测控专业英语

The introduction and application of signal amplification circuit

(信号放大电路的简介及应用)

Signal amplification circuit,also called amplifier,it ’s used to amplification a weak signal sensor without distortion.(信号放大电路的定义)

In order to match the sensor circuit or basic conversion circuit,we make the amplifier to have high input impedance.In generally,The most simple and common high input impedance of the amplifier is in-phase input amplifier,the output voltage 0U and input impedance Z are:

i f

O U R R U )1(1+=

1

1R R AdZ Z f i += （高输入阻抗放大器的0U 和Z ）

Ad is differential mode of operation amplifier amplification i Z is open loop input impedance.(Ad 、i Z 的含义)

In order to ensure the common mode rejection ratio make:

4

211R R R R f f = And the amplifier output is:

))(1(1242

0U U R R U f -+=

The output and input relationship of two operational amplifiers 1N and 2N is:

i U R R U ）（1

20-= i U U R R U 2)2(

02101=-= The output of the signal source current is:

i i i i U R

R R U U R U I I I )11(10111-=-==-=

(放大器输出电压及电流的推导)

The signal amplifying circuit can be applied to many occasions.Such as capacitance sensor,sensor and inductance sensor in some high precision of measurement and control system.(常见应用)

测控1602曹伟伦50号

1240301160250