Impedance matching circuit in transmitter circuit and control me

Details Impedance matching circuit in transmitter circuit and control me Impedance matching circuit in transmitter circuit and control me

1996-04-17

1999-01-19

Le, Thanh-Cong

Telecommunications

Transmitter

With variation of antenna impedance or dimension for modulation

455121, 455129, H04B 104

Patent

active

058624589

ABSTRACT:
In an impedance matching circuit used in a transmitter circuit, an occurrence of a reflection wave in an antenna is suppressed. The impedance matching circuit in a transmitter circuit includes a modulating circuit for modulating an input signal to output a modulation signal, a power amplifying circuit for power-amplifying the modulation signal, an antenna for outputting the signal power-amplified by the power amplifying circuit, a demodulating circuit for demodulating the signal power-amplified by the power amplifying circuit to output a demodulation signal, a band-outside-component detecting circuit for detecting a band-outside-component of the demodulation signal, a control circuit for outputting a control signal based upon the signal derived from the band-outside-component detecting circuit, and an impedance matching circuit for matching an input impedance of the antenna with an impedance of the power amplifying circuit by changing an impedance of the impedance matching circuit based upon the control signal.

REFERENCES:
patent: 3643163 (1972-02-01), Bruck
patent: 4493112 (1985-01-01), Bruene
patent: 5483680 (1996-01-01), Talbot
patent: 5525940 (1996-06-01), Heikkila et al.
patent: 5564086 (1996-10-01), Cygan et al.

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