InterviewSolution
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InterviewSolution
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Given that β=200, input frequency is f = 20Mhz and short circuit current gain is A = 100. What is the unity gain frequency?(a) 2308 Mhz(b) 2000 Mhz(c) 2508 Mhz(d) 3000 MhzI have been asked this question by my college professor while I was bunking the class.My doubt stems from High Frequency Response in division Transistor Frequency Response of Analog Circuits |
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Answer» RIGHT choice is (a) 2308 Mhz To explain: A = \(\FRAC{β}{\sqrt{1+(20Mhz/fβ)^2}}\) 1 + (20/f)^2 = 4 20/f = 1.732 fβ = 11.54 Mhz Unity GAIN frequency = βfβ = 200 X 11.54Mhz = 2308 Mhz. |
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