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US 8,575,994 B2Granted
Circuit and method for generating a clock signal
AssigneeSTMicroelectronics (China) Investment Co., Ltd.
InventorsAlex Li, Welsin Wang
Life of this patent
Estimating the term…
Abstract
A clock source is configured to provide an oscillating signal to be divided into a clock signal. A temperature sensor senses a first temperature of the clock source. The clock source is subjected to at least one second temperature implemented by a temperature alteration module. A calibration module calibrates the clock signal based on the at least one second temperature, the first temperature, a reference signal, and the oscillating signal at the at least one second temperature.
Claims18
A circuit, comprising:
- a clock source configured to provide an oscillating signal to be divided into a clock signal;
- a temperature sensor configured to sense a first temperature of the clock source;
- wherein a temperature at the clock source is alterable so as to subject the clock source to at least one second temperature;
- and
- a calibration module configured to calibrate the clock signal based on the at least one second temperature, the first temperature, a reference signal, and the oscillating signal at the at least one second temperature, wherein the calibration module is configured to compare frequencies of the reference signal and the oscillating signal in order to calibrate the clock signal.
2 more elements
A circuit, comprising:
- a clock source configured to provide an oscillating signal to be divided into a clock signal;
- a temperature sensor configured to sense a first temperature of the clock source;
- wherein a temperature at the clock source is alterable so as to subject the clock source to at least one second temperature;
- a calibration module configured to calibrate the clock signal based on the at least one second temperature, the first temperature, a reference signal, and the oscillating signal at the at least one second temperature;
- and
- a temperature alteration module configured to alter a temperature at the clock source and thus subject the clock source to at least one second temperature.
3 more elements
A circuit, comprising:
- a clock source configured to provide an oscillating signal to be divided into a clock signal;
- a temperature sensor configured to sense a first temperature of the clock source;
- wherein a temperature at the clock source is alterable so as to subject the clock source to at least one second temperature;
- a calibration module configured to calibrate the clock signal based on the at least one second temperature, the first temperature, a reference signal, and the oscillating signal at the at least one second temperature;
- wherein the temperature sensor comprises a thermistor.
2 more elements
A circuit, comprising:
- a clock source configured to provide an oscillating signal to be divided into a clock signal;
- a temperature sensor configured to sense a first temperature of the clock source;
- wherein a temperature at the clock source is alterable so as to subject the clock source to at least one second temperature;
- a calibration module configured to calibrate the clock signal based on the at least one second temperature, the first temperature, a reference signal, and the oscillating signal at the at least one second temperature;
- wherein the clock signal is generated by a real time clock device;
- and
- wherein the real time clock device comprises an electric meter.
4 more elements
A method, comprising:
- measuring a first temperature of a clock source;
- subjecting the clock source to at least one second temperature;
- generating at least one calibration parameter based on the at least one second temperature, a reference signal and an oscillating signal of the clock source at the at least one second temperature;
- and
- calibrating a clock signal obtained by dividing the oscillating signal based on the at least one calibration parameter and the first temperature;
- wherein generating further comprises comparing frequencies of the reference signal and oscillating signal in order to calculate said at least one calibration parameter.
3 more elements
A method, comprising:
- measuring a first temperature of a clock source;
- subjecting the clock source to at least one second temperature;
- generating at least one calibration parameter based on the at least one second temperature, a reference signal and an oscillating signal of the clock source at the at least one second temperature;
- and
- calibrating a clock signal obtained by dividing the oscillating signal based on the at least one calibration parameter and the first temperature;
- wherein subjecting comprises:
- coupling a power resistor to a power supply in response to a control signal.
4 more elements
Dependencies are inferred from the claim text.