Low phase noise LC oscillator for microprocessor clock distribut

Details Low phase noise LC oscillator for microprocessor clock distribut Low phase noise LC oscillator for microprocessor clock distribut

1998-02-13

2000-01-18

Mis, David

Oscillators

Solid state active element oscillator

Transistors

331 8, 331 17, 331 36C, 331 74, 331 75, 331 96, 331117D, 331177V, H03B 512, H03B 518, H03L 7099

Patent

active

060160829

ABSTRACT:
A microprocessor includes an on-chip low phase noise CMOS LC capacitance oscillator. The LC oscillator is relatively insensitive to power supply fluctuations. In addition, the LC oscillator is operable over a range of frequencies sufficient to support both normal full power operation, and reduced power operation of the microprocessor. The LC oscillator minimizes clock jitter problems and so permits extension of the microprocessor operating frequency to even higher levels than heretofore were possible. An output signal from a phase-frequency detector is a frequency control signal on a frequency control input line of a level converter and filter circuit of the LC oscillator. The output signal from level converter and filter circuit is a filtered frequency control signal on a control voltage input line to a continuously modifiable gigahertz frequency voltage controlled oscillator (VCO) circuit. Continuously modifiable gigahertz frequency VCO circuit generates an output signal with a frequency that is dependent on the voltage on control voltage input line. The output signal from the continuously modifiable gigahertz frequency VCO is a differential current signal to a level shifter output circuit. The level shifter output circuit converts the current signal to a single-ended voltage that is supplied to an output driver. The output driver provides the output signal to a clock distribution network.

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Nhat M. Nguyen, & Robert G. Meyer, "Si IC-Compatible Inductors and LC Passive Filters, "IIEE Journal of Solid State Circuits, vol. 25,, No. 4, pp. 1028 to 1031, Aug. 1990.
R. Bhagwan & A. Rogers, "A 1GHZ Dual-Loop Microprocessor PLL with Instant Frequency Shifting, "1997 IEEE International Solid-State Circuits Conference, pp. 336, 337, Feb. 8, 1997.
J. Craninckx & M. Steyaert, "A 1.8-GHz Low-Phase-Noise CMOS VCO Using Optimized Hollow Spiral Inductors, "IEEE Journal of Solid State Circuits , vol. 32, No. 5, pp. 736 to 744, May 1997.

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