The cut-off frequency (fβ) is basically the frequency at which the short circuit __________(a) CB gain of transistor drops by 3 dB from its value at low frequency(b) CE gain of transistor drops by 3 dB from its value at low frequency(c) CC gain of transistor drops by 3 dB from its value at low frequency(d) CC gain of transistor drops by 3 dB from its value at high frequencyThis question was addressed to me during an interview.My doubt stems from Frequency Compensation in portion Frequency Response of Electronic Devices & Circuits

The cut-off frequency (fβ) is basically the frequency at which the sh

1.	The cut-off frequency (fβ) is basically the frequency at which the short circuit __________(a) CB gain of transistor drops by 3 dB from its value at low frequency(b) CE gain of transistor drops by 3 dB from its value at low frequency(c) CC gain of transistor drops by 3 dB from its value at low frequency(d) CC gain of transistor drops by 3 dB from its value at high frequencyThis question was addressed to me during an interview.My doubt stems from Frequency Compensation in portion Frequency Response of Electronic Devices & Circuits
Answer» Correct answer is (b) CE gain of transistor drops by 3 DB from its value at low frequency The explanation: Cut-off frequency (fβ) is BASICALLY the frequency at which short circuit CE gain of transistor drops by 3dB from its value at low frequency. Thus, the frequency range upto the cut-off frequency(fβ) is regarded as the bandwidth of circuit. ALSO, the current gain reduces to 70.7% of the low frequency current gain. Likewise, the frequency at which short circuit CB gain of transistor drops by 3dB from its value next to low frequency is known as cut-off frequency (fα). The RELATIONSHIP between these cut-off frequencies indicates that the 3dB frequency of CB configuration is (1 + hfe) times GREATER or higher as compared to that of CE configuration.

Discussion

No Comment Found

Related InterviewSolutions

If the ratio RB / RE tends to infinity, what should be the value of stability factor in voltage divider circuit?(a) Unity(b) Zero(c) 1 – βdc(d) 1 + βdcThe question was asked in an interview for job.This key question is from Frequency Compensation in chapter Frequency Response of Electronic Devices & Circuits
Which of the following process plays a crucial role in devising the independency of operating point over the variations in temperature or transistor parameters?(a) Bias stabilization(b) Bias compensation(c) Bias stabilization & compensation(d) No processThe question was asked in a job interview.I want to ask this question from Frequency Compensation topic in section Frequency Response of Electronic Devices & Circuits
What is the application of a high frequency response of emitter follower amplifier?(a) Positive feedback(b) Voltage gain(c) Power gain(d) Impedance matchingI got this question during an interview.My question comes from High-Frequency Response of the Emitter Followers in section Frequency Response of Electronic Devices & Circuits
Which among the below specified conditions is applicable to prevent the occurrence of thermal runaway in voltage divider bias circuit?(a) VCE < VCC / 2(b) VCE = VCC / 2(c) VCE > VCC / 2(d) None of the mentionedThis question was addressed to me in an internship interview.I need to ask this question from Frequency Compensation in section Frequency Response of Electronic Devices & Circuits
Which among the following will possess a higher bandwidth, if two transistors are provided with unity gain frequency?(a) Transistor with lower hfe(b) Transistor with higher hfe(c) Transistor with lower hre(d) Transistor with higher hreI have been asked this question in a national level competition.My question is taken from Frequency Compensation topic in division Frequency Response of Electronic Devices & Circuits
How many methods of coupling are used for a high frequency response of multistage amplifier?(a) 3(b) 4(c) 2(d) 5This question was addressed to me during an interview.My doubt stems from High Frequency Response of Multistage Amplifiers topic in division Frequency Response of Electronic Devices & Circuits
What does cascading of two transistor amplifiers imply?(a) Output of first stage sent to input of second stage(b) Output of first stage sent to coupling device(c) Input of first stage sent to input of second stage(d) Not relatedThe question was posed to me in an online quiz.My doubt is from High Frequency Response of Multistage Amplifiers topic in chapter Frequency Response of Electronic Devices & Circuits
According to Millers Theorem, what is the impedance in output port if I1 = 20 mA, I2 = 30 mA and Z = 2.3 kΩ?(a) 0.38 kΩ(b) 3.83 kΩ(c) 0.57 kΩ(d) 5.75 kΩThe question was posed to me in semester exam.I'm obligated to ask this question of Frequency Response in division Frequency Response of Electronic Devices & Circuits
How is the output impedance of a high frequency response of emitter follower amplifier?(a) Irrelevant(b) Moderate(c) Low(d) HighThis question was posed to me during an interview.This question is from High-Frequency Response of the Emitter Followers in division Frequency Response of Electronic Devices & Circuits
What technique is used in Millers Theorem?(a) Two – port network(b) Hybrid parameters(c) Grounding(d) Short circuitingThis question was addressed to me in an international level competition.The question is from Frequency Response topic in section Frequency Response of Electronic Devices & Circuits

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment