Relaxation oscillators with delay compensation
AssigneeAnalog Devices International Unlimited Company
InventorIssa Niakate
Life of this patent
Estimating the term…
Abstract
Relaxation oscillators with delay compensation are provided herein. In certain embodiments, a relaxation oscillator includes a capacitor, a current source that outputs a charging current, and control circuitry that operates to selectively charge the capacitor with the charging current. The control circuitry includes a primary or main comparator operable to compare a charging voltage of the capacitor to a threshold voltage. The relaxation oscillator further includes delay compensation circuitry coupled to the capacitor and operable to adjust the threshold voltage to provide compensation for a delay of the control circuitry.
Claims20
A relaxation oscillator with delay compensation, the relaxation oscillator comprising:
- a first capacitor;
- a first current source configured to output a first charging current, wherein the first current source is regulated by a feedback loop;
- control circuitry that operates to selectively charge the first capacitor with the first charging current, the control circuitry including a first primary comparator configured to compare a charging voltage of the first capacitor to a threshold voltage, wherein the threshold voltage is generated based on a feedback voltage of the feedback loop;
- and
- delay compensation circuitry electrically coupled to the first capacitor and operable to adjust the threshold voltage to provide compensation for a delay of the control circuitry.
A method of delay compensation in a relaxation oscillator, the method comprising:
- outputting a charging current from a current source;
- regulating the current source using a feedback loop;
- selectively charging a capacitor with the charging current to control a period of the relaxation oscillator using control circuitry;
- comparing a charging voltage of the capacitor to a threshold voltage using a primary comparator of the control circuitry;
- generating the threshold voltage based on a feedback voltage of the feedback loop;
- and
- adjusting the threshold voltage to provide compensation for a delay of the control circuitry.
A method of delay compensation in a relaxation oscillator, the method comprising:
- outputting a charging current from a current source;
- selectively charging a capacitor with the charging current to control a period of the relaxation oscillator using control circuitry;
- comparing a charging voltage of the capacitor to a threshold voltage using a primary comparator of the control circuitry;
- adjusting the threshold voltage to provide compensation for a delay of the control circuitry, including providing the charging voltage to a secondary comparator;
- and
- regulating the charging current using a feedback loop, and using the secondary comparator to compare a feedback voltage of the feedback loop to the charging voltage.
Dependencies are inferred from the claim text.