Power amplifier having negative feedback circuit for transmitter
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United States of America Patent
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Feb 17, 2004
Grant Date -
N/A
app pub date -
Sep 29, 2000
filing date -
Oct 8, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A power amplifier having a negative feedback circuit for a transmitter and a control method for its phase are arranged as follows. An I-component baseband signal is added to an I-component baseband feedback signal for producing an I-component adding signal. A Q-component baseband signal is added to a Q-component baseband feedback signal for producing a Q-component adding signal. A modulator orthogonally modulates a carrier signal by the I-component adding signal and the Q-component adding signal. An amplifying circuit operates to amplify the quadrature-modulated signal. A demodulating circuit orthogonally demodulates the part of the output of the amplifying circuit and the carrier signal and then outputs the I-component baseband feedback signal and the Q-component baseband feedback signal. Then, the phase of a selected one of the I-component baseband signal and the Q-component baseband signal is compared with the phase of the adding signal corresponding to the selected component baseband signal for detecting if a phase shift exists. If a phase shift exists, the phase of the carrier signal is adjusted so that the phase shift may be made smaller.
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