Phase-lock loop circuit providing very fast acquisition time

Details Phase-lock loop circuit providing very fast acquisition time Phase-lock loop circuit providing very fast acquisition time

1984-09-07

1986-03-04

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 16, 331 25, H03L 700

Patent

active

045742545

ABSTRACT:
The present invention relates to a very fast acquisition phase-lock loop arrangement comprising means for generating an error signal between an input signal to the loop and an output signal of a voltage controlled oscillator (VCO). The generated error signal, over its possible range of phase differences, is transformed by a transforming means into an output signal comprising a predetermined nonlinear response. The output signal from the transforming means is integrated in an integrating means to generate a control signal for appropriately changing the output signal of the VCO. Noise performance can be significantly improved by cascading two or more of the present phase-lock loop arrangements.

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D. Richman, "The DC Quadricorrelator: A Two-Mode Synchronization System", Proc. IRE, vol. 42, No. 1, Jan. 1954, pp. 288-299.
Henry, "Frequency-Agile Millimeter-Wave Phase Lock System", Rev. Sci. Instrum., vol. 47, No. 9, Sep. 1976, pp. 1020-1025.
Spilker, Digital Communications by Satellite, Prentice-Hall, 1977, pp. 359-362.

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