| 摘要 |
An air meter is provided which enables the improvement of accuracy of internal reference voltages with few IC terminals. A band gap reference power supply circuit <bold>6 </highlight>supplies an internal reference voltage to a characteristic adjusting circuit <bold>4 </highlight>and an internal reference voltage VINT to a multiplier circuit <bold>5. </highlight>the band gap reference power supply circuit <bold>6 </highlight>comprises a temperature current generating circuit <bold>21 </highlight>for generating a current proportional to a temperature, a current mirror circuit for duplicating the current of the temperature current generating circuit <bold>21, </highlight>a reference voltage generating circuit <bold>23 </highlight>through which the current duplicated by the current mirror circuit <bold>22 </highlight>is caused to be flowed to generate the internal reference voltage ES, and a reference voltage generating circuit <bold>24 </highlight>through which the current duplicated by the current mirror circuit <bold>22 </highlight>is caused to be flowed to generate the internal reference voltage VINT.
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