Find I4 in figure 7-20, using the parameters given in problem 7-7 Circuits such

Question

Find I4 in figure 7-20, using the parameters given in problem 7-7

Circuits such as Figure 7 19 are used in many medical instrument to a value (i f.. from several different input value It is also possible to use die noninverting input. in which ease no polarity inversion takes place, and Equation 7-17 must be modified to reflect the contribution of signals applied to the non- inverting input equation (Equation 7-11). A differential .amplifier (diff-amp) produces an output voltage that is proportional to die difference between tin; voltage applied to the two input terminals. Since an operational amplifier have a part of differential input terminals, ii may be easily connected for use in a differential amplifier In the most elementary form of dc differential amplifier (Figure 7-20) only a single 1C opera­tional amplifier is In this circuit. the Voltage gain for differentia signals for Figure 7 21 shows differential input amplifier circuit detail. Depicted is the external circuit and some internal "guts'' of die dill-amp. which it really just an op-amp. All op-amps have plus and minus bias current(I_b + I_b^-), output load current internal common mode and differential resistance and capacitance, and output resistance, k_0 of course, the ground reference is actually the point between the power supplier.

Explanation / Answer

IN series resistance , current is same there fore current I4 at resistance R4 will be equal to current I3 at resistance R3 . Since Vout is grounded between the terminals of R4 .

Thus current I4 = Vin/R4

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