| 摘要 |
A reference potential converter circuit comprises: a first resistor (resistance value R1) serving as a feedback resistor for an operational amplifier; a second resistor (resistance value R2) connected to the first resistor and a reference voltage; and a third resistor (reference value R3) and a fourth resistor (reference value R4) connected between a power supply and ground. A difference voltage between Vout and Vref is divided by an R1/R2 ratio and applied to an inverting input terminal of the operational amplifier. A power supply voltage is divided by an R3/R4 ratio and applied to a non-inverting input terminal of the operational amplifier. The R1/R2 ratio and the R3/R4 ratio are equal.
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