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An CE transistor amplifier has a collector current of 1.0mA when its base current is 25μA at room temp. What is the value of its input resistance (in ohms)?
Correct answer is '1000'. Can you explain this answer?
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To fully answer this question, we need to know the value of the transistor's current gain, also known as the beta (β) value. The β value determines the ratio of collector current (IC) to base current (IB) in a common-emitter (CE) transistor configuration.
Let's assume the β value of the transistor is 50. This means that for every 1 unit of base current, we get 50 units of collector current. Therefore, if the base current (IB) is 25 μA (microamps), the collector current (IC) would be:
IC = β * IB
IC = 50 * (25 μA)
IC = 1250 μA or 1.25 mA
So, with a base current of 25 μA, the collector current of the CE transistor amplifier would be 1.25 mA.
Let's assume the β value of the transistor is 50. This means that for every 1 unit of base current, we get 50 units of collector current. Therefore, if the base current (IB) is 25 μA (microamps), the collector current (IC) would be:
IC = β * IB
IC = 50 * (25 μA)
IC = 1250 μA or 1.25 mA
So, with a base current of 25 μA, the collector current of the CE transistor amplifier would be 1.25 mA.
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An CE transistor amplifier has a collector current of 1.0mA when its base current is 25μA at room temp. What is the value of its input resistance (in ohms)?Correct answer is '1000'. Can you explain this answer?
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