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    • 18. 发明授权
    • Reference circuit for providing precision voltage and precision current
    • 用于提供精密电压和精密电流的参考电路
    • US07880534B2
    • 2011-02-01
    • US12437699
    • 2009-05-08
    • Din-Jiun HuangKuan-Yu ChenYuan-Hsun Chang
    • Din-Jiun HuangKuan-Yu ChenYuan-Hsun Chang
    • G05F1/56G05F3/26
    • G05F3/30
    • A reference circuit for providing a precision voltage and a precision current includes a bandgap voltage reference circuit, a positive temperature coefficient calibrating circuit, a threshold voltage superposing circuit and precision current generator interconnected in cascade. From the bandgap voltage reference circuit, a bandgap voltage is outputted as the precision voltage, and a PTAT current is outputted to the positive temperature coefficient calibrating circuit along with the bandgap voltage for generating a PTAT voltage. In response to the PTAT voltage from the positive temperature coefficient calibrating circuit, the threshold voltage superposing circuit generates a first voltage which is equal to the PTAT voltage plus a threshold voltage. Then the precision current generator outputs a reference current as the precision current in response to the first voltage.
    • 用于提供精密电压和精密电流的参考电路包括级联的带隙电压参考电路,正温度系数校准电路,阈值电压叠加电路和精密电流发生器。 从带隙电压基准电路中,输出带隙电压作为精密电压,并且将PTAT电流与产生PTAT电压的带隙电压一起输出到正温度系数校准电路。 响应于来自正温度系数校准电路的PTAT电压,阈值电压叠加电路产生等于PTAT电压加上阈值电压的第一电压。 然后,精密电流发生器响应于第一电压输出参考电流作为精密电流。