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    • 2. 发明申请
    • BANDGAP REFERENCE CIRCUIT
    • 带宽参考电路
    • US20090051342A1
    • 2009-02-26
    • US12195061
    • 2008-08-20
    • YAN-HUA PENGUEI-SHAN UANGCHIA-WEI CHANG
    • YAN-HUA PENGUEI-SHAN UANGCHIA-WEI CHANG
    • G05F3/16
    • G05F3/30
    • A bandgap reference circuit includes an input circuit having a first FET, a second FET, and a first resistor, wherein a first node is connected to the first FET having a first threshold voltage, the first resistor is connected between a second node and the second FET having a second threshold voltage; a mirroring circuit for controlling two output currents respectively derived from the first and second nodes, and maintaining the two output currents to a specific current ratio; and an operation amplifier connected to the first node, the second node of the input circuit, and the mirroring circuit, for controlling two voltages respectively at the first and second nodes of the input circuit to a specific voltage ratio; wherein the first FET and the second FET are both operating in the subthreshold region, the first threshold voltage is larger than the second threshold voltage, and the two output currents are independent of temperature.
    • 带隙参考电路包括具有第一FET,第二FET和第一电阻器的输入电路,其中第一节点连接到具有第一阈值电压的第一FET,第一电阻器连接在第二节点和第二节点之间 具有第二阈值电压的FET; 用于控制分别从第一和第二节点导出的两个输出电流并将两个输出电流保持为特定电流比的镜像电路; 以及连接到第一节点,输入电路的第二节点和镜像电路的运算放大器,用于将输入电路的第一和第二节点处的两个电压分别控制到特定电压比; 其中所述第一FET和所述第二FET都在所述亚阈值区域中操作,所述第一阈值电压大于所述第二阈值电压,并且所述两个输出电流与温度无关。