Circuit for detecting phase shift applied to an RF signal
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United States of America Patent
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Mar 28, 2017
Grant Date -
Feb 11, 2016
app pub date -
Jul 14, 2015
filing date -
Aug 7, 2014
priority date (Note) -
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Abstract
An RF circuit and method for detecting the amount of phase shift applied to an RF signal. An RF heating apparatus including the RF circuit. The RF circuit includes a phase shifter operable to apply a phase shift to a reference signal to produce a phase shifted reference signal. The RF circuit also includes a phase detector operable to detect a phase difference between the phase shifted RF signal and the phase shifted reference signal. The phase detector has a reduced input range at a frequency of the phase shifted RF signal. The RF circuit further includes a controller operable to control the phase shifter to set the phase of the phase shifted reference signal so that the phase difference between the phase shifted RF signal and the phase shifted reference signal falls within the reduced input range of the phase detector.
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