Compensated phase locked loop circuit

Details Compensated phase locked loop circuit Compensated phase locked loop circuit

1989-09-01

1990-11-13

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Transistorized controls

331 16, 331 17, 331 25, H03L 7089

Patent

active

049704729

ABSTRACT:
A Phase Locked Loop (PLL) circuit includes a compensation circuit which corrects for non-linear sensitivity of a varactor of a voltage controlled oscillator (VCO) which is part of the circuit. The varactor is employed as a capacitance tuning element. The compensation circuit controls the sensitivity of a charging/discharging circuit (a charge pump) of the PLL circuit with a feedback signal which is derived from an input to the VCO. The sensitivity characteristic of the charge pump is made the complement of the non-linear portion of the VCO sensitivity characteristic.

REFERENCES:
patent: 4636748 (1987-01-01), Latham, II
patent: 4649353 (1987-03-01), Sonnenberg
patent: 4829545 (1989-05-01), Guzik et al.

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