Voltage controlled oscillator provided with negative feedback bi

Details Voltage controlled oscillator provided with negative feedback bi Voltage controlled oscillator provided with negative feedback bi

1993-01-08

1994-08-30

Mis, David

Oscillators

Negative resistance or negative transconductance oscillator

331 8, 331 34, 331115, 331177R, 333213, 333215, H03B 500, H03H 1100

Patent

active

053431707

ABSTRACT:
A voltage controlled oscillator (VCO) including a negative feedback circuit operates in response to a negative feedback signal generated during active transistor region operation of transistors in transconductance amplifying stages coupled thereto. As a result, harmonic distortion and problems of noise and unstable frequency oscillation are obviated or significantly reduced. The VCO includes first and second variable transconductance (gm) amplifying stages whose non-inverting (+) and inverting (-) terminals are respectively grounded and a first condenser connected between an output terminal of the first transconductance (gm) amplifying stage and a non-inverting (+) terminal of the second transconductance (gm) amplifying stage. A negative-resistive circuit is used to provide a negative feedback.

REFERENCES:
patent: 4760353 (1988-07-01), Perkins
Kawano et al., "A Single Chip Y/C Signal Processing IC for VHS VCRs", IEEE Transactions on Consumer Electronics, Electronics, vol. 35, No. 4, Nov., 1989, pp. 744-745.

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