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Energy harvesting enables the remote sensors of the wireless sensor network to obtain power from the environment for their entire lifetime. For indoor remote sensors, amorphous silicon photovoltaic (PV) cell can be used to harvest energy from indoor lighting. Furthermore, if the power consumption of the sensor is low, e.g., the image sensor in [1], the(More)
A 7-GHz CMOS voltage controlled ring oscillator that employs multiloop technique for frequency boosting is presented in this paper. The circuit permits lower tuning gain through the use of coarse/fine frequency control. The lower tuning gain also translates into a lower sensitivity to the voltage at the control lines. Fabricated in a standard 0.13m CMOS(More)
This paper presents a chip level 9 bits Charge Folding Successive-Approximation-Register (SAR) Analog-to-Digital Converter (ADC) to be used in a CMOS image sensor for retinal prosthesis. It has a maximum single-ended input range of 1.8 V but only uses a supply voltage of 0.9 V for the entire ADC through the Charge Folding method. Therefore, the input range(More)
http://www.ieee.org/publications_standards/publications/rights/index.html for more information. This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication. Citation information: DOI 10.1109/TCSII.2014.2331113, IEEE Transactions on Circuits and Systems II:(More)
In this paper, the design of a 1.2 V charge pump circuit suitable for PLL-based frequency synthesizer with low spurious tone requirement is presented. The proposed charge pump circuit improves current matching in a wide output voltage range by applying a replica biasing technique with a new feedback structure that provides more stable operation. The(More)