Voltage-controlled oscillator with reduced phase difference

Details Voltage-controlled oscillator with reduced phase difference Voltage-controlled oscillator with reduced phase difference

1995-08-30

1997-01-07

Mis, David

Oscillators

Ring oscillators

331 55, 331172, 331175, 331177R, H03B 524

Patent

active

055921272

ABSTRACT:
A voltage-controlled oscillator has ring oscillators R1, R2 and R3 which have three amplifier elements A1-A3, A4-A6 and A7-A9 respectively which are connected in the form of a ring. The way of connecting with the respective amplifier elements A10 to A18 is as follows: First, optionally selecting two output terminals from the 3.times.3 amplifier elements which form three ring oscillators, wherein the two output terminals are not selected from the input and output terminals of one amplifier element, and wherein the two output terminals are not selected from the output terminals belonging to the same ring oscillator. Next, connecting the input and output terminals of one of the amplifier elements A10 to A18 to the optionally selected two output terminals. Then repeating the above procedures one or more times to form a network between the ring oscillators R1 to R3. C1 to C9 are nodes for the connections. In the above connections, it is important that none of the two output terminals which are optionally selected from the output terminals of the 3.times.3 amplifier elements which form three ring oscillators have both in-phase and anti-phase paths through between them, on condition that all the signal paths between the two output terminals selected do not pass more than one time through the same output terminal.

REFERENCES:
patent: 5357217 (1994-10-01), Marchesi et al.
John G. Maneatis et al., "Precise Delay Generation Using Coupled Oscillators", IEEE Journal of Solid-Circuits, vol. 28, No. 12, Dec. 1993, pp. 1273-1282.

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