By James A. Blackburn
This contemporary presentation comprehensively addresses the valuable concerns in sleek instrumentation, yet with out trying an encyclopaedic reference. It covers an important subject matters in electronics, sensors, measurements and acquisition platforms, and may be an crucial reference for readers in a wide selection of disciplines.
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2. If this op-amp is used in a noninverting configuration with RF = 40 K and R1 = 10 K, what will be the closed-loop gain and bandwidth? [Ans. 5 and 300,000 Hz]. C H A P T E 6 R Special-Purpose Circuits In the previous chapter, the basic properties of operational amplifiers were sum marized, and a number of standard configurations were discussed. It was shown, for example, that very simple arrangements of a few resistors in combination with an op-amp could provide noninverting or inverting amplification.
Ac bridge with four impedances and ac excitation. 4. Capacitance bridge. these expressions yields the condition for balance: Z1/Z3 = Z2/Z4. 14) The composition of possible "unknowns" is endless, but a few examples will illustrate the basic principles involved. Nonideal Capacitance Suppose the unknown component is a lossy capacitor, represented as an ideal capacitance Cx shunted by a resistance Rx. The bridge arrangement is shown in Fig. 4. In practice, the bridge is balanced by varying both the capacitor C\ and the resistor R1 until no ac signal is detected across the bridge output nodes.
Equating the right-hand sides of Eqs. 28) Hence, the output voltage is a weighted difference of the input voltages. 29) Vout = k (Vb - Va). 30) then In other words, this specific condition on the resistor ratios yields an output which is just a constant times the difference in the input voltages. 4 SUMMING AMPLIFIER As a final important and useful configuration, consider the circuit shown in Fig. 10. 10. Summing amplifier based on a single op-amp. 31) Again, the equality of potentials at the inverting and noninverting inputs is invoked: V+ = V - .