Voltage controlled oscillator suitable for complete implementati

Details Voltage controlled oscillator suitable for complete implementati Voltage controlled oscillator suitable for complete implementati

1992-03-13

1993-02-16

Mis, David

Oscillators

With distributed parameter resonator

331 36C, 331108C, 331117R, 331117D, 331177R, H03B 512, H03B 518, H03L 7099

Patent

active

051874504

ABSTRACT:
An embodiment of the present invention is a voltage controlled oscillator (VCO) comprised of a differential pair of transistors that have respective positive feedback paths with phase-lead networks cross-coupled. Each positive feedback path on each side has two different phase-lead branches. The two phase-lead branches have the same phase differences on each side of the differential pair, in order to maintain a symmetry that improves common-mode noise rejection on a voltage control differential input. Current-steering is used to control the mixture of currents that arrive at the bases of the differential transistor pair from the respective two different phase-lead branches, and thereby changing the frequency of the VCO.

REFERENCES:
patent: 3382457 (1968-05-01), Conway
patent: 3691475 (1972-09-01), Mouri et al.

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