01.Test 2 ELE552 Sep-Dec-2014

CONFIDENTIALUNIVERSITI TEKNOLOGI MARA TEST 2 COURSE : ELECTRONIC CIRCUIT DESIGN COURSE CODE : ELE 552 DATE : 19 DECEMBER 2014 TIME : 2 HOURS FACULTY : ELECTRICAL ENGINEERING SEMESTER : SEP – DEC 2014 PROGRAM : EE200 INSTRUCTION TO CANDIDATES 1. This question paper consists of three (3) questions. Answer ALL questions. 2. Submit your answer script together with this question booklet.Start each answer on a new page. ----------------------------------------------------------------------------------------------------------------------------------------------------- FILL IN THE FOLLOWING PARTICULARS: 1. Name : ____________________________________________ 2. Matrix No. : 3. Program Code : EE200 4. Group : EE200___________ 5. LECTURER : _______________________ Question 1a 1b 1c 2a 2b 2c Total (2M) (5M) (8M) (4M) (3M) (8M) (30m) CO CO2 CO2 CO3 CO2 CO2 CO3 PO PO1 PO1 PO2 PO1 PO1 PO2 Marks DO NOT TURN THIS PAGE UNTIL YOU ARE TOLD TO DO SO This test paper consists of 4 printed pages including the cover page © Hak Cipta Universiti Teknologi MARA CONFIDENTIAL (2 marks) Figure Q1(b) (c) The op-amp which has the slew rate as calculated in Figure Q1(b) above is connected as a noninverting amplifier with a gain of 20 and must have a flat response up to 30 kHz. φ mathematical expressions that are used to calculate the results. dc open-loop gain. (2 marks) (b) Figure Q1(b) shows a voltage-follower large signal pulse response of an op-amp. (3 marks) (d) The 741C op-amp is wired as noninverting amplifier with these parameters: break frequency. f o = 5 Hz . Determine the approximate slew rate of this amplifier.CONFIDENTIAL TEST 1/OCT 2014/ELE 552 2 QUESTION 1 (a) State two (2) main effects on the gain (magnitude) and the phase-shift between the output and input signals that resulted from increasing the operating frequency of an amplifier. Assume ideal op-amp is available. Write the completed loop gain magnitude. Determine the maximum peak-peak input signal. AOL = 2 × 10 5 and closed-loop gain. AOL ⋅ B and phase shift. Assume that input is a sinusoidal signal and the op-amp is initially nulled. (8 marks) © Hak Cipta Universiti Teknologi MARA CONFIDENTIAL . Determine the closed-loop bandwidth. Vi(p-p) that can be applied without distorting the output. f F and also determine the stability of this circuit by filling up Table Q1(d). ACL = 20 . (5 marks) © Hak Cipta Universiti Teknologi MARA CONFIDENTIAL . fL of 10 kHz. Write the open- loop gain expression. Determine the magnitude of the open-loop gain and phase shift between the input and output of the op-amp if the frequency of operation is 10 kHz. Chebychev and Elliptic.CONFIDENTIAL TEST 1/OCT 2014/ELE 552 3 Table Q1(d) Frequency. (5 marks) Figure Q1(e) QUESTION 2 (a) Differentiate the characteristics of three types of practical active filters. (3 marks) (b) Design a first-order high-pass Butterworth filter to have a gain of 16 in the passband and a low cut-off frequency. φ (Hz) AOL ⋅ B (dB) (degree) 0 5 50 500 5k 50k 100k 1M (e) The frequency response of a certain op-amp is shown in Figure Q1(e). namely Butterworth. Phase shift. AOL(f) for the op-amp as a function of break frequencies and dc gain AOL. f Loop gain magnitude. (2 marks) (c) Determine the condition for sustained oscillations for the maximum oscillation frequency as in part (b) above. This speech signal is corrupted by high frequency noise signal consists of frequency components greater than 100 kHz. C1 = 15 pF and CV is a variable between 10 pF and 35 pF. Vo(p) at frequencies of 5 kHz. determine the range of oscillation frequency. (a) Derive the expression for the frequency of oscillation. (8 marks) QUESTION 3 Figure Q3 shows a Wein bridge oscillator to generate a sinusoidal waveform. (3 marks) Figure Q3 END OF TEST PAPER © Hak Cipta Universiti Teknologi MARA CONFIDENTIAL .2 mV is applied. Sketch the frequency response of this filter design with appropriate details. fo. 10 kHz and 20 kHz. The filter should be designed to have a unity gain and provides attenuation of the noise components by at least –70 dB.CONFIDENTIAL TEST 1/OCT 2014/ELE 552 4 (c) For the designed circuit of part (b) above. determine the output voltage peak amplitude. fo. if an input voltage peak amplitude of Vi(p) = 2. Determine the number of poles required in this design. (5 marks) (b) If these parameters are given: R = 20 kΩ. (4 marks) (d) A low-pass Butterworth filter is to be designed to pass through speech signal consists of 300 Hz to 4 kHz frequency components.