# Capture.JPG - 5 Frequency Response[20 points Consider the...

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Unformatted text preview: 5. Frequency Response [20 points] Consider the ampliﬁer shown below. Assume gmo = 5 m8, gm12 = 1 m8, gm3,4 = 2 m8, r00 = 50 k0, r012 = 100 k0, and ram = 200 k0. (Note: These are not the correct values for problem 4.. .) Neglect the body effect and assume that all transistors are in saturation. Remember that the inputs are a superposition of the common- mode and differential-mode components, namely Vin+ = VCM + Von/2 and Vin- = VCM — Von/2. a) For the differential-mode half-circuit, calculate the gain (Ad = VOJVin+). b) For the common-mode half-circuit, calculate the gain (Ac = Vo—Nim). c) If a resistor, RL, is added between Vo+ and Vo-, what effect does this have on Ad and Ac? Answer gualitatively in one or two sentences. d) If a capacitor, 033, is added between V9.) and Via", what effect does this have on Ad and Ac? Answer gualitatively in one or two sentences. e) For the common-mode half-circuit only, 055 contributes to fi-i. Calculate the time constant for 059 = 100 pF. ...
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• Fall '08
• Galton,I
• Frequency, Inductor, common-mode half-circuit

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