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Unformatted text preview: ECE 146A: Communications I Lab 4: Amplitude Modulation and Demodulation – Hardware Lab report due Thursday Feb 24 (at the beginning of the lab session) (at the beginning of class) 1 Objective The goal of this lab is to get a hands on feel for amplitude modulation (AM) by implementing and verifying various techniques for performing amplitude modulation and demodulation, such as a balanced modulator and a synchronous detector. You will utilize integrated circuit chips and simple nonlinear circuits. 2 Laboratory Room Harold Frank Hall, Room 5160. Note that you will work in groups of two students, but each student must submit a separate lab report. 3 Equipment Along with an oscilloscope, a digital multimeter (DMM), a function generator, and a power supply, you will need the following equipment: 1. MC1496 balanced modulator/demodulator. 2. LF353 wideband dual JFET operational amplifier. 3. Various resistors, capacitors, and diodes. 4. Breadboard. 5. Cables: BNC to IC clips (3 each), banana cable for DC power supply (3 each), DMM test leads (1 each). 6. Needle nose pliers and wire cutters. 7. Wire. 8. Card key for room 5160. Most of these items can be purchased as a lab kit from the Electronics Shop on the first floor of Engineering I. 1 DSB-SC CIRCUIT DIFFERENTIAL CIRCUIT SPECTRUM ANALYZER 0.1 μ F 0.1 μ F 12 6 1 1 3 2 V (t) s V (t) c V (t) m 0.1 μ F Figure 1: DSB-SC modulator using the MC1496. 4 Background 4.1 MC1496 Balanced Modulator/Demodulator The MC1496 is a monolithic transistor array integrated circuit (IC) arranged as a balanced modula- tor/demodulator. It was designed for use where the output voltage is a product of an input voltage (the message) and a switching function (the carrier). Typical applications include double-sideband suppressed-carrier (DSB-SC) modulation, conventional amplitude modulation (AM), synchronous detection, frequency modulation (FM) detection, phase detection, and chopper applications. Re- fer to the MC1496 data sheet located at the ECE 146A web site. In particular, observe the pin connection diagram and the signal waveforms for the various modulation formats....
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- Fall '09
- Carrier wave, LPF