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Design With Operational Amplifiers And Analog Integrated Circuits (McGraw-Hill Series In Electrical And Computer Engineering) Series: McGraw-Hill Series in Electrical and Computer Engineering

Hardcover: 736 pages

Publisher: McGraw-Hill Education; 4 edition (January 24, 2014)

Language: English

ISBN-10: 0078028167

ISBN-13: 978-0078028168

Product Dimensions: 7.3 x 1.3 x 9.2 inches

Shipping Weight: 2.7 pounds (View shipping rates and policies)

Average Customer Review: 4.2 out of 5 stars See all reviews (4 customer reviews)

Best Sellers Rank: #462,160 in Books (See Top 100 in Books) #143 in Books > Engineering & Transportation > Engineering > Electrical & Electronics > Circuits > Design #903 in Books > Engineering & Transportation > Engineering > Electrical & Electronics > Electronics #89994 in Books > Textbooks

A cursory examination of this book reveals a few disappointing errors that, to be fair, are common, at least in part, in other books on the subject:1) The author neglects to mention that the 741 has a typical gain of 200V/mV only at DC.2) The author incorrectly refers to the amplifier’s forward path gain “a” as the “open loop gain”. This is wrong because the open loop gain is, in fact, the gain round the opened feedback loop. Indeed, the open loop gain is more commonly referred to as the loop gain. A quick perusal of any feedback control theory textbook should disabuse doubters of this common fallacy.3) The author states, wrongly, that an op amp should ideally have an infinitely large gain. Never mind that an infinitely large forward path gain is not physically realisable, but this is false precisely because the error voltage required to drive the amplifier’s forward path, and, therefore, generate the output voltage, becomes zero when the forward path gain is infinite. This means the negative feedback would be completely unable to control the amplifier’s output voltage by controlling the error voltage which is permanently fixed at zero volts while the output saturates at one of the supply rails. Therefore, an ideal op amp should have a forward path gain which only approaches or tends to infinity without actually being equal to infinity.4) The author further states that the negative feedback delivers whatever voltage is required to drive the ideal op amp’s error voltage to zero. This is not true, even in the ideal case, because with a zero error voltage the forward path’s infinite gain will deliver an infinite output voltage.

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