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The upper cut-off frequency of an RC coupled amplifier mainly depends upon:
- a)Output capacitance of signal source
- b)Inter-electrode and stray shunt capacitances
- c)Coupling capacitor
- d)Emitter bypass capacitor
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
The upper cut-off frequency of an RC coupled amplifier mainly depends ...
The Upper cut off frequency of R-C coupled multistage Amplifier is
Thus upper – cut off frequency depends on coupling capacitors
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The upper cut-off frequency of an RC coupled amplifier mainly depends ...
The upper cut-off frequency of an RC coupled amplifier is the frequency beyond which the gain of the amplifier starts decreasing. It mainly depends upon the coupling capacitor, which is used to couple the output of one stage to the input of the next stage.
Factors affecting the upper cut-off frequency:
1. Coupling capacitor: The coupling capacitor is responsible for passing the AC signal from one stage to the next stage, while blocking the DC component. The value of the coupling capacitor determines the frequency response of the amplifier. A small coupling capacitor will result in a high pass filter, which will attenuate low-frequency signals. A large coupling capacitor will cause a low pass filter, which will attenuate high-frequency signals. Therefore, the upper cut-off frequency of the amplifier depends on the value of the coupling capacitor.
2. Inter-electrode and stray shunt capacitances: Inter-electrode capacitance refers to the capacitance between the input and output electrodes of a transistor. Stray shunt capacitance refers to the capacitance between the input/output circuit and the ground. These capacitances affect the frequency response of the amplifier and can cause unwanted resonances.
Conclusion:
In summary, the upper cut-off frequency of an RC coupled amplifier mainly depends on the value of the coupling capacitor, which determines the frequency response of the amplifier. Inter-electrode and stray shunt capacitances can also affect the frequency response of the amplifier but to a lesser extent.
Factors affecting the upper cut-off frequency:
1. Coupling capacitor: The coupling capacitor is responsible for passing the AC signal from one stage to the next stage, while blocking the DC component. The value of the coupling capacitor determines the frequency response of the amplifier. A small coupling capacitor will result in a high pass filter, which will attenuate low-frequency signals. A large coupling capacitor will cause a low pass filter, which will attenuate high-frequency signals. Therefore, the upper cut-off frequency of the amplifier depends on the value of the coupling capacitor.
2. Inter-electrode and stray shunt capacitances: Inter-electrode capacitance refers to the capacitance between the input and output electrodes of a transistor. Stray shunt capacitance refers to the capacitance between the input/output circuit and the ground. These capacitances affect the frequency response of the amplifier and can cause unwanted resonances.
Conclusion:
In summary, the upper cut-off frequency of an RC coupled amplifier mainly depends on the value of the coupling capacitor, which determines the frequency response of the amplifier. Inter-electrode and stray shunt capacitances can also affect the frequency response of the amplifier but to a lesser extent.
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