Phase-locking loop with variable bandwidth filter

Details Phase-locking loop with variable bandwidth filter Phase-locking loop with variable bandwidth filter

1975-04-14

1976-09-14

Grimm, Siegfried

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 25, 333 70CR, H03B 304

Patent

active

039809692

ABSTRACT:
A phase-locking network at the receiving end of a transmission channel carries an incoming wave of predetermined frequency matching the operating frequency of a local oscillator the incoming wave and the locally generated oscillations being fed to respective inputs of a phase comparator producing a control voltage delivered through a low-pass filter to the oscillator for reducing any existing phase difference. The signal path between the phase comparator and the oscillator includes one or more nonlinear impedance elements, either within the filter or in cascade therewith, which lowers the effective series resistance of the path in the presence of a high control voltage and thereby increases its bandwidth during an acquisition period as compared with steady-state operation.

REFERENCES:
patent: 3316497 (1967-04-01), Brooks
patent: 3805183 (1974-04-01), Lance

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