# GEORGIA INSTITUTE OF TECHNOLOGY SCHOOL of ELECTRICAL & COMPUTER ENGINEERING FINAL EXAM. COURSE: ECE 3084A (Prof. Michaels)

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2 Problem F.1: Short problem assortment. The six parts of this problem are unrelated to each other. (a) (5 pts) Consider the system with input x(t) and output y(t) described by the following equation: y(t) = 1. Circle yes or no in each row of the table below to indicate whether or not x(t) this system is linear, time-invariant, and/or causal. Linear yes no Time-Invariant yes no Causal yes no (b) (5 pts) The functions x(t) and y(t) are shown below where y(t) = x(bt + C). Find B and C and write them below the figure. x(t) y(t) t t B = C = (c) (5 pts) Simplify the following expression: t 0 cos(πτ)[δ(τ + 2) + δ(τ 1)]dτ = 2

3 (d) (10 pts) Consider the Fourier series of the periodic signal x(t) shown below with a period of T 0 = 4s. In the table below, circle exactly one attribute for each of the k = 0, k = 1, and k = 2 Fourier coefficients; that is, indicate if a k is either zero, non-zero real, imaginary or complex (non-zero real and imaginary parts). You should not need to evaluate any integrals.... x(t) t 1 k = 0 zero non-zero real imaginary complex k = 1 zero non-zero real imaginary complex k = 2 zero non-zero real imaginary complex (e) (5 pts) Find X(jω), the Fourier transform of the signal x(t) = e at δ(t nt ) n=0 (f) (10 pts) Find x(t), the inverse Fourier transform of X(jω) = u(ω + 2) u(ω + 1) + u(ω 1) u(ω 2). You may find it helpful to sketch X(jω) first. 3

4 Problem F.2: For each part of this problem, consider the convolution y(t) = x(t) h(t). For each part, x(t) and h(t) are different, and four choices for y(t) are shown. Indicate your choice of y(t) by putting an X inside the box adjacent to your selected plot. For each chosen y(t), label its horizontal axis at all tic marks shown, and also label the vertical axis to show the maximum value. (a) (5 points) x a (t) (1) (0.5) 1 h a (t) (b) (5 points) x b (t) 1 1 h b (t)

5 (c) (5 points) x c (t) h c (t) (d) (5 points) x d (t) 1 1 h d (t)

6 Problem F.3: Consider the circuit shown below with input current source i(t): i 1 (t) L i 2 (t) i(t) R C + v c (t) (a) (10 pts) Draw this circuit in the s-domain assuming zero initial conditions. Properly label all quantities indicated on the original circuit for full credit. (b) (10 pts) Determine the transfer function relating the input current source to the voltage across the capacitor, H(s) = V c (s)/i(s), by analyzing it in the s-domain. Simplify H(s) so that it is expressed as a ratio of polynomials in s. (c) (5 pts) Let i(t) = I 0 u(t). voltage. Use the Final Value Theorem to find the steady state output 6

7 Problem F.4: Consider a system with input x(t) and output y(t) whose impulse response is h(t) = δ(t)+δ(t t d ). This system is a reasonable model for a signal with an echo (often called multipath ) where t d, the time delay of the echo, is unknown. (a) (10 pts) Find H(jω) in terms of t d. Simplify it as much as possible, which will help you with part (c). (b) (10 pts) Find y(t) for t d = 4 and x(t) = 5 + u(t) u(t 1) + 2 cos( π 2 t). 7

8 (c) (10 pts) Accurately sketch H(jω) for ω < 6π/t d. (d) (5 pts) One strategy for finding t d is to excite the system with a delta function; i.e., x(t) = δ(t), and analyze the response y(t) in the frequency domain by finding its nulls (frequencies where Y (jω) = 0). Express t d in terms of ω null, the first null of Y (jω), for x(t) = δ(t). (This should be very straightforward if part (c) is correct). 8

