Phase-lock loop circuit having outputs in quadrature

Details Phase-lock loop circuit having outputs in quadrature Phase-lock loop circuit having outputs in quadrature

1989-01-09

1990-08-28

Pascal, Robert J.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 25, H03L 700

Patent

active

049528874

ABSTRACT:
An active voltage divider circuit is applied to the loop filter of a phase-lock loop, thereby providing a variable gain factor, wherein the gain with large phase error is substantially greater than the gain with small phase error. This results in improved acquisition time for large frequency offsets, while providing in the phase-lock state the same performance as a conventional loop having the same natural loop frequency and damping factor. By sampling the applied radio frequency signal with an amplitude detector and applying the sampled output and the output of a phase sensitive detector to an analog divider, amplitude variations of the input signal are cancelled, thereby making the loop filter essentially independent of the amplitude of the input signal. In a further embodiment the input signal is coupled to a quadrature detector wherefrom I and Q output signals are coupled to a divider which provides error signals to the loop filter that are independent of the input signal amplitude.

REFERENCES:
patent: 3703686 (1972-11-01), Hekimian
patent: 4514705 (1985-04-01), Harzer
patent: 4574254 (1986-03-01), Glance
patent: 4827225 (1989-05-01), Lee
Glance, Bernard S., New Phase-Lock Loop Circuit Providing Very Fast Acquisition Time, IEEE Transactions on Microwave Theory and Techniques, vol. MTT-33, No. 9, Sep. 1985.

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