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：電機資訊學院 開課系所︰電機系 考試日期（年月日）︰103/10/31 考試時限（分鐘）：50分鐘 是否需發放獎勵金：是 （如未明確表示，則不予發放） 試題 : 1031 Microeletronic Circuits I (Quiz 1) date: 2014/10/31 (Fri) time: 14:20~15:10 1. (50%)For an instrumentation amplifier of the type shown below, a designer proposes to make R2 = R3 = R4 = 100kΩ, and 2R1 = 10kΩ. For ideal components, what differential-mode gain, common-mode gain, and CMRR result? Reevaluate the worst-case values for these for the situation in which all resistors are specified as ±1% units. Repeat the latter analysis for the case in which 2R1 is reduced to 1kΩ. What do you conclude about the importance of the relative difference gains of the first and second stages? 2. A designer, wanting to achieve a stable gain of 100V/V at 5 MHz, considers her choice of amplifier topologies. What unity-gain frequency would a single operational amplifier require to satisfy her need? Unfortunately, the best available amplifier has an f_t of 40 MHz. How many such amplifiers connected in a cascade of identical noninverting stages would she need to achieve her goal? What is the 3-dB frequency of each stage she can use? What is the overall 3-dB frequency? --

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