带隙基准电压源之所以是模拟电路中重要的模块，是因为它能够提供近似恒定的参考电压，这个电压不随温度，电源电压，工艺的变化而变化。
Bandgap reference voltages are important analog circuit blocks. It can provide a nearly constant reference voltage which is stabilized over process, power supply and temperature variation.
恒定电流源可以避免因输入电压的波动使LED的驱动电流波动并维持LED的亮度不变。
Constant current source can avoid the fluctuations of output current due to the fluctuations of input voltage, and maintain the brightness of LED.
设计了一种可程控功率源，其特点是可输出大功率的恒定电流和恒定电压，波形参数和输出变化方式可由程序控制输出；
The system is so designed and then the key ICs are choose carefully. A controllable power source is designed in this paper.
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