Homework Assignment 11


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1 Homework Assignment Question State and then explain in 2 3 sentences, the advantage of switched capacitor filters compared to continuoustime active filters. (3 points) Continuous time filters use resistors and capacitors in conjunction with amplifiers. Switchedcapacitor (SC) filters use small capacitors that are rapidly switched between nodes, to simulate large resistances. These SC resistors are then combined with small capacitors and amplifier to form active filters. The switch frequency determines the value of the resistors and passband and cutoff frequencies. Thus, it is very easy to make SC filter electricallytunable. Because largevalue resistors are simulated with small capacitors, the IC real estate requires for SC filter are is small; this is advantageous in ICs. For an engineer the advantage of SC filters include: wide selection of ICs, ease of use, and low cost. Question 2 (Filters) Determine maximum allowable passband variation (in db) for an antialiasing filter that precedes a 6bit A/D converter, assuming one want to use the full resolution of the A/D converter. (6 points) Assume system where V max = V. Every bit in a 6bit system represents /2 6 V. The filter variation should be less than this, otherwise one will not utilize the full resolution of the A/D/. Thus, the filter variation should be less than 20 log( 2 6 ) = db
2 Question 3 Determine the transfer function H(s) for the filter below. Then determine the magnitude of the frequency response, namely H(jω). (8 points) Denote the resistors with R and the capacitors with C. Further, let R ( sc) Z f = R = R + ( sc) + src The transfer function the first stage is H (s) = Z f R = R R + src = + src The stages are identical so the overall transfer function is H(s) = (H ) 3 = ( + src) 3 One way to determine H(jω) is to set s jω in the expression and then determine from the resulting 3 rd order function. A much simpler approach is to determine H (jω) 3 as follows Then H (jω) = + jωrc = + (ωrc) 2 H(jω) = H (jω) 3 = ( + (ωrc) 2 ) 3 2 2
3 Question 4 A second order filter has poles at s = 2 ± j 3 2. The transmission is zero at jω = ±2 rad/s and is unity at dc (ω = 0). Determine the transfer function. (0 points) The poles give the denominator: H(s) = K N(s) D(s) D(s) = (s p )(s + p 2 ) = s + 2 j 3 2 s j 3 2 = s 2 + s + The zeros give the numerator: Thus N(s) = (s z )(s z 2 ) = (s + j2)(s j2) = s At s = 0, H(s) =, so that K = 4. Thus H(s) = K s2 + 4 s 2 + s + H(s) = s s 2 + s + 3
4 Question 5 (Filters) Sketch the transmission specifications for a lowpass filter having a passband defined by f khz and a stopband defined by f 2 khz. A max = 0.5 db, A min = 50 db. The maximum transmission is 0 db. Be sure to label every axis, indicate A max, A min, ω c, ω s, hatch the area that meets the specifications, and so on. (5 points) Any filter with transfer function that falls within the hatched are in the figure below, meets the specifications. ω c = 2π(000) rad s ω s = 2π(2000) rad s A max = 0.5 db, A min = 50 db Question 6 Find the order n for a lowpass Butterworth filter with f c = khz and f s = 2 khz. The maximum passband ripple is db and the stopband gain is 40 db. Remember, the Butterworth response is H(jω) = + ε 2 (ω ω c ) 2n A(jω) = 20 log 0 H(jω) = 20 log 0 + ε 2 (ω ω c ) 2n The maximum ripple (A max ) of db occurs at ω = ω c, so that A max = db = 20 log 0 + ε 2 ε = Further, at the stopband frequency ω s the attenuation is A min, so that A min = 40 db = 20log 0 + ε 2 (2 ) 2n Solving for n yields n = 7.6. Thus use n = 8 for the order of the filter. (5 points) 4
5 Question 7 Consider the prototype lowpass active filter below. It has a cutoff frequency of rad/s. Scale the values such that the Ω resistors are 0K, and the cutoff frequency is khz. Draw the scaled filter. (8 points) To keep the gain the same, the Ω and 0.68Ω resistors are changes to 0K and 6.8K respectively. Changing the cutoff frequency from rad/s to khz means the timeconstants are 2π 0 3 = times shorter. The Ω resistors will become 0K, so that that F capacitors will become ( )(0 0 3 ) = µf. The resulting circuit is below. 5
