Frequency-Domain Analysis of Super-Regenerative Amplifiers
Author(s)Dawson, Joel L.; Bohorquez, Jose L.; Chandrakasan, Anantha P.
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Since its invention in 1922, the super-regenerative amplifier (SRA) has been used in a variety of short-range, low-power, and/or low-cost wireless systems due to its simple implementation and excellent performance for a given power budget. Growing demand for ultralow-power receivers for short-range radios has recently reawakened an interest in the theory and design of SRAs. Building on recent work and using reasonable assumptions and approximations, we present a frequency-domain model for analyzing SRAs. We then use these models to predict the response of an SRA to arbitrary deterministic and stochastic signals including sinusoids, pulsed-sinusoids, and additive white Gaussian noise. Using the results, we present formulas for calculating the sensitivity and selectivity of SRAs. We also introduce the concept of a trigger-time that is particularly useful for accurately determining the optimal threshold in on-off keying (OOK) receivers and helps avoid the problems introduced by nonlinearity in SRAs. Finally, we present a prototype OOK SRA that achieves a sensitivity of -90 dBm at a bit rate of 300 kbps (BER of 10[superscript -3]) while consuming 500 muW, and show that its measured sensitivity matches theory within 1 dB.
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Microsystems Technology Laboratories
IEEE Transactions on Microwave Theory and Techniques
Institute of Electrical and Electronics Engineers
Bohorquez, J.L., A.P. Chandrakasan, and J.L. Dawson. “Frequency-Domain Analysis of Super-Regenerative Amplifiers.” Microwave Theory and Techniques, IEEE Transactions on 57.12 (2009): 2882-2894. ©2009 Institute of Electrical and Electronics Engineers.
Final published version
INSPEC Accession Number: 11019196
super-regenerative receiver, short-range radio, oscillators, low power, Super-regenerative amplifier (SRA)