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ECEN325Midterm1

# ECEN325Midterm1 - ECEN 325 Electronics Midterm ~ Oct 2 2007...

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Unformatted text preview: ECEN 325: Electronics Midterm ~ Oct. 2 - 2007 Instructor: Sebastian Hoyos 1. (30%) Draw a low-pass RC circuit and derive its transfer function in dB scale. Also plot the magnitude and phase (Bode Plots). Clearly indicate the DC gain, the 3 dB cut-off frequency, the slope of the curve, etc. V CAMS vuo’EQ/S” 1 9w 2. (30%) Draw a lossy integrator and derive its transfer function in dB scale. Also plot the magnitude and phase (Bode Plots). Clearly indicate the DC gain, the 3 dB cut-off frequency, the slope of the curve, etc. P\Z0\C€ V class vcotc, , 9w % 3. (40%) Consider the circuit below with and ideal Op—Amp. (a) (10%) Assume that the input is a DC voltage. How can you model the capacitors in this case? What is the gain Vo/Vi .7 (b) (10%) Assume that the input is a sinewave at a very high frequency such that the impedances of the capacitors are much smaller than the resistances R1 and R2. How can you modeled the parallel combination of the capacitors and resistors? What is the gain Vo/ Vi .7 (c)(10%)Find the transfer function Vo(jw)/Vi(jw). Deﬁne a); = 1/(R1C1) and a); = l/(R2C2). Plot the phase and magnitude of the transfer function in dB scale (Bode Plots) for the following 2 cases: (d)(5%) 601 << 602 (c)(5%) 602 << (01 Clearly indicate the DC gain, the 3 dB cut-off frequency, the slopes of the curve, the high- frequency gain, etc. Hint: Compare these plots with your answers in 3(a) and 3(b) ...
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ECEN325Midterm1 - ECEN 325 Electronics Midterm ~ Oct 2 2007...

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