A silicon diode ( ) is held at a steady bias current of by a bias network that…

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

0.50\,\mathrm{mA}

by a bias network that presents a high impedance to any small signal. A

5.0\,\mathrm{mV}

peak sine wave is applied through a

10\,\mathrm{k}\Omega

series resistor into the diode, at

298\,\mathrm{K}

. ((a)) Predict the peak signal voltage that appears across the diode. ((b)) The same diode type is used as a single half-wave rectifier fed from a

6.0\,\mathrm{V}

rms transformer secondary, taking a

0.7\,\mathrm{V}

drop at its peak current, charging a

1000\,\mu\mathrm{F}

reservoir capacitor that supplies a steady

80\,\mathrm{mA}

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

50\,\mathrm{Hz}

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