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Selectivity and sensitivity enhancement methods for high‐data‐rate super‐regenerative receiver
Author(s) -
Mousavi Samaneh,
Saeedi Saeed
Publication year - 2017
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.2337
Subject(s) - sensitivity (control systems) , electronic engineering , waveform , topology (electrical circuits) , cmos , bit error rate , bandwidth (computing) , computer science , control theory (sociology) , electrical engineering , engineering , voltage , channel (broadcasting) , telecommunications , control (management) , artificial intelligence
Summary This paper describes selectivity and sensitivity performance evaluations and improvement methods for an on–off keying super‐regenerative (SR) receiver. A slope‐controlled quasi‐exponential quench waveform, generated by a low‐complexity PVT‐tolerant quench generator circuit, is proposed to increase data rate and reduce the receiver 3‐dB bandwidth, thereby preventing oscillation caused by out‐of‐band injected signals and improving the receiver selectivity. The SR receiver sensitivity is also enhanced by a noise‐canceling front‐end topology with single‐ended to differential (S2D) signal converter. To exemplify these techniques, we designed an SR receiver with the proposed front‐end and quench waveform generator in a 0.18‐μm CMOS technology. Theoretical analyses and circuit simulations show 30% and 65% reduction in 3‐dB bandwidth of the SR receiver at 25 Mbps data rate by employing the proposed quench signal compared with piecewise‐linear and trapezoidal quench waveforms, respectively. Performance of the proposed front‐end is evaluated by a fast bit‐error‐rate estimation procedure, based on circuit noise simulations and statistical analyses, without the need for time‐consuming transient‐noise simulations. Accuracy of the procedure has been verified by comparing its results with transient‐noise simulations. According to the estimated bit‐error‐rate curves, the noise‐canceling topology with S2D converter enhances the SR receiver sensitivity by 9 dB. Copyright © 2017 John Wiley & Sons, Ltd.