High precision PLL with circuit for preventing erroneous capture

Details High precision PLL with circuit for preventing erroneous capture High precision PLL with circuit for preventing erroneous capture

1990-05-29

1991-10-01

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With intermittent comparison controls

331 17, 331 20, 331 25, H03L 7093

Patent

active

050537245

ABSTRACT:
In a high prrecision PLL circuit arrangement, a phase detecting circuit produces a detecting signal which is directly proportional to a phase difference between a horizontal synchronizing signal and a voltage-controlled oscillating signal. A loop filter circuit produces a delay signal for delaying a frequency control at a predetermined time constant in response to the detecting signal derived from the phase detecting circuit. A voltage-controlled oscillating circuit produces an oscillating signal having a frequency directly proportional to a voltage of the delay signal from the loop filter circuit. A non-linear circuit includes a non-linear element for changing at least one of an AC gain and a DC gain of the loop filter circuit, and prevents an erroneous capture phenomenon of the PLL circuit arrangement in response to the detecting signal from the phase detecting circuit.

REFERENCES:
patent: 2912651 (1959-11-01), Leeds
patent: 3572244 (1973-09-01), Giger

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