10. ENG 282 ch5 a X - BASICELECTRICCIRCUITS...

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BASIC ELECTRIC CIRCUITS BASIC ELECTRIC CIRCUITS George Haines, Instructor George Haines, Instructor Chapter 5 Chapter 5 Pima Community College Start Date Chapter 5.10-5.5
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Today Chapter 5 Today Chapter 5 The Operational Amplifier The Operational Amplifier 5.1 Operational Amplifier Terminals 5.2 Terminal Voltages and Currents 5.3 The Inverting-Amplifier Circuit 5.4 The Summing-Amplifier Circuit
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http://www.pearsonhighered.com/nilsson/ Video Example Solutions
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5.1 Operational Amplifier In 1968 Fairchild Semiconductor introduced the µA741 op amp which has wide use. The terminals of primary interest are: inverting input noninverting input output positive power supply (V + ) negative power supply (V - ) Pins 1 & 5, the offset null terminals may be used in an auxiliary circuit to compensate for degradation in performance because of aging and imperfections which is, in most cases, negligible. Pin 8 is unused and therefore has no connection (NC).
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5.2 Terminal Voltages and Currents The voltage variables are measured from a common mode external to the op amp. All voltages are considered as voltage rises from the common node (Fig 5.4). Note that this convention is the same as used in the node-voltage method of analysis. The positive supply (V CC ) is connected between V + and the common node. A negative supply (-V CC ) is connected between V - and the common node. The voltage between the inverting input and the common node is designated v n . The voltage between the non-inverting input and the common node is designated v p . The voltage the between the output node and the common node is designated v 0 . The current variables with reference directions are shown in figure 5.5. Note that all the current reference directions are into the op amp.
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5.2 Terminal Voltages and Currents (Continued) The terminal of the op amp as a linear circuit element is characterized by constraints on the input voltages and the input currents. The voltage constraint is derived from the voltage transfer characteristics shown. / -V CC A(v p – v n ) < -V CC v o = < A(v p – v n ) -V CC >/= A(v p – v n ) </= + V CC \ +V CC A(v p – v n ) > + V CC When (|v p – v n |) is small, the op amp behaves as a linear device, as the output voltage is a linear function of the input voltages. Outside the linear region the, the op amp saturates, and the op amp
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This note was uploaded on 10/27/2010 for the course ECE 220 taught by Professor Strickland during the Spring '08 term at University of Arizona- Tucson.

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10. ENG 282 ch5 a X - BASICELECTRICCIRCUITS...

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