Pro-capture circuit for phase locked loop circuits

Details Pro-capture circuit for phase locked loop circuits Pro-capture circuit for phase locked loop circuits

1994-07-11

1995-07-25

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 14, 331 17, 331 25, 331DIG2, H03L 7095, H03L 710

Patent

active

054365970

ABSTRACT:
A pro-capture circuit for a phase locked loop detects when the phase locked loop is operating outside of its operating range, and then forces the phase locked loop back into the proper range. The principle of detection is general and may be adapted to work in distinct phase locked loop designs. More particularly, the pro-capture circuit is used in a phase locked loop having a normal operating range in which an output signal of the phase locked loop varies between a minimum normal value and a maximum normal value. The pro-capture circuit includes circuitry for sensing when the output signal is outside the normal operating range and circuitry for forcing the output signal to reenter the normal operating range. In accordance with another embodiment, a phase locked loop includes a voltage controlled oscillator that produces an output signal of a controlled frequency in response to a voltage input signal, circuitry for sensing when the output signal is outside a normal operating range by sensing when the voltage input signal is outside a corresponding normal operating range, and circuitry for forcing the output signal to a predetermined level within the normal operating range by forcing the voltage input signal to a corresponding predetermined level within the normal operating range.

REFERENCES:
patent: 4590440 (1986-05-01), Haque et al.
patent: 4853642 (1989-08-01), Otani et al.
patent: 4988955 (1991-01-01), Horie
patent: 5304953 (1994-04-01), Heim et al.

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