没有反馈电阻的仪表放大器提供精确增益，无论增益多大，放大器的同向和反向输入端提供高输入阻抗。

An instrumentation amplifier offers precise gain without feedback resistors, and, at any value of gain, it provides high input impedances at its noninverting and inverting inputs.

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设计了基于TL 431和电阻网络的精密反馈电路，以满足电源输出电压幅值高，精度高的要求。

And a precise feedback circuit based on TL431 and resistors network is devised to meet the requirements of high voltage and high precision of the power supply.

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