article · Dutse Journal of Pure and Applied Sciences
An amplitude modulation network was designed and simulated for analog telecommunications applications. The architecture incorporates three primary functional units: a multiplier built using logarithmic and anti-logarithmic amplifiers, a phase-shift audio signal oscillator, and a Hartley radio frequency oscillator. The complete system was evaluated using Multisim software to assess output voltages, modulation index, and modulation depth across under-modulation, complete modulation, and over-modulation conditions. When evaluated against a benchmark circuit configuration comprising a diode multiplier, a Wien bridge oscillator, and a Colpitts oscillator, the proposed network demonstrated higher output voltages, reaching up to 6.223 volts. It also produced improved modulation depths across the majority of test conditions while remaining consistent with operational standards despite minor component variations.
Amplitude modulation remains an essential technique within analog telecommunications. Refining circuit architectures can enhance signal strength and modulation performance without adding excessive complexity. Demonstrating that amplifier-based multipliers and standard oscillators can surpass traditional diode-based designs provides circuit designers with an effective approach to improving signal quality in analog communication systems.
This network design could support analog radio transmission hardware, communication modules, and educational electronics kits for engineers and telecommunications manufacturers. The work represents an early-stage simulation study conducted in Multisim software. Practical adoption would require physical hardware prototyping, operational component sourcing, and empirical testing to confirm performance under real-world operating conditions and environmental interference.
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This paper presents amplitude modulation network design and simulation for analog telecommunications application. The design consists of three sections; a novel Amplitude modulator (Multiplier) which was designed using the logarithmic and anti-logarithmic amplifiers, the audio signal oscillator made up of phase-shift oscillator and the Radio frequency (RF) signal oscillator made up of Hartley oscillator. The complete system was simulated using Multisim software version 14.2 and modulation index calculated at under modulation, 100 percent modulation and over modulation which were compared with other literature where the complete AM modulator was designed using a diode as the multiplier, wien bridge circuit as the Audio signal Oscillator and colpitt oscillator as the RF signal Oscillator. Results show that the designed network 1 has output voltages 0.993mV at 100mV, X-Input and 10mV Y-Input to 6.223V at 2.5V at both X and Y input before decreasing to 5.974V at 3V XInput and 2V Y-Input, greater than the network 2 from literature. Also the modulation index (ɸ1) with values 0.56, 0.60, 1.00, 1.75, 2.15 as against (ɸ2) 0.4915, 0.6938, 0.9956, 1.4725 and 1.8042, while depth of modulation of this study (ß 1 ) has higher values of 56%, 60%, 100%, 175%, and 215% than modulation depth values of 49.15%, 69.38%, 99.56%, 147.25% and 180.42%, Except at 700mV message and 1V carrier amplitude where (ß 2 ) is higher than (ß 1 ), when compared with literature was found to be better than that of network 2. Overall, the designed AM modulator (Network 1) was found to be superior in performance in terms of Output Voltages and modulation Index. Also it is in line with standards with little deviation due to component variation. Recommendations were also made for further improvements to functionality.
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DOI: 10.4314/dujopas.v11i1a.34
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