Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Phase comparison
Patent
1986-06-27
1988-06-07
Tokar, Michael J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Phase comparison
375110, G01R 2500
Patent
active
047499370
ABSTRACT:
An improved phase detector for generating a measurement signal indicating the extent to which the actual distance (.tau.) between the flanks of data pulses generated for serial data transmission and the detection times determined by a detection clock differs from a required distance (Tg). The phase detector generates on every flank of a data signal a first pulse and a second pulse by means of two D-flipflops controlled by the detection clock. The width of the first pulse is equal to the period of the clock cycle T. The width of the second pulse is equal to the distance between the flank of the data signal and the next following flank of the clock signal. The amplitudes of the first pulse and the second pulse are adjusted and then are fed to a differential amplifier. The adjustment is such that the ratio between the amplitude of the first pulse and the amplitude of the second pulse is equal to Tg/T. Thus, the average value of the output signal of the differential amplifier is a measure of the difference between the actual distance (.tau.) and the required distance Tg.
REFERENCES:
patent: 4527277 (1985-07-01), Kosaka et al.
patent: 4599570 (1986-07-01), Cloke
patent: 4668917 (1987-05-01), Levine
Arana Louis M.
Oce'-Nederland, B.V.
Tokar Michael J.
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