How does the input impedance of a...

Question 1 / 20MfsMvEsGlv66RQDTqsQi

Question 1 of 20MfsMvEsGlv66RQDTqsQi

How does the input impedance of a field-effect transistor compare with that of a bipolar transistor?

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Question 1 of 20

MfsMvEsGlv66RQDTqsQi

How does the input impedance of a field-effect transistor compare with that of a bipolar transistor?

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🔍 Key Concepts

• Field-effect transistor (FET) gate behaves like what kind of circuit element (think: current in vs. voltage on the gate) • Bipolar junction transistor (BJT) base input – does it draw significant current or very little current? • Relationship between input current and input impedance

💭 Think About

• If a device’s input draws almost no current, what does that suggest about its input impedance? High or low? • In a BJT, the base-emitter junction is similar to what common electronic component, and what kind of impedance does that usually have? • In an FET, is the control terminal (gate) current-controlled or voltage-controlled, and how does that affect input impedance?

✅ Before You Answer

• Be clear on whether an FET is typically considered voltage-controlled or current-controlled. • Recall that the BJT base-emitter junction is a forward-biased PN junction in normal operation – what does that imply about its resistance? • Match the device that draws very small input current with high input impedance, and the one that draws more input current with lower input impedance.

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Question 1 of 20

How does the input impedance of a field-effect transistor compare with that of a bipolar transistor?

An FET has high input impedance; a bipolar transistor has low input impedance.

One cannot compare input impedance without first knowing the supply voltage.

An FET has low input impedance; a bipolar transistor has high input impedance.

The input impedance of FETs and bipolar transistors is the same.

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Question 1 / 20MfsMvEsGlv66RQDTqsQi

Question 1 of 20MfsMvEsGlv66RQDTqsQi

How does the input impedance of a field-effect transistor compare with that of a bipolar transistor?

Back

Question 1 of 20

MfsMvEsGlv66RQDTqsQi

How does the input impedance of a field-effect transistor compare with that of a bipolar transistor?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

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