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一、电路的特点和简单工作原理仿μA741是一种通用型高增益运算放大器,与一般运算放大器比较,这种放大器具有增益高、输入阻抗高、补偿简单(只需外接一只30Pf电容)、共模电压范围大和输出幅度大等特点,所以使用方便、可靠。它可用于各种运算电路、电压比较器、直流放大器、电压电流变换器、伺服控制放大器、模数转换器、锁相环直流放大器及各种有源滤波器等,因此使用方便,用途较广。目前在Ⅲ型电动单元组合仪表上已推广使用。此电路基本上可分为四个组成部分,即差分输入级、中间放大级、输出级,以及供给各级偏置电流的偏置电路。输入级由T_1T_3和T_2T_4组成差分对,T_1和T_2是NPN型组成的射极输出器,T_3和T_4是
First, the circuit characteristics and simple working principle Imitation μA741 is a general-purpose high-gain operational amplifier, compared with the general operational amplifier, this amplifier has high gain, high input impedance, simple compensation (only an external 30Pf capacitor) Common mode voltage range and large output amplitude and so on, so easy to use and reliable. It can be used in a variety of computing circuits, voltage comparators, DC amplifiers, voltage-current converters, servo-control amplifiers, analog-digital converters, DC-phase-locked loop amplifiers and a variety of active filters, . Currently in the Ⅲ type electric unit combination meter has been widely used. This circuit can basically be divided into four components, namely, differential input stage, the middle amplifier stage, the output stage, as well as supply bias current bias circuit at all levels. The input stage consists of a differential pair T_1T_3 and T_2T_4, T_1 and T_2 are emitter emitters of NPN type, T_3 and T_4 are