Circuit for regulating a voltage controlled oscillator

Details Circuit for regulating a voltage controlled oscillator Circuit for regulating a voltage controlled oscillator

1988-01-11

1989-01-31

Laroche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 25, 331 44, H03L 706

Patent

active

048018953

ABSTRACT:
The circuit is particularly suitable for controlling a unit for reading and writing data on a magnetic disk. The oscillator (26) is supplied to an input with a bias voltage (R27, R28) and a phase displacement voltage which is defined by a voltage adder (R25, R26, or R23, R24 connected to a resistive divider R21, R22 or R19, R20), comprising at least one resistor (R21, R22 or R19, R20) which is calibratable so as to define a preset voltage component. The adder adds to this component a control component derived by a phase comparator, current pump (19), integrator (21) and operational amplifier (22). The circuit is in the form of a hybrid integrated circuit in which the resistors are produced by means of the deposit of a thick-film resistive layer while the resistance can be calibrated by means of the removal of part of the appropriate deposited resistive layer.

REFERENCES:
patent: 4568888 (1986-02-01), Kimura et al.

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