Low voltage VCO temperature compensation

Details Low voltage VCO temperature compensation Low voltage VCO temperature compensation

1989-07-18

1990-12-18

Mis, David

Oscillators

Frequency stabilization

Temperature or current responsive means in circuit

331 66, 331177V, H03B 504, H03L 102

Patent

active

049789309

ABSTRACT:
A circuit for temperature compensation of a varactor voltage controlled oscillator control signal includes a proportional to absolute temperature (PTAT) current source and an adjustable, temperature stable current source. The difference between these two current sources defines an offset current. The varactor control signal voltage is shifted by a predetermined reference voltage and offset by an offset voltage proportional to the offset current, in a differential amplifier portion of the circuit, to provide a tuning signal for controlling the varactor so as to compensate for the varactor capacitance temperature drift. The adjustable, temperature stable current source allows tuning the circuit in order to precisely tune the VCO to a desired frequency under a predetermined set of operating conditions in order to correct component and process variations.

REFERENCES:
patent: 4063194 (1977-12-01), Helle
patent: 4156210 (1979-05-01), Lipke
patent: 4412188 (1983-10-01), Helle et al.
patent: 4751475 (1988-06-01), Kubo et al.
patent: 4833426 (1989-05-01), Robichon et al.

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