Basics of electronic ...

Exercise 1:

Determine the input characteristics of a common-emitter transistor for collector-emitter voltages of 0V and 5V. Show the base current versus the base-emitter voltage (\(I_B = f(U_BE)\)). Use BC547A transistor model:

.model bc547a NPN BF=400 NE=1.3 ISE=10.3F IKF=50M IS=10F VAF=80 ikr=12m BR=9.5 NC=2 VAR=10 RB=280 RE=1 RC=40 VJE=.48 tr=.3u tf=.5n cje=12p vje=.48 mje=.5 cjc=6p vjc=.7 isc=47p kf=2f

When you're done, compare the result with the video below.

Exercise 2:

Determine the output characteristics of the transistor for the base currents \(30 \mu A\), \(60 \mu A\) and \(90 \mu A\) i.e. the collector current as a function of the collector-emitter voltage (\(I_C = f(U_ {CE})\)), setting the voltage in the range from 0 to 10V. When you're done, compare the result with the video:

Exercise 3:

Build an voltage amplifier using the BC547A transistor, setting the operating point of the transistor so that the base current is \(60 \mu A \). The supply voltage is 10V. Select the collector resistor of the transistor so that the collector voltage at the operating point is half the supply voltage. Apply a sine wave of 10 mV amplitude and 1 kHz frequency through the capacitor \(100 \mu F \) to the base of the transistor. Connect a capacitor \( 100 \mu F \) and a load resistor \( 1 M\Omega \) to the collector to test the output signal. Observing the signals on the time plot, study the gain of the transistor amplifier circuit. When you're done, compare the result with the video: