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US 9,520,881 B1Granted
Systems and methods for tuning an oscillator frequency
AssigneeTexas Instruments Incorporated
InventorsAbhijit Kumar Das, Krishnasawamy Nagaraj, Rahul Bhandarkar
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Abstract
A system for tuning an oscillator frequency. The system includes a trimmed calibration circuit comprising a comparator and trimmed delay element and calibration logic. The calibration logic is configured to receive an output of the comparator and control an on time and an off time of an oscillator based on the output of the comparator.
Claims16
A system for tuning an oscillator frequency, comprising:
- a trimmed calibration circuit comprising a comparator and trimmed delay element;
- and
- calibration logic configured to:
- receive an output of the comparator;
- and
- control an on time and an off time of an oscillator based on the output of the comparator;
- wherein the calibration logic is further configured to:
- receive a clock signal from the oscillator comprising the on time and off time of the oscillator;
- monitor the output of the comparator during a charging cycle of the trimmed calibration circuit and:
- decrease the off time of the oscillator as a result of the comparator output being high at an end of the off time of the oscillator;
- or
- increase the off time of the oscillator as a result of the comparator output being low at the end of the off time of the oscillator;
- and
- monitor the output of the comparator during a discharging cycle of the trimmed calibration circuit and:
- increase the on time of the oscillator as a result of the comparator output being high an end of the on time period of the oscillator;
- or
- decrease the on time of the oscillator as a result of the comparator output being low at the end of the on time period of the oscillator.
14 more elements
A system for tuning an oscillator frequency, comprising:
- a trimmed calibration circuit comprising a comparator and trimmed delay element;
- and
- calibration logic configured to:
- receive an output of the comparator;
- and
- control an on time and an off time of an oscillator based on the output of the comparator;
- wherein the calibration logic is further configured to power down the trimmed calibration circuit as a result of the on and off times of the oscillator reaching a predetermined level of calibration;
- wherein the calibration logic is further configured to power up the trimmed calibration circuit in response to the on or off time of the oscillator deviating from the predetermined level of calibration.
5 more elements
A system for tuning an oscillator frequency, comprising:
- a trimmed calibration circuit comprising a comparator and trimmed delay element;
- and
- calibration logic configured to:
- receive an output of the comparator;
- and
- control an on time and an off time of an oscillator based on the output of the comparator;
- wherein the calibration logic is further configured to power down the trimmed calibration circuit as a result of the on and off times of the oscillator reaching a predetermined level of calibration;
- wherein the calibration logic is further configured to power up the trimmed calibration circuit in response to an indication of a change in temperature above a predetermined threshold.
5 more elements
A system for tuning an oscillator frequency, comprising:
- a trimmed calibration circuit comprising a comparator and trimmed delay element;
- and
- calibration logic configured to:
- receive an output of the comparator;
- and
- control an on time and an off time of an oscillator based on the output of the comparator;
- wherein the calibration logic is further configured to power down the trimmed calibration circuit as a result of the on and off times of the oscillator reaching a predetermined level of calibration;
- wherein the calibration logic is further configured to power up the trimmed calibration circuit in response to an indication of a change in supply voltage above a predetermined threshold.
5 more elements
A system for tuning an oscillator frequency, comprising:
- a trimmed calibration circuit comprising a comparator and a trimmed delay element;
- and
- calibration logic configured to:
- receive an output of the comparator;
- and
- control an on time and an off time of an oscillator based on the output of the comparator;
- wherein a charging cycle of the trimmed calibration circuit is from a reference voltage to a comparison voltage of the comparator that includes a comparator offset voltage;
- and
- wherein a discharging cycle of the trimmed calibration circuit is from a complimentary reference voltage to the comparison voltage of the comparator including the comparator offset voltage.
6 more elements
A method for tuning an oscillator frequency, comprising:
- initiating a charging cycle of a trimmed calibration circuit from a reference voltage to a comparison voltage of a comparator that includes a comparator offset voltage;
- initiating a discharging cycle of the trimmed calibration circuit from a complimentary reference voltage to the comparison voltage of the comparator including the comparator offset voltage;
- controlling an on time and an off time of an oscillator based on the output of the comparator.
Dependencies are inferred from the claim text.