MODULATOR WHICH USES AMPLITUDE RESTORATION
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专利名称：MODULATOR WHICH USES AMPLITUDE RESTORATION
发明人：CORDOBA, JOSE, L.
申请号：EP0111963
申请日：20011012
公开号：WO0235787A3
公开日：
20030103
专利内容由知识产权出版社提供
摘要：A transmitter has a quadrature modulator that provides a modulated signal at a first frequency. The transmitter has a phase locked loop, of which a voltage controlled oscillator is coupled after the phase comparator of the phase locked loop, and further has a power amplifier in the transmit signal path of the transmitter. The phase locked loop further has a down-converter in the feedback path, from the output of the power amplifier, and a feedback input to the phase comparator. The transmitter further has an amplitude restoration arrangement, that restores amplitude information contained in the feedback signal provided by the down-converter. In operation, the phase locked loop replicates, at the carrier frequency, angle information contained in the quadrature modulated signal, and the amplitude restoration arrangement controls the gain of the transmit power amplifier such that input signals at the phase comparator substantially are equal.
申请人：KONINKLIJKE PHILIPS ELECTRONICS N.V.
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