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An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances are
- a)40 kΩ and 8 kΩ respectively
- b)4 kΩ and 80 kΩ respectively
- c)0.4 kΩ and 800 kΩ respectively
- d)8 kΩ and 160 kΩ respectively
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ...
Closed loop input impedance = 4 (1 + 0.1 x 90) = 40 kΩ,
Closed loop Output impedance = 
= 8 kΩ.
= 8 kΩ.Most Upvoted Answer
An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ...
Input Impedance Calculation:
The closed-loop input impedance is given by the formula Zin = (1 + βA) * Zi, where Zin is the closed-loop input impedance, β is the feedback factor (10% or 0.1 in this case), A is the open-loop gain (90), and Zi is the input impedance of the amplifier (4 kΩ).
Plugging in the values, we get Zin = (1 + 0.1 * 90) * 4 kΩ = 40 kΩ.
Output Impedance Calculation:
The closed-loop output impedance is given by the formula Zout = Zo / (1 + βA), where Zout is the closed-loop output impedance, Zo is the output impedance of the amplifier (80 kΩ), and all other variables have the same values as before.
Plugging in the values, we get Zout = 80 kΩ / (1 + 0.1 * 90) = 8 kΩ.
Therefore, the closed-loop input impedance is 40 kΩ and the closed-loop output impedance is 8 kΩ, which corresponds to option 'A'.
The closed-loop input impedance is given by the formula Zin = (1 + βA) * Zi, where Zin is the closed-loop input impedance, β is the feedback factor (10% or 0.1 in this case), A is the open-loop gain (90), and Zi is the input impedance of the amplifier (4 kΩ).
Plugging in the values, we get Zin = (1 + 0.1 * 90) * 4 kΩ = 40 kΩ.
Output Impedance Calculation:
The closed-loop output impedance is given by the formula Zout = Zo / (1 + βA), where Zout is the closed-loop output impedance, Zo is the output impedance of the amplifier (80 kΩ), and all other variables have the same values as before.
Plugging in the values, we get Zout = 80 kΩ / (1 + 0.1 * 90) = 8 kΩ.
Therefore, the closed-loop input impedance is 40 kΩ and the closed-loop output impedance is 8 kΩ, which corresponds to option 'A'.
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An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances area)40 kΩ and 8 kΩ respectivelyb)4 kΩ and 80 kΩ respectivelyc)0.4 kΩ and 800 kΩ respectivelyd)8 kΩ and 160 kΩ respectivelyCorrect answer is option 'A'. Can you explain this answer?
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An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances area)40 kΩ and 8 kΩ respectivelyb)4 kΩ and 80 kΩ respectivelyc)0.4 kΩ and 800 kΩ respectivelyd)8 kΩ and 160 kΩ respectivelyCorrect answer is option 'A'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances area)40 kΩ and 8 kΩ respectivelyb)4 kΩ and 80 kΩ respectivelyc)0.4 kΩ and 800 kΩ respectivelyd)8 kΩ and 160 kΩ respectivelyCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances area)40 kΩ and 8 kΩ respectivelyb)4 kΩ and 80 kΩ respectivelyc)0.4 kΩ and 800 kΩ respectivelyd)8 kΩ and 160 kΩ respectivelyCorrect answer is option 'A'. Can you explain this answer?.
An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances area)40 kΩ and 8 kΩ respectivelyb)4 kΩ and 80 kΩ respectivelyc)0.4 kΩ and 800 kΩ respectivelyd)8 kΩ and 160 kΩ respectivelyCorrect answer is option 'A'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances area)40 kΩ and 8 kΩ respectivelyb)4 kΩ and 80 kΩ respectivelyc)0.4 kΩ and 800 kΩ respectivelyd)8 kΩ and 160 kΩ respectivelyCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances area)40 kΩ and 8 kΩ respectivelyb)4 kΩ and 80 kΩ respectivelyc)0.4 kΩ and 800 kΩ respectivelyd)8 kΩ and 160 kΩ respectivelyCorrect answer is option 'A'. Can you explain this answer?.
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