課程名稱︰電子學一
課程性質︰必修
課程教師︰呂良鴻
開課學院：電資學院
開課系所︰電機系
考試日期（年月日）︰2008/10/17
考試時限（分鐘）：50分
是否需發放獎勵金：是
（如未明確表示，則不予發放）
試題 :
Microelectrnic Circuits I (Quiz 1)
1.(50%)In designing with op amps one has to check the limitations on the
voltage and frequency ranges of operation of the closed-loop amplifier,
imposed by the op amp finite bandwidth (f1), slew rate(SR), and output
saturation(Vomax). This problem illustrates the points by considering the
use of an op amp with ft=2MHz, SR=1V/us, and Vomax=10V in the design of a
noninverting amplifier with a nominal gain of 10. Assume a sine-wave input
with peak amplitude Vi.
(a) If Vi=0.5V, what is the maximum frequency before the output distorts?
(b) If f=20kHz, what is the maximum value of Vi before the output distorts?
(c) If Vi=50mV, what is the useful frequency range of operation?
(d) If f=5kHz, what is the useful input voltage range?
2.(50%)An op-amp-based inverting integrator is measured at 1kHz to have a
voltage gain of -100V/V. At what frequency is its gain reduced to -1V/V?
What is the integrator time constant?
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