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Ece 222 lab frequency limits

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UNIVERSITY OF SOUTHERN MINDANAO LABORATORY EXERCISE Frequency Limits Geraldo P. Ulep Professional Electronics Engineer Subject Professor College of Engineering and Information Technology Department of Electronics Engineering Intended Learning Outcomes • (CO1) Review the basic electronics learned in Electronics 1 • (CO2) Analyze different circuits and models at high frequency • (CO3) Analyze and solve transistor circuit problems Frequency Limits Objective • This exercise focuses on the analysis of the frequency limits of a transistor amplifier. The elements contributing to both the lower and upper limits of frequency performance are examined, thus defining the midband region of the circuit. Theory Overview • As the signal frequency extends to very high or very low frequencies, capacitive effects on gain can no longer be ignored or idealized as shorts or opens. At low frequencies, coupling and bypass capacitors in conjunction with surrounding resistance create lead networks that cause a reduction in voltage gain. At higher frequencies, small shunting capacitances associated with individual devices circuit wiring create lag networks. These will also create a reduction in voltage gain. In general, the highest critical frequency among the lead networks creates the amplifier’s lower limit frequency, f1. In contrast, the lowest critical frequency among the lag networks creates the amplifier’s upper limit frequency, f2. These points are defined as the half-power ...
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