Direct conversion receiver capable of canceling DC offset voltages
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United States of America Patent
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Jan 16, 2001
Grant Date -
N/A
app pub date -
Mar 3, 1998
filing date -
Mar 5, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A direct conversion receiver comprising mixers for mixing a received radio frequency signal and a local oscillation signal in frequency, a signal processing unit for converting the output signal of the mixers into a baseband signal, a delta-sigma modulator for detecting offset voltage from the output signal of the signal processing unit, a holding circuit for supplying offset canceling voltage for canceling the offset voltage, and a switch of supplying the output signal of the mixers to the delta-sigma modulator during a given period and supplying the offset canceling voltage sent from the holding circuit to the output side of the mixers.
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