VCO composed of plural ring oscillators and phase lock loop inco

Details VCO composed of plural ring oscillators and phase lock loop inco VCO composed of plural ring oscillators and phase lock loop inco

1997-05-01

1999-01-26

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular frequency control means

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

Patent

active

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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