Zero-IF receiver wih feedback loop for suppressing interfering signals
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United States of America Patent
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-
Jan 5, 1988
Grant Date -
N/A
app pub date -
Apr 21, 1986
filing date -
May 8, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A working on the zero IF principle is disclosed which contains a feedback circuit instead of a preselector for suppressing interfering signals. The interfering signals contained in the incoming signal (F.sub.E) are separated from the useful signal by filters in the baseband. They are then reconverted to the RF value, amplified, and substracted from the incoming signal (F.sub.E) by a subtracter (S1). In the steady state, the output of the subtracter (S1) provides the useful signal, which is converted into the baseband and then fed to a signal processor (SV).
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