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Sensors 2013, 13(5), 6775-6792; doi:10.3390/s130506775
Article

A Fully Integrated Sensor SoC with Digital Calibration Hardware and Wireless Transceiver at 2.4 GHz

* ,
 and
The Department of Multimedia-IP Research Center, Korea Electronics Technology Institute, #68 Yatap-dong Seongnam-si Bundang-gu, Gyeonggi-do 463-816, Korea
* Author to whom correspondence should be addressed.
Received: 12 April 2013 / Revised: 14 May 2013 / Accepted: 14 May 2013 / Published: 21 May 2013
(This article belongs to the Section Physical Sensors)
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Abstract

A single-chip sensor system-on-a-chip (SoC) that implements radio for 2.4 GHz, complete digital baseband physical layer (PHY), 10-bit sigma-delta analog-to-digital converter and dedicated sensor calibration hardware for industrial sensing systems has been proposed and integrated in a 0.18-μm CMOS technology. The transceiver’s building block includes a low-noise amplifier, mixer, channel filter, receiver signal-strength indicator, frequency synthesizer, voltage-controlled oscillator, and power amplifier. In addition, the digital building block consists of offset quadrature phase-shift keying (OQPSK) modulation, demodulation, carrier frequency offset compensation, auto-gain control, digital MAC function, sensor calibration hardware and embedded 8-bit microcontroller. The digital MAC function supports cyclic redundancy check (CRC), inter-symbol timing check, MAC frame control, and automatic retransmission. The embedded sensor signal processing block consists of calibration coefficient calculator, sensing data calibration mapper and sigma-delta analog-to-digital converter with digital decimation filter. The sensitivity of the overall receiver and the error vector magnitude (EVM) of the overall transmitter are −99 dBm and 18.14%, respectively. The proposed calibration scheme has a reduction of errors by about 45.4% compared with the improved progressive polynomial calibration (PPC) method and the maximum current consumption of the SoC is 16 mA.
Keywords: system-on-a-chip; IEEE 802.15.4; wireless PAN; sensor calibration; Internet of Things system-on-a-chip; IEEE 802.15.4; wireless PAN; sensor calibration; Internet of Things
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Kim, D.-S.; Jang, S.-J.; Hwang, T.-H. A Fully Integrated Sensor SoC with Digital Calibration Hardware and Wireless Transceiver at 2.4 GHz. Sensors 2013, 13, 6775-6792.

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