Circuit arrangement for the phase control of a clock signal

Details Circuit arrangement for the phase control of a clock signal Circuit arrangement for the phase control of a clock signal

1974-06-18

1977-03-15

Morrison, Malcolm A.

Telegraphy

Systems

Line-clearing and circuit maintenance

325 42, 329104, H04L 700, H03K 900

Patent

active

040125912

ABSTRACT:
Apparatus for controlling the phase of a clock signal in a data transmission system is described. In the latter system the data signal is pulse amplitude modulated, routed to a receiver-demodulator over a transmission path, the data signal retrieved by means of a sampling circuit and coupled to a data sink. A difference signal is produced from the demodulated and the data signals; the amplitudes of the difference signal characterize the amplitude differences between the demodulated and the data signals at predetermined sampling instants. Using the demodulated signal a slope signal, which is indicative of the slope of the demodulated signal at the sampling instants is produced. The difference and slope signals are multiplied producing a product signal having amplitudes equal to the product of the latter two signals. The product signal forms a control signal for altering the phase of the clock signal by adding to or suppressing pulses emitted from a frequency divider.

REFERENCES:
patent: 3378771 (1968-04-01), Van Gerwen et al.
patent: 3388330 (1968-06-01), Kretzmer
patent: 3560855 (1971-02-01), Schroeder
patent: 3585298 (1971-06-01), Liberman
patent: 3633115 (1972-01-01), Epstein
patent: 3670251 (1972-06-01), Shintani et al.

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