Circuit for regulating a voltage controlled oscillator
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United States of America Patent
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-
Jan 31, 1989
Grant Date -
N/A
app pub date -
Jan 11, 1988
filing date -
Jan 29, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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