Analysis of AM modulation and demodulation using LTspice circuit simulator

Junyang Zhang

doi:10.1117/12.2631922

14 April 2022 Analysis of AM modulation and demodulation using LTspice circuit simulator

Junyang Zhang

Proceedings Volume 12178, International Conference on Signal Processing and Communication Technology (SPCT 2021); 1217810 (2022) https://doi.org/10.1117/12.2631922
Event: International Conference on Signal Processing and Communication Technology (SPCT 2021), 2021, Tianjin, China

Abstract

For most students and researchers, the actual hardware equipment for studying the classic AM modulation and demodulation is extremely costly and hard to access especially during the pandemic time. Besides, the widely used envelope detector in AM demodulation is typically associated with the problems of distortion and low-quality recovered signal, although it is cheap and simply structured. To comprehensively study AM modulation and demodulation process and to generate better output signal from the demodulator with minimized distortion, this paper presents an approach for students and researchers using the free electric circuit simulator LTspice, along with a combined circuit design strategy of the AM input driver and the envelope detector. The circuit design and the simulation performed by this software show students and researchers a clear and comprehensive transient analysis of the results of this experiment. Meanwhile, by following these parameter setting rules, high-quality AM recovered signal can be obtained with minimized distortion.

Citation Download Citation

Junyang Zhang "Analysis of AM modulation and demodulation using LTspice circuit simulator", Proc. SPIE 12178, International Conference on Signal Processing and Communication Technology (SPCT 2021), 1217810 (14 April 2022); https://doi.org/10.1117/12.2631922

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