Download Lab. 2 Diode and Rectifier Circuits - Fall 2007 | ECEN 3314 and more Lab Reports Electrical and Electronics Engineering in PDF only on Docsity! ECEN 3314 Electronic Devices and Applications Fall 2007 Lab. 2 Diode and Rectifier Circuits 1. Objective To investigate I-V curve of diodes, DC/AC circuits, the full wave rectifier circuit and other applications of diode circuits. 2. Components Required TL074 Op-Amp, 1N4007 rectifier diodes, 1N4148 switching diode, 1N5231 5.1V Zener diode, resistors and capacitors, all of the parts used in this lab are included in the lab kit. The data sheets of the parts can be found at: http://www.datasheetcatalog.com/ 3. Equipment Required Curve tracer, dual dc source, transformer, oscilloscope, function generator, digital multimeter. 4. Topics 1) Learn to use curve tracer. 2) Study the current dependence of the voltage drop on a Zener diode. 3) Voltage limiter. 4) Peak rectifier. 5) DC power supply. 6) DC/AC circuit. 5. Prelaboratory 1) Review OrCAD simulation tool. 2) Review Chapter 3 of Microelectronic Circuits, 5th edition, the textbook of ECEN 3314. P N R Vo(t) Vi(t) + - P N R (a) (b) Figure 1 When the diode is turned on, there is a finite voltage drop, for silicon pn junction diode, this value is around 0.7 V for moderate current. Sometimes an ideal diode without such offset is 1 required, and such a device can be constructed with the combination of an Op-Amp and an ordinary diode. The circuit shown in Figure 1(a) is a simple rectifier circuit, and a super diode can be constructed as in Figure 1(b). The amplitude of the sine wave is 0.5V, see what’s the difference in the output when an ordinary diode and the super diode is inserted into the circuit. Why call it super diode? 3) Estimate the values of the resistor R in the following circuit, so that the current is 100 mA, 1 mA and 10 mA (assuming there is 5 V voltage drop on the Zener diode). Refine your design with simulation. R 10Vdc D1N5231 Figure 2 4) Simulate the voltage limiter (double sided) circuit with a) two Zener diodes and b) two rectifying diodes; the input signal is a sine wave with 15 Vpp (peak-to-peak voltage). Z1 Z2 R vs(t) vo(t)D2D1 R vs(t) vo(t) (a) (b) Figure 3 5) Simulate the peak rectifier circuit with a capacitor of 47 mF, the input is a sine wave with frequency of 150 Hz and amplitude of 3 V, the load resistors should include 100 W, 1 kW, 10 kW and 100 kW. Why the output waveforms look so different? C RVs(t) Vo(t) Figure 4 2
