IC741

Operational Amplifier - IC 741 Tabish December 2005 Aim: To study the working of an 741 operational amplifier by conducting the following experiments: (a) Input bias current measurement (b) Input offset current measurement (c) Gain measurement in the inverting and non-inverting configurations (d) Set up the op-amp as an integrator. Apparatus: Component Operational amplifier kit Connecting leads Function generator CRO quantity 1 nos. 1 set. 1 nos. 1 nos. 1 Introduction The term operational amplifier or ”op-amp” refers to a class of high-gain DC coupled amplifiers with two inputs and a single output. The modern integrated circuit version is typified by the famous 741 op-amp. Some of the general characteristics of the IC version are: High gain, on the order of a million High input impedance, low output impedance Used with split supply, usually +/- 15V Used with feedback, with gain determined by the feedback network. The operational amplifier (op-amp) was designed to perform mathematical operations. Although now superseded by the digital computer, op-amps are a common feature of modern analog electronics. The op-amp is constructed from several transistor stages, which commonly include a differentialinput stage, an intermediate-gain stage and a push-pull output stage. The differential amplifier consists of a matched pair of bipolar transistors or FETs. The push-pull amplifier transmits a large current to the load and hence has a small output impedance. The op-amp is a linear ampli...