| 主权项 |
1. A reference voltage circuit, comprising:
a constant voltage circuit, including
a Zener diode, anda bias current circuit connected in series with the Zener diode and causing a constant current to flow into the Zener diode,the constant voltage circuit being interposed between a reference potential and a power supply voltage, to thereby generate a predetermined breakdown voltage in the Zener diode; and
a resistance voltage divider circuit connected in parallel with the Zener diode to divide the breakdown voltage generated in the Zener diode, to thereby generate a reference voltage, wherein the resistance voltage divider circuit includes first and second resistors connected in series, the first resistor is connected to a cathode side of the Zener diode, and is formed of a low temperature coefficient resistor body that is temperature-independent, and the second resistor is connected to an anode side of the Zener diode, and is formed of a resistor body having temperature characteristics that are the reverse of output temperature characteristics of the Zener diode, wherein the temperature characteristics of the resistor body include a resistance value of the resistor body at each temperature in a range of temperatures, and the output temperature characteristics of the Zener diode include the breakdown voltage generated in the Zener diode at each temperature in the range of temperatures. |
