在许多测试场合，传感器输出的信号往往很微弱，而且伴随有很大的共模电压（包括干扰电压），一般对这种信号需要采用测量放大器。测量放大器是一种高增益、直流耦合放大器，它具有差分输入、单端输出、高输入阻抗和高共模抑制比等特点。请设计一个测量放大器：

指标要求：

a.当输入信号峰峰值uip-p=1mV时，输出电压信号峰峰值uop-p=1V。

b.输入阻抗：Ri>1MΩ

c. 频带宽度： Δf（-3dB）=1Hz~1kHz

d.共模抑制比： CMRR > 70dB

-In many testing situations, the sensor output signal is often very weak, and with a large common mode voltage (including the interference voltage), generally requires the use of this signal measuring amplifier. Measuring amplifier is a high-gain, DC-coupled amplifier, it has a differential input, single-ended output, high input impedance and high common mode rejection ratio and so on. Please design a measuring amplifier: the indicator: a. When the input signal peak-uip-p = 1mV, the output voltage signal peak uop-p = 1V. b. Input impedance: Ri>　1MΩ c. bandwidth: Δf (-3dB) = 1Hz ~ 1kHz d. common mode rejection ratio: CMRR>　70dB