Microelectronic Circuits (The Oxford Series in Electrical and Computer Engineering) 7th edition
Microelectronic Circuits (The Oxford Series in Electrical and Computer Engineering) 7th edition
7th Edition
ISBN: 9780199339136
Author: Adel S. Sedra, Kenneth C. Smith
Publisher: Oxford University Press
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Chapter 7, Problem 7.48P
To determine

To find: The dc voltage at the collector current, value of re and the voltage gain vcvi .

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7.54 In the circuit shown in Fig. P7.54, the transistor has a ß of 200. What is the de voltage at the collector? Replacing the BJT with one of the hybrid-r models (neglecting r), draw the equivalent circuit of the amplifier. Find the input resistances R, and R, and the overall voltage gain (v,/v). For an output signal of ±0.3 V, what values of v and v, are required? +5 V +1.5 V ()I mA 10 k2 Rsig 1 kΩ Rc 1 kN Rin Rih Figure P7.54
b)The transistor consists of three terminals. The main reason for designing configurations is that it requires four terminals in order to provide the input and the output connections of the circuit for effective amplification. Now in your own words describe how Bipolar Transistors Transistor ( BJT ) various configurations are designed with relating diagrams. In your own estimation evalute which one is most widely used when looking at appreciable output for an amplifier?
*7.58 The transistor in the circuit shown in Fig. P7.58 is biased to operate in the active mode. Assuming that B is very large, find the collector bias current Ie. Replace the transistor with the small-signal equivalent-circuit model of Fig. 7.27(b) (remember to replace the de power supply with a short circuit). Analyze the resulting amplifier equivalent circuit to show that RE R +r. -aR. %3D v, R; +r, Find the values of these voltage gains (for a 2 1). Now, if the terminal labeled v, is connected to ground, what does the voltage gain v/v, become? +5 V Rc = 3.3 kN 100 kΩ 100 kΩ R = 3.6 kN Figure P7.58
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