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By Walt Jung

Operational amplifiers play an essential function in smooth electronics layout. the newest op amps have robust new positive aspects, making them improved to be used in lots of items requiring susceptible sign amplification, resembling clinical units, communications expertise, optical networks, and sensor interfacing. The Op Amp functions instruction manual could be the last word op amp reference publication on hand. This ebook is brimming with Read more...

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For example, signal-to-noise (SNR) performance degrades as a result of reduced signal swing. "Ground reference" is no longer a simple choice, as one reference voltage may work for some devices, but not others. Amplifier voltage noise increases as operating supply current drops, and bandwidth decreases. Achieving adequate bandwidth and required precision with a somewhat limited selection of amplifiers presents significant system design challenges in single-supply, low power applications. Most circuit designers take "ground" reference for granted.

28 Op Amp Basics m Op Amp Topologies References: Op Amp Topologies 1. Wyn Palmer, Barry Hilton, "A 500 V/~ts 12-Bit Transimpedance Amplifier," ISSCC Digest, February 1987, pp. 176-177, 386. 2. Frederick E. Terman, "Feedback Amplifier Design," Electronics, January 1937, pp. 12-15, 50. 3. Edward L. Ginzton, "DC Amplifier Design Techniques," Electronics, March 1944, pp. 98-102. 4. Stewart E. Miller, "Sensitive DC Amplifier with AC Operation," Electronics, November 1941, pp. 27-31, 105-109. 5. O. Edson and H.

Another method of reducing bias current is by the use of superbeta transistors for Q l-Q2. Superbeta transistors are specially processed devices with a very narrow base region. They typically have a current gain of thousands or tens of thousands (rather than the more usual hundreds). Op amps with superbeta input stages have much lower bias currents, but they also have more limited frequency response. Since the breakdown voltages of superbeta devices are quite low, they also require additional circuitry to protect the input stage from damage caused by overvoltage (for example, they wouldn't operate in the circuit of Figure 1-22).

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