Self-stabilizing analog to digital converter useful in phase loc

Details Self-stabilizing analog to digital converter useful in phase loc Self-stabilizing analog to digital converter useful in phase loc

1979-02-09

1980-10-07

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347AD, H03K 1320

Patent

active

042271860

ABSTRACT:
A phase locked loop tuning system of a radio receiver includes circuitry for converting the setting of a potentiometer to a binary word for controlling the frequency of the local oscillator signal generated by the phase locked loop. The conversion circuitry includes a voltage comparator having a first input coupled to the wiper of the potentiometer and a second input coupled to a first capacitor. The first capacitor is charged during a first predetermined period. The time at which the voltage developed across the first capacitor exceeds the voltage at the wiper determines the binary control word. To self-stabilize the conversion circuitry, a second capacitor for developing the reference voltage for the potentiometer is charged during a second predetermined period in accordance with the level of the voltage developed across the first capacitor at the end of the first predetermined period.

REFERENCES:
patent: 3070786 (1962-12-01), MacIntyre
patent: 3478348 (1969-11-01), Molyneux
patent: 4050065 (1977-09-01), Mosley
patent: 4085371 (1978-04-01), Mogi
Schmid "Electronic Design" No. 26, Dec. 19, 1968, pp. 61-65.
Schmid "Electronic Design" No. 1, Jan. 4, 1964, pp. 104-108.

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