| 摘要 |
PROBLEM TO BE SOLVED: To provide a D/A converter circuit with satisfactory linearity of an output voltage with respect to a received digital value, in spite of a comparatively low cost and to correct an offset of a pressure sensor circuit by using the D/A converter circuit with high accuracy. SOLUTION: A constant current circuit consisting of a current mirror circuit is configured with an operational amplifier OP1, MOSFETs Q1, Q2, a resistor R3 and an R-2R ladder circuit 1. Thus, a drain current in response to a digital value received by the R-2R ladder circuit 1 flows into the MOSFET Q2. A source current of the MOSFET Q2 is given to a current-voltage conversion circuit 4, which outputs a voltage in response to the received digital value.
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