Laboratory Exercises for Analog Circuits and Electronics as Hardware Homework with Student Laptop Computer Instrumentation
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1 Laboratory Exercises for Analog Circuits and Electronics as Hardware Homework with Student Laptop Computer Instrumentation Marion O. Hagler Department of Electrical and Computer Engineering Mississippi State, MS USA
2 Introduction Since 1999, all ECE undergraduate students at MSU have laptop computers In spring 2005, first course in electronic circuits will require hardware homework Students construct circuits at home Measure circuit performance with audio capability of laptops as oscilloscope, spectral analyzer, and signal generator
3 Basic Approach By pair wise comparison of Analysis Measurement Simulation students Deploy complex, intensely interactive, learning environments Learn to self-assess their work
4 Circuits with inductors and capacitors Student laptop functions as: Signal generator Oscilloscope Spectrum analyzer Software (~US$90): Realtime Analyzer (DSSF3 Light version)
5 Circuits with inductors and capacitors Simple example: RC low pass filter
6 RC low pass filter: white noise spectral response R = 4700Ω, C = 0.1µF, f c 340 Hz
7 RC low pass filter: 500 Hz square wave response R = 4700Ω, C = 0.1µF, f c 340 Hz
8 RC low pass filter: square wave and white noise inputs 1000 Hz square wave white noise
9 RC low pass filter: impulse response R = 4700Ω, C = 0.1µF, RC = 0.47 msec
10 Non-inverting op amp configuration Op amp GBW 1 MHz
11 Non-inverting op amp configuration Analysis: Gain without feedback: With feedback: In both cases: Feedback conserves GBW A = G = GBW = A f LF A BW LF G LF f j f BW 1 j A G LF LF f f BW
12 Non-inverting op amp configuration Response when G = 96 Measured input: Measured output: Simulation:
13 Non-inverting op amp configuration Response when G = 342 Measured input: Measured output: Simulation:
14 Non-inverting op amp configuration Response when G = 535 Measured input: Measured output: Simulation:
15 Non-inverting op amp configuration Spectral response: G = measured (analytical) G = 112 (102) G = 399 (353) G = 563 (551) BW = 7 khz BW = 2.2 khz BW = 1.6 khz GBW = 786kHz GBW = 877 khz GBW = 901 khz
16 Wien bridge op amp oscillator: f = 1592 Hz R = 1000Ω, C = 0.1µF, f = 1592 Hz
17 Wienbridge op amp oscillator: f = 1592 Hz G = G = Waveform: Spectrum:
18 Wienbridge op amp oscillator: f = 1592 Hz G = Measured spectrum Simulated spectrum Simulated spectrum (unequal battery volts; (equal battery volts; (unequal battery volts; even harmonics) no even harmonics) even harmonics)
19 Op amp inverting integrator R = 10,000Ω, C = 10nF
20 Op amp inverting integrator Input signal Output signal (2000 Hz square wave) (2000 Hz triangular wave)
21 Resistive circuits Students purchase and use an inexpensive (<US$25) digital multimeter for measurements
22 Two loop, 5 resistor circuit Resistors: 1k, 2.2k, 4.7k, 10k, 15k Batteries: 9V, 9V
23 Two loop five resistor circuit Write mesh and node equations and solve with MATLAB Simulate circuit with OrCAD PSpice Measure circuit voltages and currents with digital multimeter Interactive learning: comparison of measurements and calculations
24 Two loop five resistor circuit Plot of the power dissipated in the load resistor vs. its resistance:
25 R-2R digital-to-analog converter R = 5000Ω
26 BJT RS latch R = 10kΩ
27 Discussion and Conclusion Approximate parts list Students already have bought shaded parts and used them for hardware homework in a first year course. Part description 15-Range Digital Multimeter, with battery RadioShack part number Price $US /4 Watt Resistor Assortment V Rectangular Battery (2) V Battery Snap Connectors Adjustable resistor, 10k Ohms µF Capacitor (2) µF Capacitor (2) Operational Amplifier IC General Purpose IC PC Board (5) Pin IC sockets (2 packages) Shielded Cables, 1/8" phone plug to alligator clips (2) Long-Nose Mini Pliers Soldering Pencil, 15-Watt Rosin Core Solder Total 77.86
28 Discussion and Conclusion In view of 3 years positive results with hardware homework in a first year course for ECE students, Promise of hardware homework to promote intensely interactive learning environments, Success of prototype projects, ECE faculty voted to Deploy hardware homework in first of restructured circuit and electronics courses in spring 2005 Strengthen labs in successive courses in view of stronger student lab experience in early courses
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a FEATURES High Common-Mode Rejection DC: 100 db typ 60 Hz: 100 db typ 20 khz: 70 db typ 40 khz: 62 db typ Low Distortion: 0.001% typ Fast Slew Rate: 9.5 V/ s typ Wide Bandwidth: 3 MHz typ Low Cost Complements