BJT transistors Summary of DC problem 2 Bias transistors so that they operate in the linear region B-E junction forward biased, C-E junction reversed.

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Presentation transcript:

BJT transistors

Summary of DC problem 2 Bias transistors so that they operate in the linear region B-E junction forward biased, C-E junction reversed biased Use V BE = 0.7 (npn), I C  I E, I C =  I B Represent base portion of circuit by the Thevenin circuit Write B-E, and C-E voltage loops. For analysis, solve for I C, and V CE. For design, solve for resistor values (I C and V CE specified).

3 Summary of npn transistor behavior npn collector emitter base IBIB IEIE ICIC small current large current + V BE -

Transistor as an amplifier 4 Transistor circuits are analyzed and designed in terms of DC and ac versions of the same circuit. An ac signal is usually superimposed on the DC circuit. The location of the operating point (values of I C and V CE ) of the transistor affects the ac operation of the circuit. There are at least two ac parameters determined from DC quantities.

5 Small-signal equivalent circuit models ac model Hybrid-  model They are equivalent Works in linear region only

Steps to analyze a transistor circuit 6 1DC problem Set ac sources to zero, solve for DC quantities, I C and V CE. 2Determine ac quantities from DC parameters Find g m, r  and r e. 3ac problem Set DC sources to zero, replace transistor by hybrid-  model, find ac quantites, Rin, Rout, Av, and Ai.