(a) Explanation Given Information: Output voltage of the op-amp with no input applied (grounded) V o s = 5 V Output voltage with input open V o o = 5.3 V R 2 = 10 M , R 1 = 100 k Calculation: An inverting based op-amp circuit is shown below. The op-amp has certain dc imperfections some of them being input offset voltage, input bias currents and input offset current. In practical cases, the dc current at the input terminals of the op-amp is nonzero without any input applied. This accounts for bias currents, and there are two bias current components at the respective terminals of the op-amp, the average of which gives the bias current for the op-amp. The two bias currents can be taken as equal for simplicity. Hence I B 1 = I B 2 = I B The difference between the two bias current components is called input offset current. The inverting amplifier with the given specifications is shown above. Here two cases are considered at the inverting terminal Open input Grounded input With the open-circuited input - The bias current I B flows through R 2 to the output since the op-amp is having very high internal resistance. This current is given by I B = V o − V + R 2 V o = V + + I B R 2........ ( 1 ) . V + is the voltage at the noninverting terminal, and it can be considered as the voltage at the junction X using the property of virtual ground, which implies the voltage difference between the two terminals to be ideally zero. Here the voltage V + = V i o s due to the input offset voltage. With the grounded input- the input-output relation can be written as V o s = V + + R 2 I B + V i o s R 1 R 2 = ( 1 + R 2 R 1 ) V i o s + I B R 2............ ( 2 ) Solving these two equations gives input bias current. V o o = V + + I B R 2........ ( 1 ) = V i o s + I B R 2 5 (b) To determine Input offset voltage of an op-amp in inverting configuration (c) To determine Input offset current of the inverting amplifier

Microelectronic Circuits (The Oxford Series in Electrical and Computer Engineering) 7th edition

7th Edition

ISBN: 9780199339136

Author: Adel S. Sedra, Kenneth C. Smith

Publisher: Oxford University Press

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Operational Amplifier

An operational amplifier also called op amp is an integrated circuit or analog circuit that takes input as a differential voltage and produces output as a single-ended voltage. It is an IC that can amplify weak electric signals.An op amp has one output p…

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Chapter 2, Problem 2.98P

(a)

To determine

Bias current of the inverting amplifierand its direction of flow.

(b)

To determine

Input offset voltage of an op-amp in inverting configuration

(c)

To determine

Input offset current of the inverting amplifier

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Chapter 2, Problem 2.97P

Chapter 2, Problem D2.99P

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Chapter 2 Solutions

Microelectronic Circuits (The Oxford Series in Electrical and Computer Engineering) 7th edition

Ch. 2.1 - Prob. 2.1E Ch. 2.1 - Prob. 2.2E Ch. 2.1 - Prob. 2.3E Ch. 2.2 - Prob. D2.4E Ch. 2.2 - Prob. 2.5E Ch. 2.2 - Prob. 2.6E Ch. 2.2 - Prob. D2.7E Ch. 2.2 - Prob. D2.8E Ch. 2.3 - Prob. 2.9E Ch. 2.3 - Prob. 2.10E

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