Differential-type voltage-controlled oscillator with low-frequen

Details Differential-type voltage-controlled oscillator with low-frequen Differential-type voltage-controlled oscillator with low-frequen

1995-10-20

1997-06-03

Mis, David

Oscillators

Ring oscillators

331175, 331177R, 327237, 327270, H03B 524, H03L 7099

Patent

active

056358784

ABSTRACT:
A differential-type voltage-controlled oscillator (VCO) with low-frequency stability compensation is disclosed. The differential-type VCO comprises a voltage-to-current converter for converting an input voltage signal into a biasing current signal to control the frequency of the VCO output. The VCO further comprises a number of stages of differential amplifiers connected in cascade. Each of the stages of differential amplifiers includes a pair of differential input PMOS transistors, with each of the PMOS transistors connected to a pair of NMOS load transistors. Each of the pair of NMOS load transistors are connected in parallel. The VCO further comprises a number of stages of bias circuits connected in cascade. Each of the bias circuits is connected to a corresponding stage of the differential amplifiers for receiving the bias current generated by the voltage-to-current converter. Each of the stages of bias circuits comprises a current source for supplying a constant current to maintain the low-frequency voltage-frequency linearity of the output of the VCO, and a biasing PMOS transistor connected in parallel with said current source.

REFERENCES:
patent: 5382921 (1995-01-01), Estrada et al.
patent: 5440277 (1995-08-01), Ewen et al.
patent: 5469120 (1995-11-01), Nguyen et al.

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