Finding the signal component of the output voltage


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Q: In the circuit shown in Fig, I is a dc current and vs is a sinusoidal signal. Capacitors C1 and C2 are very large; their function is to couple the signal to and from the diode but block the dc current from flowing into the signal source r the load (not shown). Use the diode small-signal model to show that the signal component of the output voltage is

vo=vs(Vr/(Vr+IRs)

If vs = 10 mV, find vo for I = 1 mA, 0.1 mA, and 1 μA. Let Rs =1 Ω. At what value of I does vo become one-half of vs? Note that circuit functions as a signal attenuator with the attenuation factor controlled by the value of the dc current I.

994_Circuit.jpg

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Electrical Engineering: Finding the signal component of the output voltage
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