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US 12,683,550 B2Granted
Methods and apparatus to track an oscillator frequency with digital filters
AssigneeTexas Instruments Incorporated
InventorsAnurag Choudhury, Robin Hoel, Torjus Lyng Kallerud, Ashutosh Mishra
Life of this patent
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Abstract
An example apparatus includes: first oscillator circuitry; second oscillator circuitry; period calculator circuitry coupled to the first oscillator circuitry and coupled to the second oscillator circuitry; averaging circuitry coupled to the period calculator circuitry; and coefficient filter circuitry coupled to the averaging circuitry.
Claims20
An apparatus comprising:
- first oscillator circuitry;
- second oscillator circuitry;
- period calculator circuitry coupled to the first oscillator circuitry and coupled to the second oscillator circuitry;
- averaging circuitry coupled to the period calculator circuitry;
- coefficient filter circuitry coupled to the averaging circuitry;
- and
- multiplexer circuitry including a first input coupled to the period calculator circuitry, a second input coupled to the averaging circuitry, and an output coupled to the coefficient filter circuitry.
4 more elements
An apparatus comprising:
- period calculator circuitry including an output;
- averaging circuitry including an output and coupled to the output of the period calculator circuitry;
- noise detection circuitry coupled to the output of the averaging circuitry;
- and
- coefficient filter circuitry including an output coupled to the noise detection circuitry.
2 more elements
An apparatus comprising:
- period calculator circuitry configurable to determine a number of cycles of a first signal in a period of a second signal;
- averaging circuitry coupled to the period calculator circuitry and configurable to determine an average of the number of cycles of the first signal in a plurality of periods of the second signal;
- and
- coefficient filter circuitry coupled to the averaging circuitry and configurable to filter the average of the number of cycles of the first signal based on a filter coefficient.
1 more element
Dependencies are inferred from the claim text.