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# Ch1 transistor as small signal amplifier

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### Ch1 transistor as small signal amplifier

1. 1. Chapter 1<br />Transistor As A Small Signal Amplifier<br />SEE 2253ELECTRONIC CIRCUITS<br />
2. 2. Outcome<br /><ul><li>CO1: Describe the basic laws and theorems of basic concept of amplifiers
3. 3. CO2: Apply the basic laws, theorem and methods of analysis for solving various problems in electronic circuit
4. 4. CO3: Analyze the procedure that should be taken in solving electric circuit using theorems and methods of analysis: Perform AC analysis on amplifiers at low, middle and high frequencies
5. 5. CO4: Categorize and analyze negative feedback topologies</li></ul>Norlaili Mat Safri, Ph.D<br />
6. 6. Contents<br /><ul><li>Intro to Amplifier Circuit
7. 7. Basic Amplifier Circuit, Amplifier Parameters (Avoc, Av, Ai, Zi & Zo), Decibel (dB)
8. 8. BJT as an amplifier
9. 9. Mid freq. ac analysis using hybrid- model – CE, CC, CB
10. 10. Frequency response: Analysis at low & high freq.
11. 11. Short circuit current gain, Bode plot, Simulation using MultiSim</li></ul>Norlaili Mat Safri, Ph.D<br />
12. 12. Intro to Amplifier Circuit<br /><ul><li>Amplifier is a system that can amplify weak electrical signal into strong one by increasing the power level of the weak input signal.
13. 13. Amplifier can amplify current, voltage, and/or power.</li></ul>Norlaili Mat Safri, Ph.D<br />
14. 14. Intro to Amplifier Circuit<br />Concept of small-signal amplifiers<br />DC Supply <br />Voltage<br />Amplifier<br />Input signal<br />Output signal<br />Vi<br />Vo<br />Norlaili Mat Safri, Ph.D<br />
15. 15. Intro to Amplifier Circuit<br />Figure 1.1 : Examples of Amplifier Circuitry System<br />Norlaili Mat Safri, Ph.D<br />
16. 16. Basic Amplifier Model<br />Norlaili Mat Safri, Ph.D<br />Figure 1.2 : Amplifier Model<br />
17. 17. Intro to Amplifier Circuit<br /><ul><li> Amplifier has 3 basic quantities (gain, A; input impedance, Zi, & output impedance, Zo).</li></ul>Gain<br /><ul><li>Voltage gain :
18. 18. Current gain :
19. 19. Power gain :</li></ul>Norlaili Mat Safri, Ph.D<br />
20. 20. Amplifier Parameters<br /> (Avoc, Av, Ai, Zi & Zo)<br />Gain (A)<br /><ul><li>Av & Ai: refer to previous slide.
21. 21. AVOC? Zi? Zo?</li></ul>Norlaili Mat Safri, Ph.D<br />
22. 22. Decibel (dB)<br />Gain (A), in dB<br />Av (dB) = 20 log Av<br />If normalized,<br />Av (dB) = 20 log (Av/Avmax)<br />How about current gain (Ai) and power gain (Ap)?<br />Norlaili Mat Safri, Ph.D<br />
23. 23. Basic Amplifier Circuit<br />Voltage amplifier<br />Current amplifier<br />Figure 1.3 : Amplifier Model<br />Norlaili Mat Safri, Ph.D<br />
24. 24. Basic Amplifier Circuit<br />Transconductance<br /> amplifier<br />Transresistance<br /> amplifier<br />Figure 1.3 : Amplifier Model…cont.<br />Norlaili Mat Safri, Ph.D<br />
25. 25. Basic Amplifier Circuit<br />Q. What is an amplifier?<br />Q. What is an ideal amplifier?<br />1<br />2<br />Norlaili Mat Safri, Ph.D<br />
26. 26. Basic Amplifier Model<br />Your Answers to Attributes of an Ideal Amplifier,<br />Norlaili Mat Safri, Ph.D<br />
27. 27. Basic Amplifier Circuit<br />Unloaded voltage gain<br />Keyword: Unloaded?<br />Figure 1.4 : Basic amplifier model (unloaded)<br />Norlaili Mat Safri, Ph.D<br />
28. 28. Basic Amplifier Circuit<br />With loading effects<br />Keyword: Loaded?<br />Figure 1.5 : Basic amplifier model (loaded)<br />Norlaili Mat Safri, Ph.D<br />