PLL Detection circuit having dual bandwidth loop filter

Details PLL Detection circuit having dual bandwidth loop filter PLL Detection circuit having dual bandwidth loop filter

1982-04-13

1984-11-13

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

331 17, 331 25, 331DIG2, 329122, H03L 710

Patent

active

044828691

ABSTRACT:
A PLL detection circuit for use in an AM-PM type AM stereo receiver in which unwanted AC signal components included in the output of a phase comparator are suppressed by switching the frequency response characteristic of a loop filter in the PLL detection circuit as locking is reached so that only the DC signal component, corresponding to the phase difference of the input signal and a reference signal, is outputted. A changeover circuit, including a switching circuit composed of a pair of parallel-connected transistors, is connected in parallel with an element of the loop filter, the component value of which affects or is at least partially determinative of the frequency response characteristic of the loop filter. The changeover circuit is activated by a control signal indicative of the locking state of the PLL detection circuit.

REFERENCES:
patent: 4077015 (1978-02-01), Carson et al.

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