29. Common Emitter Amplifier (contd.) - Numerical examples (Part B)
The chapter delves into the analysis of Common Emitter (CE) amplifiers, focusing on performance parameters such as voltage gain, input and output resistance, cutoff frequencies, and output swing. It discusses the effects of fixed bias and cell bias configurations on these parameters and presents numerical examples to illustrate the concepts. Key points include the importance of bias point stability, power dissipation, and the influence of frequency on amplifier performance.
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What we have learnt
- Common Emitter amplifiers can have variable performance based on biasing methods.
- Voltage gain, input resistance, and output resistance are critical parameters that affect amplifier behavior.
- Understanding cutoff frequencies is essential for determining the bandwidth and overall effectiveness of the amplifier.
Key Concepts
- -- Voltage Gain
- The ratio of output voltage to input voltage, indicative of how much the amplifier increases the signal strength.
- -- Input Resistance
- The resistance seen by the source connected to the amplifier input, affecting how much signal is loaded down.
- -- Output Resistance
- The resistance seen from the output terminals of the amplifier, influencing the ability to drive loads.
- -- Cutoff Frequency
- The frequency at which the gain of the amplifier falls to a specified level, marking the boundary of effective amplification.
- -- Power Dissipation
- The power wasted as heat in an amplifier, which is the product of voltage and current in the circuit.
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