Lecture 10_ Feb 9 2011 - Chapter 10 &13 Two Port...

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Unformatted text preview: Chapter 10 &13 Two Port Parameters and Hybrid Model Lecture 10 Covered Sections: 10.3, 13.1, 13.5 Introduction to Amplifiers BJT is used as an amplifier when biased in the forward-active region In this region, transistors can provide high voltage, current and power gains Bias is provided to stabilize the operating point in a desired operation region Q-point also determines Small-signal parameters of transistor Voltage gain, input resistance, output resistance Maximum input and output signal amplitudes Power consumption Chap 13.1 BJT Amplifier BJT is biased in active region by dc voltage source V BE . Q-point is set at ( I C , V CE ) = (1.5 mA, 5 V) with I B = 15 A. Total base-emitter voltage is: v BE = V BE + v be Collector-emitter voltage is: This is the load line equation. v CE = 10- i C R C Chap 13.1 BJT Amplifier (cont.) 8 mV peak change in v BE gives 5 A change in i B and 0.5 mA change in i C ....
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This note was uploaded on 03/06/2011 for the course ECE 255 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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Lecture 10_ Feb 9 2011 - Chapter 10 &13 Two Port...

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