Internal oscillator circuit including a ring oscillator controll

Details Internal oscillator circuit including a ring oscillator controll Internal oscillator circuit including a ring oscillator controll

1999-03-10

2000-07-04

Grimm, Siegfried H.

Oscillators

Ring oscillators

331176, 331177R, 331186, H03B 504

Patent

active

060844833

ABSTRACT:
An oscillator circuit residing internally to a semiconductor device for generating a clock signal for use by digital circuits. The oscillator circuit includes a voltage regulator circuit responsive to frequency selection signals for selecting a predetermined frequency and a supply voltage. The voltage regulator circuit is operative to generate a voltage reference signal having a voltage level being adjusted to compensate for variations due to temperature, process and supply voltage variations. The oscillator circuit further includes a ring oscillator circuit responsive to the voltage reference signal for generating a clock out signal having a particular frequency based upon the voltage level of the voltage reference signal. Wherein the frequency of the clock out signal remains substantially constant despite temperature, process and supply voltage variations in the semiconductor circuit.

REFERENCES:
patent: 5072197 (1991-12-01), Anderson
patent: 5847616 (1998-12-01), Ng et al.

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