Impedance matching for a dual band power amplifier

Details Impedance matching for a dual band power amplifier Impedance matching for a dual band power amplifier

1997-02-19

2000-06-20

Vo, Nguyen

Telecommunications

Transmitter

Power control, power supply, or bias voltage supply

330279, 330306, H01Q 1112

Patent

active

060787945

ABSTRACT:
An exciter matching circuit (125), interstage matching circuit (134), and harmonic filter matching circuit (140) match impedances at the input to a two-stage power amplifier (130), between the first stage (132) and the second stage (136) of the power amplifier (130), and at the output of the power amplifier (130) for more than one frequency band of interest. In a GSM/DCS dual band radiotelephone (101), the matching circuits (124, 134, 140) provide low return loss at 900 MHz when the dual band transmitter (110) is operating in the GSM mode. The harmonic filter matching circuit (140) also filters out signals at 1800 MHz, 2700 MHz, and high order harmonics. When the dual band transmitter (110) is in DCS mode, however, the matching circuits (124, 134, 140) provide a low return loss at 1800 MHz and filter out signals at 2700 MHz and harmonics of 1800 MHz.

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