Automatic multiple II/4 phase shifter
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United States of America Patent
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-
N/A
Issued Date -
Apr 10, 2003
app pub date -
Aug 26, 2002
filing date -
Oct 5, 2001
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
An ac input voltage is fed to one input of a multiplier serving phase comparator of a phase-locked loop. The output voltage of the VCO feeding the second input of the phase comparator to lock the frequency has a .pi./4 phase shift with respect to the input voltage. When two such phase locked loops are connected in tandem, a .pi./2 quadrature voltage is obtained. When more than two phase-locked loops are connected in tandem, any multiples of .pi./4 phase shift can be obtained.
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