Sensor output correction circuit, sensor output correction device, and sensor output correction method
AssigneeMitsumi Electric Co., Ltd.
InventorsKonosuke YAMAMOTO, Yoichi KIMURA
Life of this patent
Estimating the term…
Abstract
A sensor output correction circuit includes an analog-to-digital converter configured to receive an input voltage corresponding to a sensor output of a sensor and a reference voltage that are selectively input to the analog-to-digital converter; and an arithmetic unit configured to correct output data, which is output from the analog-to-digital converter when the input voltage is input to the analog-to-digital converter, based on an output value that is output from the analog-to-digital converter when the reference voltage is input to the analog-to-digital converter. The arithmetic unit includes a multiply adder and a non-restoring divider.
Claims7
A sensor output correction circuit, comprising:
- an analog-to-digital converter configured to receive an input voltage corresponding to a sensor output of a sensor and a reference voltage that are selectively input to the analog-to-digital converter;
- and
- an arithmetic unit configured to correct output data, which is output from the analog-to-digital converter when the input voltage is input to the analog-to-digital converter, based on an output value that is output from the analog-to-digital converter when the reference voltage is input to the analog-to-digital converter,
- wherein the arithmetic unit includes a multiply adder and a non-restoring divider.
A method performed by a sensor output correction circuit including an analog-to-digital converter, a multiply adder, and a non-restoring divider, the method comprising:
- measuring a first reference voltage by the analog-to-digital converter;
- measuring a second reference voltage by the analog-to-digital converter;
- substituting 1 for x, the first reference voltage for y, and the second reference voltage for z and performing a calculation xy-z by the multiply adder;
- substituting 1 for x and a result of the calculation xy-z for y and performing a calculation x/y by the divider;
- substituting 1 for x, the first reference voltage for y, and the second reference voltage for z and performing a calculation (xy+z)/2 by the multiply adder;
- substituting a result of the calculation x/y for x, a result of the calculation (xy+z)/2 for y, and 0 for z and performing a calculation -xy+z by the multiply adder;
- measuring a sensor output from a sensor by the analog-to-digital converter;
- and
- substituting the measured sensor output for x, the result of the calculation x/y for y, and a result of the calculation −xy+z for z and performing a calculation xy+z by the multiply adder to correct the sensor output.
Dependencies are inferred from the claim text.