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US 7,042,301 B2Granted
Crystal oscillator emulator
AssigneeMarvell International Ltd.
InventorSehat Sutardja
Life of this patent
Estimating the term…
Abstract
A device for generating an output signal having a frequency. The device having a die temperature and including a first temperature sensor to sense a first temperature. A non-volatile memory to store calibration information for controlling the output signal frequency as a function of the first temperature. A semiconductor oscillator to generate the output signal as a function of the calibration information.
Claims66
A device for generating an output signal having a frequency, the device having a die temperature, comprising:
- a first temperature sensor to sense a first temperature;
- a non-volatile memory to store calibration information for controlling the output signal frequency as a function of the first temperature;
- a semiconductor oscillator to generate the output signal as a function of the calibration information;
- and
- a select input to select the output signal frequency as a function of an external passive component.
2 more elements
A device for generating an output signal having a frequency, the device having a die temperature, comprising:
- a first temperature sensor to sense a first temperature;
- a non-volatile memory to store calibration information for controlling the output signal frequency as a function of the first temperature;
- a semiconductor oscillator to generate the output signal as a function of the calibration information;
- a second temperature sensor to sense an external temperature;
- a heater to control the die temperature;
- and
- a controller, in response to the first and second temperature sensors, to control the heater.
4 more elements
A device having an output frequency and a die temperature, comprising:
- on a semiconductor die;
- a) a first temperature sensor to sense the die temperature and generate a temperature signal;
- b) a heater, in response to the temperature signal, to maintain the die temperature at a predetermined operating temperature;
- c) a non-volatile memory to store calibration information relating the predetermined operating temperature to the output frequency;
- and
- d) a semiconductor oscillator to generate the output frequency as a function of the calibration information;
- e) a select input to select the output frequency as a function of an external passive component.
4 more elements
A method of generating an output signal having a frequency, comprising:
- providing a semiconductor oscillator having a die temperature;
- sensing a first temperature associated with the semiconductor oscillator;
- determining a change in temperature from a calibration temperature to the first temperature;
- determining a frequency correction value based on the change in temperature;
- generating the output signal frequency as a function of the frequency correction value;
- sensing an external temperature;
- and
- adjusting the die temperature to a temperature level greater than the external temperature and for which calibration information is stored.
5 more elements
A device for generating an output signal having a frequency, the device having a die temperature, comprising:
- first means for sensing a first temperature;
- means for storing calibration information for controlling the output signal frequency as a function of the first temperature;
- means for generating an oscillatory output signal as a function of the calibration information;
- and
- means for selecting to select the output signal frequency as a function of an external passive component.
2 more elements
A device for generating an output signal having a frequency, the device having a die temperature, comprising:
- a first temperature sensor to sense a first temperature;
- a non-volatile memory to store calibration information for controlling the output signal frequency as a function of the first temperature;
- a semiconductor oscillator to generate the output signal as a function of the calibration information;
- an active silicon oscillator to generate an output signal having a frequency;
- a summer to determine a frequency error between the output signal of the semiconductor oscillator and the output signal of the active silicon oscillator;
- and
- a controller to control the output signal of the active silicon oscillator as a function of the frequency error.
4 more elements
A device for generating an output signal having a frequency, the device having a die temperature, comprising:
- a first temperature sensor to sense a first temperature;
- a non-volatile memory to store calibration information for controlling the output signal frequency as a function of the first temperature;
- a semiconductor oscillator to generate the output signal as a function of the calibration information;
- a charge pump oscillator to generate an output signal having a frequency;
- and
- the semiconductor oscillator in communication with the charge pump oscillator to calibrate the output signal of the charge pump oscillator.
3 more elements
A method of generating an output signal having a frequency, comprising:
- providing a semiconductor oscillator having a die temperature;
- sensing a first temperature associated with the semiconductor oscillator;
- determining a change in temperature from a calibration temperature to the first temperature;
- determining a frequency correction value based on the change in temperature;
- generating the output signal frequency as a function of the frequency correction value;
- generating a periodic signal having a frequency;
- calibrating the periodic signal with the output signal;
- and
- intermittently powering down the semiconductor oscillator.
6 more elements
A device for generating an output signal having a frequency, the device having a die temperature, comprising:
- first means for sensing a first temperature;
- means for storing calibration information for controlling the output signal frequency as a function of the first temperature;
- means for generating an oscillatory output signal as a function of the calibration information;
- means for generating a periodic signal having a frequency;
- means for summing to determine a frequency error between the output signal and the periodic signal;
- and
- means for controlling to control the periodic signal as a function of the frequency error.
