AC ANALYSIS OF BJT 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 gain, medium input impedance, high output impedance, and a 180° phase shift from input to output. The CC circuit has […]

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 base voltage (VB) from the supply. The transistor collector terminal is directly connected to VCC, no collector resistor is used. […]

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)]. RE must also be shown in the h-parameter circuit between the transistor emitter terminal and the circuit common input-output terminal, […]

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 Parameters. Figure 6-9 shows the ac equivalent circuit for a transistor connected in common-base configuration. Resistor re represents the BE […]

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