9 Problem F.5: (5 pts each) The table below gives transfer functions of six second order LTI systems. For each system, find the pole locations and decide whether the system is stable or unstable. If the system is stable, circle the attributes regarding filter type, damping and resonance that apply to that system. The attribute Resonant means that there is a peak in the frequency response for a low-pass or high-pass filter. If the system is unstable, give an example of one bounded input x(t) starting at t = 0 that results in an unbounded output y(t). (a) H(s) = 2 s 2 + 6s + 5, Poles: Circle One: Stable Unstable If stable, circle the appropriate attributes associated with H(s): Low-pass Filter Band-pass Filter High-pass Filter Underdamped Critically Damped Overdamped Resonant If unstable, specify a bounded input starting at t = 0 that results in an unbounded output x(t) = (b) H(s) = 2s 2 s 2 + 2s + 10, Poles: Circle One: Stable Unstable If stable, circle the appropriate attributes associated with H(s): Low-pass Filter Band-pass Filter High-pass Filter Underdamped Critically Damped Overdamped Resonant If unstable, specify a bounded input starting at t = 0 that results in an unbounded output x(t) = (c) H(s) = 36 s , Poles: Circle One: Stable Unstable If stable, circle the appropriate attributes associated with H(s): Low-pass Filter Band-pass Filter High-pass Filter Underdamped Critically Damped Overdamped Resonant If unstable, specify a bounded input starting at t = 0 that results in an unbounded output x(t) = 9

10 (d) H(s) = 20s s s + 25, Poles: Circle One: Stable Unstable If stable, circle the appropriate attributes associated with H(s): Low-pass Filter Band-pass Filter High-pass Filter Underdamped Critically Damped Overdamped Resonant If unstable, specify a bounded input starting at t = 0 that results in an unbounded output x(t) = (e) H(s) = s 2 s 2 + 4s 5, Poles: Circle One: Stable Unstable If stable, circle the appropriate attributes associated with H(s): Low-pass Filter Band-pass Filter High-pass Filter Underdamped Critically Damped Overdamped Resonant If unstable, specify a bounded input starting at t = 0 that results in an unbounded output x(t) = (f) H(s) = 100 s 2 + 8s + 25, Poles: Circle One: Stable Unstable If stable, circle the appropriate attributes associated with H(s): Low-pass Filter Band-pass Filter High-pass Filter Underdamped Critically Damped Overdamped Resonant If unstable, specify a bounded input starting at t = 0 that results in an unbounded output x(t) = 10

11 Problem F.6: This problem considers velocity control of a plant G p (s) using a controller G c (s) where G c (s) = K p 1 (proportional control) and G p (s) = s(s + a). R(s) + G c (s) G p (s) Y(s) (a) (5 pts) Find the transfer function H(s) of the closed loop system in terms of a, the plant pole location, and K p. Express your answer as a ratio of polynomials with all like terms combined. (b) (10 pts) For K p > 0 and a > 0, indicate whether the following statements about the closed loop system are true or false. Select Can t Tell if there is insufficient information to determine if it is true or false. The system is stable for all K p > 0 and a > 0 True False Can t Tell The system perfectly tracks a step function input True False Can t Tell The system is overdamped True False Can t Tell The natural frequency ω n depends only on K p True False Can t Tell The damping ratio ζ depends only on a True False Can t Tell (c) (10 pts) Consider the case where a = 10. Find K p such that ζ = 5/6. Where are the poles of the resulting closed loop system? 11

12 Problem F.7: Consider the feedback system shown below, which differs from that of the previous problem by having positive feedback (see the positive sign where y(t) feeds into the summing junction). The transfer function of a closed loop system with positive feedback is H + (s) = G c(s)g p (s) 1 G c (s)g p (s). Positive feedback is usually undesirable, but it is often quite easy to accidentally hook up a system incorrectly such that the feedback is positive rather than negative (Prof. Michaels knows this from personal experience). As for the previous problem, consider the situation for which the plant output, y(t), is the velocity of a mechanical system, and the goal is to control velocity. R(s) + G c (s) G p (s) Y(s) + (a) (5 pts) Find the transfer function H + (s) of the closed loop system with positive feedback for 1 G c (s) = K p (proportional control) and G p (s) =. Express your answer as a ratio of s(s + a) polynomials with all like terms combined. (b) (10 pts) For a = 9 and K p = 10, find the complete step response; that is, find y(t) for r(t) = u(t). 12

13 (c) (10 pts) Keeping in mind that y(t) is the velocity of a mechanical system, consider the case whereby the systems engineer immediately observes the undesirable step response from part (b) and turns off the input as soon as possible; i.e., r(t) = u(t) u(t t d ). What is y(t) for t >> t d? Does it return to zero (i.e., eventually stops moving), does it stabilize to a specific value (i.e., runs at a constant velocity), or does it keep increasing (until something limits the velocity)? 13

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### GEORGIA INSTITUTE OF TECHNOLOGY SCHOOL of ELECTRICAL & COMPUTER ENGINEERING FINAL EXAM. COURSE: ECE 3084A (Prof. Michaels)

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