6 Question 8 (Sensitivity) A sensitivity analysis of the filter below shows that S Q R = 0.5. An engineer designs a filter using this topology such that Q = 00. He calculates R = 5.7K, and then uses the closest % value of 5.8K. Ignoring the other components, what is the resulting filter Q? (6 points) Thus, Thus S Q R = R Q δq Q = 0.5 Q R δr R δq Q = 0.5 δr = 0.5 = R 5.7 δq = ( )Q = ( )(00) = 0.39 Thus the actual Q is =
7 Question 9 (Filters) An engineer designs an 8 th order active filter and uses a cascade implementation. The following table summarizes requirements for the four 2 nd order stages. Write down the cascade order. That is, should the order be A, B, C, D, or C, D, B, A, etc.? Explain briefly. (3 points) 2 nd Order Section Normalized f o Q A B C D Everything else being equal, one should order the filters so that their bandwidth becomes progressively narrower. That is, the sections should be cascaded in order of ascending Q. This avoids loss of dynamic range and filter accuracy due to possible signal clipping. Thus, use this cascade: C, D, B, A However, if there are sections with high Qs, which could amplify internal noise, one could have a different ordering. Section A has a high Q, but probably not high enough to warrant a different order. Question 0 Find the order n for a lowpass Butterworth filter with f c = khz and f s = 2 khz. The maximum passband ripple is db and the stopband gain is 40 db. Remember, the Butterworth response is H(jω) = + ε 2 (ω ω c ) 2n A(jω) = 20 log 0 H(jω) = 20 log 0 + ε 2 (ω ω c ) 2n The maximum ripple (A max ) of db occurs at ω = ω c, so that A max = db = 20 log 0 + ε 2 ε = Further, at the stopband frequency ω s the attenuation is A min, so that A min = 40 db = 20log 0 + ε 2 (2 ) 2n Solving for n yields n = 7.6. Thus use n = 8 for the order of the filter. 7 (8 points)
8 Question (SwitchedCapacitors) For the switchedcapacitor circuit below, the parameters are C = 30 pf, C 2 = 5 pf, C F = 2 pf. The clock frequency is 00 khz. Determine the lowfrequency gain and the cutoff frequency. (6 points) The switched capacitors C and C 2 function as resistors with values R = f C C = kω, and R 2 = f C C 2 = 2 MΩ respectively. At low frequencies C F is an open circuit and the lowfrequency gain is A V = R 2 R = C C 2 = 6 The cutoff frequency is determined by C F and the switched capacitor R 2 f 3dB = = 2πR 2 C F 2π(2 0 6 = 6.63 khz )
9 Question 2 (Filters) After designing a narrowband bandpass filter, an engineer measured the frequency response around the resonance frequency by driving the filter with a 60 mv sinusoidal signal and measuring the output voltage. The following table summarizes the results. F (khz) Vo (V) Use this information and determine the f L, f H, f 0, Q, and H 0BP (0 points) Normalize the output voltage to V. The 3dB frequencies f L and f H are where the output voltage drops to V. From the table, f L is between.9 and.95 khz. Estimate f L.925 khz. Further, f H is between 2.3 and 2.35 khz. Estimate f H khz. F (khz) Vo (V) The resonance frequency f 0 is the geometric mean of f L and f H f 0 = f L f H = = 2.2 khz The bandwidth of the filter is f H f L = = 0.4 khz The filter Q is Q = f 0 BW = = 5.3 Referring to the original table, at the resonance frequency the output voltage is 0.77 V. The input voltage is 60 mv. Thus H 0BP = = 2.8 9
10 Question 3 An engineer measures the 3dB frequencies of a symmetric bandpass filter as 9.34 khz and 0.2 khz. What is the resonant frequency (f 0 ) and Q of the filter? (3 points) For a symmetric narrowband bandpass filter f 0 = f L f H = = 9.77 khz The bandwidth of the filter is = 0.87 khz Question 4 Find the phase margin for a voltage follower that is driving a 0.0 μf capacitive load. Assume the opamp has an open loop gain of A o of 00 db, an f T of MHz, and an output resistance of 250 Ω. Assume the opamp is ideal except for A o, f T and R o. (5 points) Our approach is to find an expression for the loop gain T(s) and then find the frequency where T(jω) =. For the opamp f B = f T A o = = 0 Hz. Thus Now T(s) = A(s)β(s) = A o + s + sr o C = 05 ω + s s π T(jω) = + ω ω 20π T(jω) = tan ω 20π ω tan Set T(jω) = and solve for ω (using a spreadsheet or calculator) to find f = 248 khz. Substitute this in the expression for T(jω) to find T(jω) = 66. Thus, the phase margin is = 34 0
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