(电子电路基础专业英语）1-Operational Amplifier.ppt

Operational Amplifier and Applications Group members: Shiyu Yang; Xinxin Wang; Qun Qi; Zikang Wei; Limei Ye; Lijin Deng. Contents: Introduction Classification Applications Operational amplifier is able to perform mathematical operations on the signal amplification circuit. 1. Introduction 2. Classification Ideal operational amplifier Real operational amplifier Classification --- Ideal operational amplifier It produces an output voltage that is the difference between the two input terminals,multiplied by the gain A. Classification --- Ideal operational amplifier Properties: Infinite open-loop gain?(?A =?vout?/ vin ) Infinite input impedance Rin , and zero input current Zero input offset voltage Zero output impedance voltageRout Infinite Common-mode rejection ratio(CMRR) Classification --- Real operational amplifier Properties: Limited Common-mode rejection ratio(CMRR) Non-Zero input offset voltage Non-Zero input offset current 3. Applications of Operational Amplifier --- Inverting amplifier The existence of virtual to reverse phase is amplifier circuit in the closed loop work state of the important characteristics. Applications --- Non-inverting amplifier In the same phase amplifier circuit, the same in phase in closed loop work state of the important characteristics. Applications --- Voltage follower It is often as impedance transformer or buffer in circuit. The end Thank you !!! Operational Amplifier and Applications