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In the following C.S. stage shown below, what is the input impedance if λ > 0?
- a)Infinite
- b)0
- c)Very low
- d)ro
Correct answer is option 'A'. Can you explain this answer?
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In the following C.S. stage shown below, what is the input impedance i...
Understanding the C.S. Stage Input Impedance
The Common Source (C.S.) stage is a fundamental configuration in FET amplifiers, particularly in MOSFETs. The input impedance of this stage is crucial for understanding its performance.
What is Input Impedance?
- Input impedance is defined as the ratio of the input voltage to the input current at the terminals of the amplifier.
- It indicates how much the circuit resists the flow of input current.
Conditions for Input Impedance
- In the Common Source stage, when the transconductance parameter (λ) is greater than zero, it implies that the device has a finite output conductance.
- This leads to a specific behavior in terms of input impedance.
Input Impedance Characteristics
- For a C.S. stage with λ > 0, the input impedance is primarily determined by the gate-source capacitance and the gate resistance.
- The MOSFET does not draw any DC current at the gate, leading to very high input impedances.
Why is the Answer Infinite?
- Theoretically, since the input current is negligible (ideally zero), the input impedance approaches infinity.
- This is a desirable property as it ensures minimal loading effect on the previous stage in the circuit.
Conclusion
- Thus, in a C.S. stage where λ > 0, the input impedance is considered infinite, making option 'A' the correct answer.
- This high input impedance allows for effective signal amplification without significant signal loss.
The Common Source (C.S.) stage is a fundamental configuration in FET amplifiers, particularly in MOSFETs. The input impedance of this stage is crucial for understanding its performance.
What is Input Impedance?
- Input impedance is defined as the ratio of the input voltage to the input current at the terminals of the amplifier.
- It indicates how much the circuit resists the flow of input current.
Conditions for Input Impedance
- In the Common Source stage, when the transconductance parameter (λ) is greater than zero, it implies that the device has a finite output conductance.
- This leads to a specific behavior in terms of input impedance.
Input Impedance Characteristics
- For a C.S. stage with λ > 0, the input impedance is primarily determined by the gate-source capacitance and the gate resistance.
- The MOSFET does not draw any DC current at the gate, leading to very high input impedances.
Why is the Answer Infinite?
- Theoretically, since the input current is negligible (ideally zero), the input impedance approaches infinity.
- This is a desirable property as it ensures minimal loading effect on the previous stage in the circuit.
Conclusion
- Thus, in a C.S. stage where λ > 0, the input impedance is considered infinite, making option 'A' the correct answer.
- This high input impedance allows for effective signal amplification without significant signal loss.
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Community Answer
In the following C.S. stage shown below, what is the input impedance i...
The input impedance of the C.S. stage, i.e. the impedance looking into the gate of M1 is always infinite. Hence, in presence of early effect, the input impedance remains infinite.
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In the following C.S. stage shown below, what is the input impedance if λ > 0?a)Infiniteb)0c)Very lowd)roCorrect answer is option 'A'. Can you explain this answer?
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