Doherty amplifier

Details Doherty amplifier Doherty amplifier

2008-01-30

2010-02-16

Mottola, Steven J (Department: 2817)

Amplifiers

With plural amplifier channels

Redundant amplifier circuits

C330S295000

Reexamination Certificate

active

07663434

ABSTRACT:
The present invention relates to the construction of output stage of the Doherty amplifier and comprises a main amplifying unit, an auxiliary amplifying unit and a compact λ/4 line connecting two amplifying units. The compact λ/4 line connecting two amplifying units includes a first parallel capacitor grounded by being connected to the main amplifying unit in parallel; a second parallel capacitor grounded by being connected to the auxiliary amplifying unit in parallel; and an inductor or a microstrip transmission line connecting the main amplifying unit and the auxiliary amplifying unit. The Doherty amplifier in accordance with the present invention further comprises a matching network unit connecting to a final output by connecting the main amplifying unit and the auxiliary amplifying unit and; and a λ/4 line used as the voltage inputs of the main amplifying unit and the auxiliary amplifying unit.

REFERENCES:
patent: 2007/0139106 (2007-06-01), Dittmer et al.
patent: 2007/0229165 (2007-10-01), Elmala et al.
patent: 2002204133 (2002-07-01), None
patent: 05029851 (2005-02-01), None
patent: 1020050029998 (2005-03-01), None

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