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US 2024/0146308 A1Published application
Calibration device and method for calibrating frequency drift and electronic device using the same
AssigneeNuvoton Technology Corporation
InventorsPING-WEN LAI, TU-HSIU WANG
Life of this patent
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Abstract
A calibration device, method and electronic device using the same provided by embodiments of the present disclosure only need to measure frequency values of two temperatures, then calculate frequency drift rates of various configuration combinations, and select the configuration combination with the smallest frequency drift rate to set configuration values of a trimming module. Thus, the test time can be reduced. In one embodiment, a simple heating device can be directly disposed on the chip package structure of the electronic device, so it is not necessary to use an external heating device for heating, and the environmental space required for placing the external heating device can be reduced.
Claims12
A calibration device for calibrating a frequency drift of an electronic device, comprising:
- a trimming module, electrically connected to an output signal generating circuit of the electronic device, comprising a proportional to absolute temperature (PTAT) trimming device, a complementary to absolute temperature (CTAT) trimming device, and a reference trimming device, and configured to trim a frequency of an output signal of the output signal generating circuit,
- wherein the PTAT trimming device is defined with a plurality of first configuration values, and the CTAT trimming device is defined with a plurality of second configuration values, and
- wherein one of the plurality of first configuration values and one of the plurality of second configuration values form one of a plurality of first configuration combinations;
- and
- a configuration selection module, electrically connected to the trimming module,
- wherein when a temperature of the electronic device is a first temperature, the configuration selection module respectively sets the PTAT trimming device and the CTAT trimming device based on the first configuration combinations to obtain a plurality of first frequency values of the output signal corresponding to the plurality of first configuration combinations, wherein for the plurality of first configuration combinations, the configuration selection module selects a plurality of third configuration values of the reference trimming device which make the frequency of the output signal close to a target frequency value, and a plurality of second frequency values of the frequency of the output signal corresponding to the plurality of selected third configuration values, and the configuration selection module records the plurality of first configuration combinations and the corresponding plurality of third configuration values into a plurality of second configuration combinations;
- and
- wherein when the temperature of the electronic device is a second temperature greater than the first temperature, the configuration selection module obtains a plurality of third frequency values of the output signal of the plurality of second configuration combinations, then calculates a plurality of frequency drift rates of the plurality of second configuration combinations based on the plurality of third frequency values and the plurality of second frequency values, to select the second configuration combination with a smallest frequency drift rate, and the configuration selection module sets a plurality of configurations of the PTAT trimming device, CTAT trimming device and the reference trimming device based on the selected second configuration combination.
5 more elements
A calibration device for calibrating a frequency drift of an electronic device, comprising:
- a trimming module, electrically connected to an output signal generating circuit of the electronic device, comprising a proportional to absolute temperature (PTAT) trimming device and a complementary to absolute temperature (CTAT) trimming device, and configured to trim a frequency of an output signal of the output signal generating circuit,
- wherein the PTAT trimming device is defined with a plurality of first configuration values, and the CTAT trimming device is defined with a plurality of second configuration values, and
- wherein one of the plurality of first configuration values and one of the plurality of second configuration values form one of a plurality of configuration combinations;
- and
- a configuration selection module, electrically connected to the trimming module,
- wherein when a temperature of the electronic device is a first temperature, the configuration selection module respectively sets the PTAT trimming device and the CTAT trimming module based on the plurality of configuration combinations to obtain a plurality of first frequency values of the output signal corresponding to the plurality of configuration combinations, and
- wherein when the temperature of the electronic device is a second temperature greater than the first temperature, the configuration selection module obtains a plurality of second frequency values of the output signal of the plurality of configuration combinations, calculates a plurality of frequency drift rates of the plurality of configuration combinations based on the plurality of second frequency values and the plurality of first frequency values, and selects the configuration combination with a smallest frequency drift rate to set a plurality of configurations of the PTAT trimming device and the CTAT trimming device.
4 more elements
An electronic device, comprising:
- a calibration device, configured to calibrate a frequency drift of the electronic device, comprising:
- a trimming module, electrically connected to an output signal generating circuit of the electronic device, comprising a proportional to absolute temperature (PTAT) trimming device, a complementary to absolute temperature (CTAT) trimming device and a reference trimming device, and configured to trim a frequency of an output signal of the output signal generating circuit,
- wherein the PTAT trimming device is defined with a plurality of first configuration values, and the CTAT trimming device is defined with a plurality of second configuration values, and
- wherein one of the plurality of first configuration values and one of the plurality of second configuration values form one of a plurality of first configuration combinations;
- and
- a configuration selection module, electrically connected to the trimming module,
- wherein when a temperature of the electronic device is a first temperature, the configuration selection module respectively sets the PTAT trimming device and the CTAT trimming device based on the first configuration combinations to obtain a plurality of first frequency values of the output signal corresponding to the plurality of first configuration combinations, wherein for the plurality of first configuration combinations, the configuration selection module selects a plurality of third configuration values of the reference trimming device which make the frequency of the output signal close to a target frequency value and a plurality of second frequency values of the frequency of the output signal corresponding to the plurality of selected third configuration values, and records the plurality of first configuration combinations and the corresponding plurality of third configuration values into a plurality of second configuration combinations;
- and
- wherein when the temperature of the electronic device is a second temperature greater than the first temperature, the configuration selection module obtains a plurality of third frequency values of the output signal of the plurality of second configuration combinations, then calculates a plurality of frequency drift rates of the plurality of second configuration combinations based on the plurality of third frequency values and the plurality of second frequency values to select the second configuration combination with a smallest frequency drift rate, and the configuration selection module sets a plurality of configurations of the PTAT trimming device, CTAT trimming device and the reference trimming device based on the selected second configuration combination;
- and
- the output signal generating circuit.
8 more elements
Dependencies are inferred from the claim text.