A silicon diode ( ) is held at a steady bias current of by a bias network not shown

PHYSICS · Multi-part · Fermi University Physics · Electronics, Instrumentation & Communication · Semiconductor devices and analogue circuits · Semiconductor devices and analogue circuits

Electronics for Measurement, Ch The junction: an element whose current is exponential in its voltage

Problem

A silicon diode (

n=1

) is held at a steady bias current of

3.0\,\mathrm{mA}

by a bias network not shown, which presents a high impedance to any small signal. A signal generator delivers a

2.0\,\mathrm{mV}

peak sine wave through a

4.7\,\mathrm{k}\Omega

series resistor into the diode. Room temperature is

298\,\mathrm{K}

. ((a)) Predict the peak signal voltage that appears across the diode, using its small-signal resistance. ((b)) The same diode type is now used, four at a time, in a bridge rectifier fed from a

9.0\,\mathrm{V}

rms transformer secondary, each diode dropping

0.7\,\mathrm{V}

at its peak current. A

2200\,\mu\mathrm{F}

reservoir capacitor supplies a steady

150\,\mathrm{mA}

load. Predict the peak output voltage and the peak-to-peak ripple, both checkable on a bench with a multimeter and an oscilloscope. The mains frequency is

50\,\mathrm{Hz}

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