The current gain of a bipolar transistor drops at high frequencies because of____________?
Correct answer: A. Transistor capacitances
- A. Transistor capacitances
- B. High current effects in the base
- C. Parasitic inductive elements
- D. The early effect
Explanation
Internal transistor capacitances, especially base-emitter and base-collector capacitances, increasingly shunt the signal as frequency rises and reduce current gain. The Early effect mainly changes collector current with collector voltage, not the primary high-frequency limitation.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
Practise Electronics and Devices
758 free Electronics and Devices MCQs from Electrical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Electrical Engineering questions like this
Electrical Engineering is on 2 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Electronics and Devices questions
Generally, the gain of a transistor amplifier falls at high frequencies due to the___________?
The action of JFET in its equivalent circuit can best be represented as a_____________?
In a full-wave rectifier using two ideal diodes,Vdc & Vm are the dc & peak values of the voltage respectively across a resistive load. If PIV is the peak inverse voltage of the diode, then the appropriate relationships for this rectifier is____________?
Negative feedback in an amplifier____________?
Class AB operation is often used in power large signal amplifiers in order to_________?
An n- channel JFET has IDSS=2mA,and Vp=-4v.Its transconductance gm=in mA/V)for an applied gate to source voltage VGS=-2v is___________?