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In a Common Drain (CD) MOSFET amplifier with voltage divider bias with R1 and R2 equal to 1.5 MΩ and 1 MΩ respectively, the input impedance Zf is:
- a)220 kΩ
- b)600 kΩ
- c)470 kΩ
- d)200 kΩ
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
In a Common Drain (CD) MOSFET amplifier with voltage divider bias with...
Common drain Amplifies with voltage divider bias and its small-signal equivalent circuit is as shown below:
Calculation:
Given:
R1 = 1.5 MΩ, R2 = 1 MΩ
So,
Rin = R1 ⋅ R2 / R1 + R2
Rin = 1.5MΩ × 1MΩ / 2.5MΩ
Rin = 600 kΩ
Most Upvoted Answer
In a Common Drain (CD) MOSFET amplifier with voltage divider bias with...
Calculation of Input Impedance Zf:
- The input impedance Zf of a CD MOSFET amplifier with voltage divider bias can be calculated using the formula:
Zf = R1 || R2 + (1 + g_m * (R1 || R2))^-1
- Given that R1 = 1.5 MΩ and R2 = 1 MΩ, we can substitute these values into the formula.
Calculating R1 || R2:
- R1 || R2 = (R1 * R2) / (R1 + R2)
- R1 || R2 = (1.5 MΩ * 1 MΩ) / (1.5 MΩ + 1 MΩ)
- R1 || R2 = 1.5 MΩ * 1 MΩ / 2.5 MΩ
- R1 || R2 = 0.6 MΩ = 600 kΩ
Calculating g_m:
- Given parameters of the MOSFET and biasing conditions, the transconductance g_m is typically provided in the problem statement.
Substitute into the Input Impedance Formula:
- Zf = 600 kΩ + (1 + g_m * 600 kΩ)^-1
Final Calculation:
- Since we are given the options, we can calculate the input impedance for each option and find that the correct answer is option 'B' 600 kΩ.
Therefore, the input impedance Zf of the Common Drain (CD) MOSFET amplifier with voltage divider bias is 600 kΩ.
- The input impedance Zf of a CD MOSFET amplifier with voltage divider bias can be calculated using the formula:
Zf = R1 || R2 + (1 + g_m * (R1 || R2))^-1
- Given that R1 = 1.5 MΩ and R2 = 1 MΩ, we can substitute these values into the formula.
Calculating R1 || R2:
- R1 || R2 = (R1 * R2) / (R1 + R2)
- R1 || R2 = (1.5 MΩ * 1 MΩ) / (1.5 MΩ + 1 MΩ)
- R1 || R2 = 1.5 MΩ * 1 MΩ / 2.5 MΩ
- R1 || R2 = 0.6 MΩ = 600 kΩ
Calculating g_m:
- Given parameters of the MOSFET and biasing conditions, the transconductance g_m is typically provided in the problem statement.
Substitute into the Input Impedance Formula:
- Zf = 600 kΩ + (1 + g_m * 600 kΩ)^-1
Final Calculation:
- Since we are given the options, we can calculate the input impedance for each option and find that the correct answer is option 'B' 600 kΩ.
Therefore, the input impedance Zf of the Common Drain (CD) MOSFET amplifier with voltage divider bias is 600 kΩ.
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Community Answer
In a Common Drain (CD) MOSFET amplifier with voltage divider bias with...
Common drain Amplifies with voltage divider bias and its small-signal equivalent circuit is as shown below:
Calculation:
Given:
R1 = 1.5 MΩ, R2 = 1 MΩ
So,
Rin = R1 ⋅ R2 / R1 + R2
Rin = 1.5MΩ × 1MΩ / 2.5MΩ
Rin = 600 kΩ
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In a Common Drain (CD) MOSFET amplifier with voltage divider bias with R1and R2equal to 1.5 MΩ and 1 MΩ respectively, the input impedance Zfis:a)220 kΩb)600 kΩc)470 kΩd)200 kΩCorrect answer is option 'B'. Can you explain this answer? for Electrical Engineering (EE) 2025 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about In a Common Drain (CD) MOSFET amplifier with voltage divider bias with R1and R2equal to 1.5 MΩ and 1 MΩ respectively, the input impedance Zfis:a)220 kΩb)600 kΩc)470 kΩd)200 kΩCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a Common Drain (CD) MOSFET amplifier with voltage divider bias with R1and R2equal to 1.5 MΩ and 1 MΩ respectively, the input impedance Zfis:a)220 kΩb)600 kΩc)470 kΩd)200 kΩCorrect answer is option 'B'. Can you explain this answer?.
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