Electronics, Communication & Automation Technology

A Compact Super-Regenerative Receiver with
Reference-Class Accuracy of Frequency
 

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  •  School of Electronic and Information Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
郑卫国(1972-),男,博士生,工程师,主要从事射频及混合信号集成电路研究

Received date: 2017-08-18

  Revised date: 2017-12-06

  Online published: 2018-03-01

Supported by

 Supported by the National Science and Technology Major Project of China (2010ZX03001-004-03)

Abstract

 To overcome the poor frequency accuracy and selectivity of the conventional superregenerative receiver (SRR),a SRR based on crystal has been proposed for low-data rate and low distance wireless sensor network (WSN). This SRR adopts a crystal oscillator (XO) as a superregenerative oscillator (SRO) instead of the conventional LC or RC oscillator. With the help of the ultra-high quality factor of the crystal this SRR has achieved the same accuracy and stability of working frequency as a crystal,and is immune to variations of process,voltage and temperature. A prototype chip, implemented in 0. 18-μm CMOS technology,utilizes a bi-direction driver to overcome the challenges of slow start-up and fully quenching,makes a reference XO work in a super-pre-generative manner,and then achieves sensitivity of -78dBm (1kb/s data rate). The measured data show 50 times improvement on the frequency selectivity,and 7 ×10 -6 frequency error from the target frequency,which matches the reference-class accuracy. This receiver supplies a very compact solution with only a crystal being needed outside except several decoupling capacitors,which is suitable for WSN applications,e. g. wireless capsule endoscopy. 

Cite this article

ZHENG Weiguo CAI Min HE Xiaoyong .

A Compact Super-Regenerative Receiver with
Reference-Class Accuracy of Frequency
 
[J]. Journal of South China University of Technology(Natural Science), 2018 , 46(3) : 65 -71 . DOI: 10.3969/j.issn.1000-565X.2018.03.010

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