RECEIVING DEVICE FOR HIGH FREQUENCY DIRECT CONVERTING

PURPOSE: An RF direct conversion receiver is provided to be capable of accurately demodulating only signals of desired band and combining two oscillators into one by removing an IF conversion step and a circuit element therefor. CONSTITUTION: Signals output from a band pass filter(10) are amplified...

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Bibliographic Details
Main Authors CHO, HAN BAEK, JUN, SUNG HUN
Format Patent
LanguageEnglish
Published 15.11.2000
Edition7
Subjects
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
MODULATION
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Summary:PURPOSE: An RF direct conversion receiver is provided to be capable of accurately demodulating only signals of desired band and combining two oscillators into one by removing an IF conversion step and a circuit element therefor. CONSTITUTION: Signals output from a band pass filter(10) are amplified by a low noise amplifier(20), which output is amplified by an RF amplifier(20'). A variable local oscillator(300) is synchronized to the frequency of the RF amplified signal to output oscillating signals of same frequency. A demodulator(500) mixes the Rf amplified signals and the oscillating frequency signal to separate/recover two orthogonal phase modulation signals. The demodulator(500) comprises a gain controller, a phase shifter and a separator.
Bibliography:Application Number: KR19970037215