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# 4.68 Using the exponential diode characteristic, show that for v S and v O both greater than zero, the circuit of Fig. 4.23(a) has the transfer characteristic v O = v S −v D at i D = 1 mA −V T ln v O /R where v S and v O are in volts and R is in kilohms. Note that this relationship can be used to obtain the voltage transfer characteristic v O vs. v S by finding v S corresponding to various values of v O .

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