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Full Wave Rectifier

Define the fo...

Question

Define the following terms in a transistor amplifier
1.Input resistance
2.output resistance
3.current amplification factor

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Solution

Input Resistance : When we draw Input Characteristics of an amplifier(Common Emitter Configuration ) the ratio V_BE / I_B at constant V_CEis the Input resistance. Its value is low as compared to Output resistance.
Output Resistance : The ratio V_CE/I_Cat constant I_B. Its value is high as compared to Input resistance.
Current Amplification Factor : It is the ratio of change in collector current to that of Base current. $β$ = I_C/I_Bat constant V_CE.
Where
V_CE= collector emitter voltage
V_BE= base emitter voltage
I_B= base current
I_C= collector current

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= {[\frac{Change in emitter base voltage (△ V_{B E})}{Change in base current (△ I_{B})}]}_{at constant V_{C E}}

R_{i} = {(\frac{△ V_{B E}}{△ I_{B}})}_{V_{C E}}

(β) = {(\frac{△ I_{C}}{△ I_{B}})}_{V_{C E}}

\frac{△ I_{C}}{△ I_{E} - △ I_{C}}

\frac{\frac{△ I_{C}}{△ I_{E}}}{\frac{△ I_{C}}{△ I_{E}} - \frac{△ I_{C}}{△ I_{E}}}

\frac{α}{1 - α}

\Rightarrow β = \frac{α}{1 - α}

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