Transmission circuit

Details Transmission circuit Transmission circuit

2006-11-21

2006-11-21

Vuong, Quochien B. (Department: 2618)

Telecommunications

Transmitter

Amplitude modulation

C455S127200, C375S300000, C375S302000

Reexamination Certificate

active

07139534

ABSTRACT:
A transmission circuit includes: a modulated signal generator; a modulated signal line where an OFDM modulated wave flows; a detector; a phase component line for transmitting a phase component; an amplitude component line for transmitting an amplitude component; a level judging circuit for judging the level of the amplitude component; a constant-voltage supply line; first and second selectors; a quadrature converter; and an RF power amplifier. An EER or pseudo-EER technique is performed in a region where the RF input-output characteristic of the RF power amplifier with an EER technique exhibits a linear response, whereas usual modulation is performed in a region where a nonlinear response is exhibited. The modulation method is switched using the level judging circuit and the selectors with reference to a threshold value which is the boundary between the region where the linear response is exhibited and the region where the nonlinear response is exhibited.

REFERENCES:
patent: 3662290 (1972-05-01), Elliott
patent: 4592073 (1986-05-01), Watanabe
patent: 5093637 (1992-03-01), Isota et al.
patent: 5193223 (1993-03-01), Walczak et al.
patent: 6256482 (2001-07-01), Raab
patent: 7010280 (2006-03-01), Wilson
patent: 2001-320246 (2001-11-01), None
patent: 2002/530917 (2002-09-01), None
patent: WO 00/30250 (2000-05-01), None

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