Patent Number: 7,133,649

Title: Negative feedback amplifier for transmitter, transmitter, and method of correcting error in the negative feedback amplifier

Abstract: A negative feedback amplifier for a transmitter, in which a vector corrector outputs the corrected signals, an adder adds the feedback signals of the in-phase component and the quadrature component to the in-phase component and the quadrature component of the output of the vector corrector, respectively, a modulator performs a quadrature modulation with respect to the in-phase component and the quadrature component of the outputs from the adder, a power amplifier amplifies the output of the modulator, a demodulator performs a quadrature demodulation to a part of the output of the power amplifier and outputs the feedback signals of the in-phase component and the quadrature component, and the vector corrector performs a correcting operation of canceling an error of at least one of the phases and the amplitudes of the in-phase component and the quadrature component occurring in the demodulator.

Inventors: Kanazawa; Masayuki (Kodaira, JP), Kudo; Masanori (Kodaira, JP)

Assignee: Hitachi Kokusai Electric, Inc.

International Classification: H04B 1/02 (20060101)

Expiration Date: 2019-11-07 0:00:00