Enhanced quadrature notch filter
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United States of America Patent
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Mar 15, 1988
Grant Date -
N/A
app pub date -
Dec 10, 1985
filing date -
Dec 10, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An enhanced quadrature notch filter which is capable of rejecting an undesired signal component of an input signal, generally comprising a quadrature phase splitter for producing first and second reference signals which have substantially the same frequency as the undesired signal component but which are 90.degree. out of phase with each other, a pair of amplitude control loops for adding the first and second reference signals to the input signal in amplitudes which will cancel the undesired signal component, and a phase locked loop circuit for maintaining a predetermined phase relationship between the undesired signal component and one of the first and second reference signals.
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