Measure and record below the times ton and tom ton = 69_S_ toff Time ton is the sum of td and tr, and toff is the sum of ts andRefer to your text for descriptions of these BJT switch times. This will simplifyyour measurements a bit, yet still serve to verify and illustrate the time delays in Your measurement of the transistor switch timing willīe the measure of the times too and Toff as shown in Figure. Your oscilloscope display should resemble thetheĭiagram of Figure below. Or - trigger levels and use the sweep multiplier to obtain the measurements offollowing Procedure steps. Adjust the oscilloscope to trigger on channel 1, and adjust thesweep timing to display 1 cycle of input signal. The input signal levels at RR should be close to +5 V and 0 V.Ĭonnect a dual-trace oscilloscope channel 1 to the signal input at RB andchannel 2 to the switch output at the collector of the transistor. Set the generator for an outputfrequency of Connect the signal input to your switch circuit. Since its square wave output swings from a negative level to a positive leveloperating around a O-V reference. Transitions from 0 V to approximately +5 V and back your signal generatoroperating with a square wave output will not deliver the required waveform The input signal needs to be a square wave thatsponse In the following Procedure steps you will measure the transistor switch retimes to a square wave input. Vc is low so we can conclude that it exists in the saturated region. Transistor acts as a switch ,in this circuit as 0 something voltage is providthe transistor will turn on and Ic flows through the collector which is 6 anded so Voltage measurements should indicate that the transistor is saturated observations, would you say that BJT is behaving like a switch. Do not apply an input signal at this time. Have experimentally verified OR, AND Logic through BJT. Be able to relate measured circuit parameters to failed components. Know how to improve the switching speeds of a BJT switch using speed-upcapacitors. Have experimentally verified the switching speed limitations of a transiswitch. Be able to determine whether a BJT is operating correctly as a switch. Lab # 10 BJT as a Switch (Logic gates) OBJECTIVES:Īfter completing this experiment you will:
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