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US 4,728,884 AGranted
Infinite dynamic range phase detector
AssigneeTektronix, Inc.
InventorLinley F. Gumm
Life of this patent
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Abstract
An infinite dynamic range phase detector compares a test signal with a phase shifted reference signal which tracks the phase drift of the test signal. The incremental phase error between the test signal and the phase shifted reference signal is accumulated to provide an n*modulo(360) plus the increment between zero and 360 degrees output. A portion of the accumulated output is fed back as an offset which is applied to a reference signal to produce the phase shifted reference signal.
Claims7
An infinite dynamic range phase detector comprising:
- means for phase shifting a reference signal to produce a shifted reference signal;
- means for determining the phase difference between the shifted reference signal and a test signal to produce an error signal;
- and
- means for computing from the error signal an accumulated output signal, a portion of the accumulated output signal being used to provide an offset to the phase shifting means such that the shifted reference signal tracks the test signal in phase.
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Dependencies are inferred from the claim text.