Electrical Circuits and Electronics课件（华南理工）Lecture 35-36.pptVIP

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Electrical Circuits and Electronics课件（华南理工）Lecture 35-36.ppt

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Electrical Circuits and Electronics School of Electric Power Electrical Circuits and Electronics School of Electric Power Electrical Circuits and Electronics School of Electric Power Electrical Circuits and Electronics School of Electric Power Electrical Circuit and Electronics School of Electric Power Electrical Circuit and Electronics School of Electric Power Electrical Circuit and Electronics School of Electric Power Electrical Circuit and Electronics School of Electric Power Electrical Circuit and Electronics School of Electric Power Electrical Circuit and Electronics School of Electric Power Electrical Circuit and Electronics School of Electric Power Electrical Circuit and Electronics School of Electric Power Chapter 12 Operational Amplifiers Aim List the characteristics of ideal op amps; Select op-amp circuit configurations suitable for various applications; Apply integrators, differentiators, and active filters. Operational Amplifier An operational amplifier is a circuit composed of perhaps 30 BJTs or FETs, 10 resistors and several capacitors; Op-amps originated in analog-computer circuits. Ideal Operational Amplifiers Common-mode signal (average of the input voltages): Differential signal Lecture 35 Common-Source Amplifiers and Source Followers Ideal Operational Amplifiers Infinite input impedances; Infinite gain for the differential input signal; Zero gain for the common-mode input signal; Zero output impedance; Infinite bandwidth; Inverting Amplifiers Verify that negative feedback is present; Assume that the differential input voltage and the input current of the op-amp are forced to zero (summing-point constraint); Apply standard circuit-analysis principles. Basic Inverter Assume that the differential input voltage and the input current of the op-amp are forced to zero: Therefore: 0 Virtual-Short-Circuit Concept Even though the differential input voltage of the op-amp is forced to zero, the op-amp input current is also zero; It is the action at the outp