Offset voltage calibration method and apparatus and amplifier thereof
AssigneeAnpec Electronics Corporation
InventorsYu-Chen Chiang, Ming-Hung Chang, Fu-Yuan Chen
Life of this patent
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Abstract
An offset voltage calibration method is disclosed, which is utilized for calibrating an offset voltage of an electronic device during a calibration period. The offset voltage calibration method includes generating a control signal according to an output signal of the electronic device, counting a count value and generating an offset indication signal according to the control signal, stopping counting and generating a final count value according to a compensation value after the output signal changes state, generating a calibration signal according to the count value or the final count value, and calibrating the offset voltage according to the offset indication signal and the calibration signal.
Claims29
An offset voltage calibration method for calibrating an offset voltage of an electronic device during a calibration period, the offset voltage calibration method comprising:
- generating a control signal according to an output signal of the electronic device;
- counting a count value and generating an offset indication signal according to the control signal;
- stopping counting the count value and adjusting the count value according to a compensation value to generate a final count value after the output signal changes state;
- generating a calibration signal according to the count value or the final count value;
- and
- calibrating the offset voltage according to the offset indication signal and the calibration signal.
An offset voltage calibration apparatus for calibrating an offset voltage of an electronic device during a calibration period, the offset voltage calibration apparatus comprising:
- a logic control unit for generate a control signal according to an output signal of the electronic device;
- a counting unit coupled to the logic control unit for counting a count value and generating an offset indication signal according to the control signal, stopping counting the count value and adjusting the count value according to a compensation value to generate a final count value after the output signal changes state;
- a calibration signal generation unit coupled to the counting unit for generating a calibration signal according to the count value or the final count value;
- and
- a regulating unit coupled to the counting unit, the calibration signal generation unit, and the electronic device for calibrating the offset voltage according to the offset indication signal and the calibration signal.
An amplifier capable of auto-calibrating offset voltage, comprising:
- an input stage comprising a first input end and a second input end for receiving a common mode voltage signal respectively during a calibration period;
- a gain stage circuit coupled to the input stage for generating an output signal according to the common mode voltage signal received by the first input end and the second input end;
- and
- an offset voltage calibration apparatus for calibrating an offset voltage of the amplifier device during the calibration period, the offset voltage calibration apparatus comprising:
- a logic control unit coupled to the gain stage circuit for generating a control signal according to the output signal;
- a counting unit coupled to the logic control unit for counting a count value and generating an offset indication signal according to the control signal, stopping counting the count value and adjusting the count value according to a compensation value to generate a final count value after the output signal changes state;
- a calibration signal generation unit coupled to the counting unit for generating a calibration signal according to the count value or the final count value;
- and
- a regulating unit coupled to the counting unit, the calibration signal generation unit, and the gain stage circuit for calibrating the offset voltage according to the offset indication signal and the calibration signal.
Dependencies are inferred from the claim text.