4 more elements
A device for generating an output signal having a frequency, the device having a die temperature, comprising:
- first means for sensing a first temperature;
- means for storing calibration information for controlling the output signal frequency as a function of the first temperature;
- means for generating an oscillatory output signal as a function of the calibration information;
- and
- means for generating a periodic signal having a frequency,
- wherein the means for generating the oscillatory output signal in communication with the means for generating the periodic signal, to calibrate the output signal.
3 more elements
A device for generating an output signal having a frequency, the device having a die temperature, comprising:
- a first temperature sensor to sense a first temperature;
- a non-volatile memory to store calibration information for controlling the output signal frequency as a function of the first temperature;
- a semiconductor oscillator to generate the output signal as a function of the calibration information and independent from a crystal oscillator reference frequency;
- and
- a select input to select the output signal frequency as a function of an external passive component.
2 more elements
A device having an output frequency and a die temperature, comprising:
- on a semiconductor die;
- a) a first temperature sensor to sense the die temperature and generate a temperature signal;
- b) a heater, in response to the temperature signal, to maintain the die temperature at a predetermined operating temperature;
- c) a non-volatile memory to store calibration information relating the predetermined operating temperature to the output frequency;
- d) a semiconductor oscillator to generate the output frequency as a function of the calibration information and independent from a crystal oscillator reference frequency;
- and
- e) a select input to select the output signal frequency as a function of an external passive component.
4 more elements
A method of generating an output signal having a frequency, comprising:
- providing a semiconductor oscillator having a die temperature;
- sensing a first temperature associated with the semiconductor oscillator;
- determining a change in temperature from a calibration temperature to the first temperature;
- determining a frequency correction value based on the change in temperature;
- generating the output signal frequency as a function of the frequency correction value independently from a crystal oscillator reference frequency;
- and
- selecting the output signal frequency as a function of an external passive component.
4 more elements
A device for generating an output signal having a frequency, the device having a die temperature, comprising:
- first means for sensing a first temperature;
- means for storing calibration information for controlling the output signal frequency as a function of the first temperature;
- semiconductor oscillating means for generating an oscillatory output signal as a function of the calibration information and independently from a crystal oscillator reference frequency;
- and
- selecting means for selecting the output signal frequency as a function of an external passive component.
2 more elements
A device for generating an output signal having a frequency, the device having a die temperature, comprising:
- a first temperature sensor to sense a first temperature;
- a non-volatile memory to store calibration information for controlling the output signal frequency as a function of the first temperature;
- a semiconductor oscillator to generate the output signal as a function of the calibration information wherein the calibration information includes plural pre-stored correction values;
- and
- a select input to select the output signal frequency as a function of an external passive component.
2 more elements
A device having an output frequency and a die temperature, comprising:
- on a semiconductor die;
- a) a first temperature sensor to sense the die temperature and generate a temperature signal;
- b) a heater, in response to the temperature signal, to maintain the die temperature at a predetermined operating temperature;
- c) a non-volatile memory to store calibration information relating the predetermined operating temperature to the output frequency;
- and
- d) a semiconductor oscillator to generate the output frequency as a function of the calibration information wherein the calibration information includes plural pre-stored correction values;
- and
- e) a select input to select the output signal frequency as a function of an external passive component.
5 more elements
A method of generating an output signal having a frequency, comprising:
- providing a semiconductor oscillator having a die temperature;
- sensing a first temperature associated with the semiconductor oscillator;
- determining a change in temperature from a calibration temperature to the first temperature;
- determining a frequency correction value based on the change in temperature;
- generating the output signal frequency as a function of the frequency correction value wherein the calibration information includes plural pre-stored correction values;
- and
- selecting the output signal frequency as a function of an external Passive component.
4 more elements
A device for generating an output signal having a frequency, the device having a die temperature, comprising:
- first means for sensing a first temperature;
- means for storing calibration information for controlling the output signal frequency as a function of the first temperature;
- semiconductor oscillating means for generating an oscillatory output signal as a function of the calibration information wherein the calibration information includes plural pre-stored correction values;
- and
- selecting means for selecting the output signal frequency as a function of an external passive component.
2 more elements
Dependencies are inferred from the claim text.