Phase meter and method of providing a voltage indicative of a ph

Details Phase meter and method of providing a voltage indicative of a ph Phase meter and method of providing a voltage indicative of a ph

1996-02-29

1998-11-03

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

324 7683, 326127, 327 7, G01R 2500

Patent

active

058314237

ABSTRACT:
A phase meter and method of providing a voltage indicative of a phase difference between a reference signal and an input signal in which the amplitudes of the two signals are made approximately the same to cancel potential phase errors caused by different amplitudes, and the two signals are provided to two matched comparators, one receiving the input signal and the other receiving the reference signal. The two matched comparators are connected together so as to provide an output logic signal in accordance with a prescribed, unconventional, truth table. The output logic signal is a pulse whose duration is proportional to the phase difference. The output logic signal is converted to a voltage indicative of the phase difference between the reference signal and the input signal. The phase meter is relatively simple to make and a preferred embodiment measures phase shift directly with a 10 mV/degree output at up to 10 MHz.

REFERENCES:
patent: 3441745 (1969-04-01), Reeves et al.
patent: 3469196 (1969-09-01), Cowin et al.
patent: 3519845 (1970-07-01), Larriva et al.
patent: 4017801 (1977-04-01), Riedel
patent: 4534004 (1985-08-01), Vollmayr
Linear Databook, National Semicinductor, "LM 1496 Ballanced Modulator-Demodulator", National Semiconductor Corporation, pp. 10-84.

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