合该第一端口与该第三端口。可借由一第二电容器来耦合该第二端口与该第四端口。该第一端口可经组态以接收一第一信号。该第四端口可经组态以接收一第二信号。该第二端口可经组态以产生该第一信号与该第二信号之一组合。该信号组合器可包含将该第三端口耦合至一接地之一终端电路。该终端电路可包含一可调阻抗电路。

Doherty power amplifier combiner with tunable impedance termination circuit. A signal combiner can include a balun transformer circuit having a first coil and a second coil. The first coil can be implemented between a first port and a second port. The second coil can be implemented between a third port and a fourth port. The first port and the third port can be coupled by a first capacitor. The second port and fourth port can be coupled by a second capacitor. The first port can be configured to receive a first signal. The fourth port can be configured to receive a second signal. The second port can be configured to yield a combination of the first signal and the second signal. The signal combiner can include a termination circuit that couples the third port to a ground. The termination circuit can include a tunable impedance circuit.