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
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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 configured to generate output data;
- and
- an arithmetic unit including a multiply adder and a non-restoring divider configured to correct the 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.
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, said x, y and z being input values of the multiply adder;
- substituting 1 for x2 and a result of the calculation xy-z for y2 and performing a calculation x2/y2 by the divider, said x2 and y2 being input values of the divider;
- substituting 1 for x3, the first reference voltage for y3, and the second reference voltage for z2 and performing a calculation (x3y3+z2)/2 by the multiply adder, said x3, y3 and z2 being input values of the multiply adder;
- substituting a result of the calculation x2/y2 for x4, a result of the calculation (x3y3+z2)/2 for y4, and 0 for z3 and performing a calculation −x4y4+z3 by the multiply adder, said x4, y4 and z3 being input values of the multiply adder;
- measuring a sensor output from a sensor by the analog-to-digital converter;
- and
- substituting the measured sensor output for x5, the result of the calculation x2/y2 for y5, and a result of the calculation −x4y4+z3 for z4 and performing a calculation x5y5+z4 by the multiply adder to correct the sensor output, said x5, y5 and z4 being input values of the multiply adder.
Dependencies are inferred from the claim text.