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Generally, the gain of transistor falls at high frequencies due to the
- a)internal capacitances of the device
- b)coupling capacitor at the input.
- c)Skin effect
- d)Coupling capacitor at the output
Correct answer is option 'A'. Can you explain this answer?
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Generally, the gain of transistor falls at high frequencies due to the...
At high frequency, internal capacitance comes into consideration.
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Generally, the gain of transistor falls at high frequencies due to the...
Reason for Gain Reduction at High Frequencies in Transistor Amplifiers
Internal Capacitances of the Device
The gain of a transistor amplifier falls at high frequencies due to the internal capacitances of the device. This is because the internal capacitances of the transistor cause the signal to be attenuated as the frequency increases. The internal capacitances can be classified into three types:
1. Input Capacitance - This is the capacitance between the base and the emitter of the transistor. It is responsible for coupling the input signal from the source to the transistor.
2. Output Capacitance - This is the capacitance between the collector and the emitter of the transistor. It is responsible for coupling the output signal from the transistor to the load.
3. Transition Capacitance - This is the capacitance between the base and the collector of the transistor. It is responsible for the change of the charge carriers from the emitter to the collector.
As the frequency increases, the internal capacitances of the transistor start to have a significant effect on the signal. This causes the gain to drop at high frequencies and limits the bandwidth of the amplifier.
Conclusion
In conclusion, the internal capacitances of the transistor are responsible for the gain reduction at high frequencies in transistor amplifiers. The input capacitance, output capacitance, and transition capacitance all contribute to the attenuation of the signal as the frequency increases. This limits the bandwidth of the amplifier and reduces its effectiveness at high frequencies.
Internal Capacitances of the Device
The gain of a transistor amplifier falls at high frequencies due to the internal capacitances of the device. This is because the internal capacitances of the transistor cause the signal to be attenuated as the frequency increases. The internal capacitances can be classified into three types:
1. Input Capacitance - This is the capacitance between the base and the emitter of the transistor. It is responsible for coupling the input signal from the source to the transistor.
2. Output Capacitance - This is the capacitance between the collector and the emitter of the transistor. It is responsible for coupling the output signal from the transistor to the load.
3. Transition Capacitance - This is the capacitance between the base and the collector of the transistor. It is responsible for the change of the charge carriers from the emitter to the collector.
As the frequency increases, the internal capacitances of the transistor start to have a significant effect on the signal. This causes the gain to drop at high frequencies and limits the bandwidth of the amplifier.
Conclusion
In conclusion, the internal capacitances of the transistor are responsible for the gain reduction at high frequencies in transistor amplifiers. The input capacitance, output capacitance, and transition capacitance all contribute to the attenuation of the signal as the frequency increases. This limits the bandwidth of the amplifier and reduces its effectiveness at high frequencies.
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Generally, the gain of transistor falls at high frequencies due to thea)internal capacitances of the deviceb)coupling capacitor at the input.c)Skin effectd)Coupling capacitor at the outputCorrect answer is option 'A'. Can you explain this answer?
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