Question
Download Solution PDFWhat is the threshold frequency, If a transistor has a short circuit current gain of 50 and the capacitance measured in the hybrid-π model of the transistor is 120 pF?
This question was previously asked in
UPRVUNL JE Control & Instrumentation 2021 Official Paper
Answer (Detailed Solution Below)
Option 4 : 66.3 GHz
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ST 1: UPRVUNL JE - Basic Concepts and Circuit law
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Detailed Solution
Download Solution PDFConcept:
- The unity-gain bandwidth (fT) of an amplifier is simply the frequency of an input signal at which the open-loop gain is equal to unity.
- This is the threshold frequency above which the amplifier will act as an attenuator.
- It is calculated by using the formula :
Here β = short circuit current gain
Cin= (Cπ + Cμ ) = Capacitance measured in the hybrid- π model.
Calculation:
Given; β = 50, Cin = 120 pF
Option 4 is the correct answer.
Last updated on Jun 13, 2024
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