IC741 데이터 시트보기 (PDF) - Unspecified
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IC741 Datasheet PDF : 7 Pages
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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now superseded by the digital computer, op-amps are a common feature of modern analog electron-
ics.
The op-amp is constructed from several transistor stages, which commonly include a differential-
input 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 amplifier with Vout ∝ Vinp. The DC open-loop voltage gain of a typical
op-amp is 103 to 106. The gain is so large that most often feedback is used to obtain a specific
transfer function and control the stability.
Cheap IC versions of operational amplifiers are readily available, making their use popular in any
analog circuit. The cheap models operate from DC to about 20 kHz, while the high-performance
models operate up to 50 MHz. A popular device is the 741 op-amp. It is usually available as an IC
in an 8-pin dual, in-line package (DIP).
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