ecel303_lab7se - TITLE Waveforms Generators(VCO NAME Seher...

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Unformatted text preview: TITLE: Waveforms Generators (VCO) NAME: Seher Ahmad PARTNER: Palak Chandra TA: Nicholas Vacirca DATE PERFORMED: 05/25/2007 DATE DUE: 06/01/2007 DATE RECEIVED Drexel University Electrical and Computer Engineering Dept. Electrical Engineering Laboratory III, ECEL-303 WAVEFORM GENERATORS (VOC) OBJECT:- The objective of this lab was to learn about electronic waveform generators. This was done using standard IC chips to produce various waveforms and a frequency modulation circuit. For the purpose of this lab, the voltage-controlled oscillator (VCO) chip ICL 8038 was used. A symmetrical square and triangular wave generator was first designed and then built and tested. CIRCUIT DIAGRAMS:- Fig. 1. Voltage Controlled Oscillator Block Diagram Obtained by Seher Ahmad and Palak Chandra on 05/25/2007 R A (variable), R B = 10 kΩ, C T = 37nF, V cc = 24V (theoretical) Fig. 2. Basic Oscillator Circuit Diagram (Part 1) Obtained by Seher Ahmad and Palak Chandra on 05/25/2007 C T = 37nF, V cc = 24V, V DC = 0V ~ 9V (theoretical) Fig. 3. Circuit Setup for DC Sweep Operation (Part 2) Obtained by Seher Ahmad and Palak Chandra on 05/25/2007 C T = 37nF, V cc = 24V, V DC = 0V ~ 9V (theoretical) Fig. 4. Circuit Setup for FM Modulation Operation (Part 3) Obtained by Seher Ahmad and Palak Chandra on 05/25/2007 DATA SHEET AND CALCULATIONS:- R B (kΩ) R A (kΩ) Duty Cycle f (Hz) T (ms) 9.9756 6.864 25% 684.9 1.4601 9.9756 9.682 50% 907.4 1.1020 9.9756 15.582 66% 809.7 1.2350 9.9756 19.367 75% 676.8 1.4775 Table 1. Values of R A , f and T for various duty cycles (Part 1a-d) Obtained by Seher Ahmad and Palak Chandra on 05/25/2007 Measured Frequency (Hz) Calculated Period (ms)* Calculated Frequency (Hz)* Percentage Error (%)* 907.4 1.113 898.873 0.9486 684.9 1.399 714.811 4.1845 809.7 1.277 783.229 3.3797 676.8 1.453 688.140 1.6479 Table 2. Measured and calculated values of frequency and time period, and percentage error in frequency (Part 1) Obtained by Seher Ahmad and Palak Chandra on 05/25/2007 C T (µF) Frequency (kHz) Duty Cycle (%) 0.0001 144.700 33.8 0.0010 21.8000 48.5 0.0100 2.50000 49.8 0.1000 0.31250 50.0 1.0000 0.03165 50.0 Table 3. Variation of frequency and duty cycle with variance in capacitance from 0.1nF over five orders of magnitude (Part 1g) Obtained by Seher Ahmad and Palak Chandra on 05/25/2007 V DC (V) Frequency (kHz) 0.0270 1 0.2020 2 0.3810 3 0.5634 4 0.7407 5 0.9091 6 1.0810 7 1.2500 8 1.42901....
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This note was uploaded on 12/02/2011 for the course ECEL 353 taught by Professor Gerber during the Spring '11 term at Hanoi University of Technology.

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ecel303_lab7se - TITLE Waveforms Generators(VCO NAME Seher...

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