Ultralow-Power Optical CDR for Integrated Photovoltaic Energy-Harvesting Sensors

作者：Shaik Khadar^*; Kleeburg Travis; Amirtharajah Rajeevan

来源：IEEE Transactions on Circuits and Systems II-Express Briefs, 2013, 60(12): 832-836.

DOI：10.1109/TCSII.2013.2285995

• clock-data recovery (CDR)
• jitter
• nonuniform sampling
• optical wireless sensor node

Energy storage elements and electromechanical timing references, such as crystals, can dominate energy-autonomous wireless sensor node volume at the 1-mm(3) scale. This brief proposes a clock-data recovery circuit that receives power from integrated photovoltaics and extracts clock and data signals from optical data input. A prototype fabricated in 90-nm CMOS was tested over a V-DD range of 150-500mV, and it supports maximum data rates from 15 kb/s to 4 Mb/s while dissipating 51 nW-3.5 mu W. A software implementation of the conjugate gradient method running on an ultralow-power embedded microcontroller was investigated for its potential to compensate for jitter when the recovered clock is used to sample a sensor input. The output signal-to-noise-and-distortion ratio of an analog-to-digital converter can be improved by up to 16-28 dB for an estimated microcontroller power consumption of 15 mu W.

• 出版日期2013-12