Design a bandgap voltage reference circuit and a voltage-modifying circuit to provide precise voltage and current reference for the referred ADC.
设计了基准电压源和电压微调电路，为adc提供参考电压和电流，而且能进行一定范围内的微调。
The start-up circuit was design for the bandgap voltage reference circuit working normally.
另外设计了启动电路以确保基准电路能正常工作。
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