MFV3D Book Archive > Electronics > Download Electronics 3 Checkbook. The Checkbooks Series by S.A. Knight, J.O. Bird and A.J.C. May (Auth.) PDF

Download Electronics 3 Checkbook. The Checkbooks Series by S.A. Knight, J.O. Bird and A.J.C. May (Auth.) PDF

By S.A. Knight, J.O. Bird and A.J.C. May (Auth.)

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Example text

When both inputs are employed, the unit behaves as a differential amplifier; for single-ended input, one or other of the differential inputs is earthed. An ideal model of an opamp would have the following characteristics: (a) an infinite voltage gain, (b) an infinite input impedance, (c) an infinite bandwidth, and (d) zero output impedance. No practical design can ever achieve this ideal but very good approximations can be made. Those opamps based on MOSFET technology approach the ideal conditions most closely, but even the types using bipolar transistors, such as the standard 741, have quite impressive figures.

5 V), V] is less than the reference level, hence the opamp output will be positive. Since the amplifier is operating at its very large open-loop gain value, any voltage difference at the inputs will drive it into saturation; hence the output will be at its maximum positive saturation value, just below the positive supply rail level. As soon as the slider of/?! passes the mid-point, vA will be greater than the reference level, hence the output will switch immediately to its maximum negative saturation level.

48 Problem 3 How might the basic inverting amplifier be modified for use as a summing amplifier? 6 If the basic inverting amplifier is modified to accept additional signal inputs and summing resistors are added, the circuit performs the mathematical operation of addition. 6 shows such a circuit system, and because of its ability to add, the virtual earth point is often referred to as the summing point. Let the input voltages bevuv2 and v3. )Rt -Rf Zi . Z i , 111 /?! R2 R3] If the three input resistors are equal in value and also equal to Rf, the output voltage will equal, literally, the sum of the input voltages.

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