ES 230 Electronics I
Test 2
Date: 4.1.14
General comment: you are responsible for all of the materials covered during the lectures/labs.
Chapter 4:
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Structure of Bipolar transistor (npn and pnp)
Different modes of operations: active mode, saturation mode, and cut-off mode.
Concept of transconductance and output resistance.
Small signal model (npn and pnp)
Early effect.
Chapter 5:
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Concept of input/output resistance
Difference between DC analysis and small signal analysis.
Biasing (solve via iteration)
Bipolar amplifier topologies: common-emitter, common-collector, and common-base.
o Voltage gain
o Input and output resitsance
Multi-stage design.
Assignments:
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Homework #3, homework #4, homework #5, homework 6.
Notes:
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You will not need a calculator for this test.
No cheat sheet.
No make-up test.
Equations
 Know Ohm’s law, voltage divider formula, current divider formula, definition of voltage gain, KCL, and KVL.
 Please memorize the exponential model equation for the bipolar junction transistor.
 Know the formulas for terminal resistance.
 Know the formulas for gain.
 Know all of the formulas we have reviewed on 3. 25. 14.
Problem:
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Operation of the bipolar junction transistor in the active mode (15 points)
Operation of the bipolar junction transistor in the saturation mode (10 points)
Biasing (10 points)
Circuit analysis using small signal model (15 points)
Amplifier analysis (20 points)
Amplifier analysis (30 points)