Radio frequency zero if direct down converter
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United States of America Patent
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-
Nov 14, 2000
Grant Date -
N/A
app pub date -
Jul 23, 1998
filing date -
Aug 28, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An RF direct down-conversion topology that is insensitive to leakage and device mismatching is presented. According to the system the RF signal is split into two arms with each arm having a mixer. Each mixer has two inputs namely a phase modulated local oscillator signal and the RF information signal. The phase modulated local oscillator signal between each arm differs by a 90 degrees phase shift. The output of the mixers is subtracted and the output of the subtractor is mixed with the phase modulation signal. The output of the third mixer represents the base band. A low pass filter then removes the unwanted signals.
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