VCO composed of plural ring oscillators and phase lock loop inco

Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular frequency control means

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331 47, 331 48, 331 52, 331 56, 331 57, 331177R, H03B 504, H03K 3354, H03L 7099

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058642587

ABSTRACT:
A voltage-controlled oscillator, with high noise rejection of the supply voltage, includes a plurality of delay cells in an odd number N.gtoreq.3, which are connected to form a first ring oscillator and powered by the difference between a supply voltage Vcc and a variable regulating voltage VR. The VCO comprises at least one second ring oscillator formed by a plurality of delay cells in an odd number M.gtoreq.3, at least one of which is also a delay cell of the first oscillator and at least two of which do not belong to the first oscillator. At least one of these two cells is powered by a constant voltage (Vcc), in such a manner that the two oscillators operate at the same frequency and the interaction between the two oscillators introduces a high-frequency negative feedback which has the effect of effectively reducing the noise of the supply voltage Vcc.

REFERENCES:
patent: 4105950 (1978-08-01), Dingwall
patent: 5357217 (1994-10-01), Marchesi et al.
patent: 5463353 (1995-10-01), Countryman et al.
Enam et al., IEEE Journal of Solid-State Circuits, "A 300-MHz CMOS Voltage-Controlled Ring Oscillator", vol. 25, No. 1, (Feb. 1, 1990), pp. 312-315.
Alvarez et al., IEEE Journal of Solid-State Circuits, "A Wide-Bandwidth Low-Voltage PLL for Power PCTM Microprocessors", vol. 30, No. 4, (Apr. 1, 1995), pp. 383-390.

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