Question
Download Solution PDFThe gain of an RC-Coupled amplifier decreases at high frequencies due to:
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KVS TGT WET (Work Experience Teacher) Official Paper
Answer (Detailed Solution Below)
Option 1 : Inter-electrode capacitance and shunt capacitance
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KVS TGT Mathematics Mini Mock Test
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Detailed Solution
Download Solution PDFExplanation:
The inter-electrode or internal capacitance of a bipolar transistor is as shown:
- The internal capacitances of the BJT are Cbc, Cbe, Cce
- The capacitor between the base and collector Cbc connects the output with the input
- Because of this, negative feedback takes place in the circuit and the gain decreases
- The capacitance Cbe offers a low input impedance at higher frequency thus reducing the effective input signal and so the gain falls.
- CCe provides a shunting effect at high frequencies on the output side and reduces the gain of the amplifier.
The gain of a bipolar transistor is as shown below:
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