Design of Coherent Envelope Measurement Circuit Based on Direct Digital Frequency Synthesizer

Abstract

Envelope detection and measurement has important applications in many   domains such as instrumentation, sensors characterization, analog and digital communications. Instead of other envelope detection methods that use analog circuits or digital filters, we propose an electronic circuit that operates measurement in coherent mode. After reproduction of the input wave frequency using direct digital synthesizers, we place the envelope on a new low reference frequency signal followed by an analog measurement block based on analog multipliers and low-pass filters. Design circuit, simulation and experimental results are presented to validate the measurement for different values of input and reference frequencies.

References

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8. Puteri Nor Aznie Fahsyar, S.M.; Soin, N. Performance comparison of envelope detector for RFID applications, Technical Postgraduates (TECHPOS), 2009 International Conference for , vol., no., pp.1,3, 14-15 Dec. 2009

9. Xiao-li Yin , Jing-jing Han , Can Xu , Ji Hao , Xiang-jun Xin ,Li Li, Photonic envelope detection and fiber transmission of 24 GHz IR-UWB signal based on phase modulation, Optoelectronics Letters, January 2015, Volume 11, Issue 1, pp 57-60.
10. Otani, A., Tsuda, Y., Hirabayashi, F. and Igawa, K., Advanced envelope detection method with novel optical PLL for optical sampling trigger, Electronics Letters , vol.41, no.18, pp.1019,1021, 1 Sept. 2005.
11. Nilsson, E. and Svensson, C. Envelope detector sensitivity and blocking characteristics, Circuit Theory and Design (ECCTD), 2011 20th European Conference on , vol., no., pp.773,776, 29-31 Aug. 2011.
12. Tierney. J., Rader. C. M. and Gold. B. A digital frequency synthesizer, IEEE Transactions on Audio and Electroacoustics, vol. 19, pp. 4857, 1971.