The beta cutoff frequency of a bipolar...

Question 1 / 27070dpm620n7jMSVsklWxzfH

Question 1 of 27070dpm620n7jMSVsklWxzfH

The beta cutoff frequency of a bipolar transistor is the frequency at which:

Question 1 of 27070

The beta cutoff frequency of a bipolar transistor is the frequency at which:

🔍 Key Concepts

• Meaning of beta (β) in a bipolar junction transistor (BJT) • Definition of cutoff frequency or -3 dB point and the 0.707 factor • Which transistor terminal currents are related to β in a BJT (base, collector, emitter)

💭 Think About

• First, recall what β represents in a BJT: it is the ratio of which current to which current? • At the beta cutoff frequency, what happens to that current gain compared to its low-frequency (maximum) value? Think about the standard -3 dB point. • Look at each option and ask: does this option correctly pair the right current with β and the 0.707 factor?

✅ Before You Answer

• Verify which terminal current gain is actually called β in a BJT (base, collector, or emitter). • Remember that the cutoff frequency is commonly defined where gain falls to 0.707 of its maximum (the -3 dB point). • Eliminate any choices that mention a terminal type that does not exist in a BJT or that misuse the term β.

Question 1 of 27070

The beta cutoff frequency of a bipolar transistor is the frequency at which:

Base current gain has increased to 0.707 of maximum.

Emitter current gain has decreased to 0.707 of maximum.

Collector current gain has decreased to 0.707.

Gate current gain has decreased to 0.707.

Question 1 / 27070dpm620n7jMSVsklWxzfH

Question 1 of 27070dpm620n7jMSVsklWxzfH

The beta cutoff frequency of a bipolar transistor is the frequency at which:

Back

Question 1 of 27070

The beta cutoff frequency of a bipolar transistor is the frequency at which: