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AC Analysis of BJT Circuits / Electronic Devices and Circuits

Difference Between Common Base Common Emitter and Common Collector

Difference Between Common Base Common Emitter and Common Collector: Table 6-2 compares Zi, Zo, and Av, for difference Between Common Base Common Emitter and Common Collector circuits. As already discussed, the CE circuit has high voltage…

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February 12, 2019
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AC Analysis of BJT Circuits / Electronic Devices and Circuits

Common Base Circuit Diagram

Common Base Circuit Diagram: The Common Base Circuit Diagram (CB) shown in Fig. 6-34 is very similar to a CE circuit, except that the input signal is applied to the transistor emitter terminal (via C2),…

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February 12, 2019
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AC Analysis of BJT Circuits / Electronic Devices and Circuits

Common Collector Circuit Analysis

Common Collector Circuit Analysis: In the Common Collector Circuit Analysis (CC) shown in Fig. 6-28 the external load (RL) is capacitor-coupled to the transistor emitter terminal. The circuit uses voltage divider bias to derive the transistor…

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February 12, 2019
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AC Analysis of BJT Circuits / Electronic Devices and Circuits

CE Circuit with Unbypassed Emitter Resistor

CE Circuit with Unbypassed Emitter Resistor: h-parameter Equivalent Circuit - When an CE Circuit with Unbypassed Emitter Resistor (RE) as shown in Fig. 6-25(a), it is also present in the ac equivalent circuit, [Fig. 6-25(b)].…

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February 12, 2019
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AC Analysis of BJT Circuits / Electronic Devices and Circuits

Common Emitter Amplifier Circuit

Common Emitter Amplifier Circuit: Consider the Common Emitter Amplifier Circuit circuit shown in Fig. 6-17. When the capacitors are regarded as ac short-circuits, it is seen that the circuit input terminals are the transistor base…

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February 12, 2019
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AC Analysis of BJT Circuits / Electronic Devices and Circuits

Transistor Models and Parameters

Transistor Models and Parameters: T-Equivalent Circuit - Because a transistor consists of two pn-junctions with a common centre block, it should be possible to use two pn-junction ac equivalent circuits as the Transistor Models and…

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February 12, 2019
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AC Analysis of BJT Circuits / Electronic Devices and Circuits

AC Load Line of BJT

AC Load Line of BJT: AC Equivalent Circuits - Capacitors behave as short-circuits to ac signals, so in the ac equivalent circuit for a transistor circuit all capacitors must be replaced with short-circuits. Power supplies…

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February 12, 2019
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AC Analysis of BJT Circuits / Electronic Devices and Circuits

Coupling and Bypassing Capacitors Coupling

Coupling and Bypassing Capacitors: Coupling Capacitors - To use a transistor circuit to amplify or otherwise process an ac signal, the signal source must be connected to the circuit input. If the source is directly…

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February 10, 2019
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