Circuit arrangement for compensating for the thermal drift of a

Details Circuit arrangement for compensating for the thermal drift of a Circuit arrangement for compensating for the thermal drift of a

1989-04-05

1990-06-26

Pascal, Robert J.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 25, H03L 700

Patent

active

049375377

ABSTRACT:
Circuitry for compensating for the temperature drift of a phase detector (1) in a phase-locked loop which comprises a phase detector (1), a loop filter (2) and in the feedback branch a voltage controlled oscillator (3) coupled to the phase detector (1). The phase detector (1) is provided with a differential output (I and II), which is coupled to the input terminals (- and +) of the operational amplifier (4) in the loop filter (2), whereby the common-mode temperature drift of the phase detector (1), appearing in the input poles of the operational amplifier, is substantially eliminated in the output of the amplifier (Uout).

REFERENCES:
patent: 4118674 (1978-10-01), Ball
patent: 4155050 (1979-05-01), Nichols
patent: 4302732 (1981-11-01), Moulton et al.
patent: 4389621 (1983-01-01), Futatsuishi

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