Transmission method and transmitter circuit

Details Transmission method and transmitter circuit Transmission method and transmitter circuit

2005-10-31

2008-12-16

Urban, Edward (Department: 2618)

Telecommunications

Transmitter

Plural modulation

C455S126000, C455S110000, C375S300000, C375S302000

Reexamination Certificate

active

07466965

ABSTRACT:
An amplitude component of a modulating signal is detected, band-divided by first and second frequency selecting circuits, and an amplitude component of a high-frequency band is down-converted by a first frequency conversion circuit. An amplitude component selected by the first frequency selecting circuit and an amplitude component selected by the first frequency conversion circuit are amplified by first and second operational amplifiers, and a signal amplified by the second operational amplifier is up-converted by a second frequency conversion circuit to be restored to the initial frequency band. Output amplitudes of the first operational amplifier and a second frequency converter are added up by an adder to be direct-current converted. The amplitudes after the direct-current conversion are band-divided by third and fourth frequency selecting circuits, respectively, feedback amounts thereof are adjusted, and then fed back to the first and second operational amplifiers.

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