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Lee J.,Institute of Microelectronics, Singapore | Cho S.,KAIST
IEEE Journal of Solid-State Circuits | Year: 2012

This paper presents a trim-free low-voltage and low-power CMOS current reference which achieves high current stability to temperature variation. In order to achieve process-insensitive temperature compensation, the proposed circuit employs ratio between the process-independent temperature coefficients of resistor and compensation voltage. The proposed current reference is implemented in 0.18-μm CMOS technology and consumes 1.4 μW from a 1-V supply. It achieves temperature coefficient of 24.9 ppm/°C with 0 °C to 100 °C of temperature variation without trimming, which is the lowest among the recently reported CMOS current references. © 1966-2012 IEEE. Source

STMicroelectronics and Institute of Microelectronics, Singapore | Date: 2010-02-26

Switches that are actuated through exposure to a magnetic field are described. Such switches include conductive portions that are electrically separate from one another when in an open switch configuration. A mobile element of a switch includes one or more anchoring members that are in electrical contact with one of the conductive portions. The mobile element also has a beam that is attached to the one or more anchoring members. The beam can be attached to the one or more anchoring members by flexures. In some cases, the beam includes a plurality of strips. The beam has an end portion that is configured to move toward the other conductive portion when exposed to an external force, such as a magnetic field. When the mobile element electrically contacts the other conductive portion of the substrate, an electrical pathway is established between the conductive portions, giving rise to a closed switch configuration. Various configurations of anchoring members may significantly decrease initial upward beam deformation upon manufacture of the mobile element, resulting in an increased sensitivity upon exposure to a magnetic field. Methods for manufacturing switches that exhibit increased sensitivity to magnetic fields are also disclosed. Switches described can be formed using semiconductor manufacturing techniques. Methods described also include forming a beam that is attached to one or more anchoring members where an end portion of the beam moves in a substantially downward direction upon exposure to a magnetic field of sufficient intensity.

Arya S.K.,Institute of Microelectronics, Singapore | Lim B.,Agency for Science, Technology and Research Singapore | Rahman A.R.A.,Institute of Microelectronics, Singapore
Lab on a Chip - Miniaturisation for Chemistry and Biology | Year: 2013

Circulating Tumor Cells (CTCs) are shed from primary or secondary tumors into blood circulation. Accessing and analyzing these cells provides a non-invasive alternative to tissue biopsy. CTCs are estimated to be as few as 1 cell among a few million WBCs and few billion RBCs in 1 ml of patient blood and are rarely found in healthy individuals. CTCs are FDA approved for prognosis of the major cancers, namely, Breast, Colon and Prostate. Currently, more than 400 clinical trials are ongoing to establish their clinical significance beyond prognosis, such as, therapy selection and companion diagnostics. Understanding the clinical relevance of CTCs typically involves isolation, detection and molecular characterization of cells, ideally at single cell level. The need for highly reliable, standardized and robust methodologies for isolating and analyzing CTCs has been widely expressed by clinical thought leaders. In the last decade, numerous academic and commercial technology platforms for isolation and analysis of CTCs have been reported. A recent market report highlighted the presence of more than 100 companies offering products and services related to CTCs. This review aims to capture the state of the art and examines the technical merits and limitations of contemporary technologies for clinical use. This journal is © The Royal Society of Chemistry. Source

Zhu S.,Institute of Microelectronics, Singapore | Lo G.-Q.,Institute of Microelectronics, Singapore
Journal of Lightwave Technology | Year: 2016

Vertically stacked hydrogenated amorphous silicon (a-Si:H) and aluminum nitride (AlN) photonic circuits are fabricated on bulk silicon using complementary metal-oxide semiconductor back-end-of-line-compatible technology. The 0.5 μm × 0.22 μm a-Si:H and 1 μm × 0.4 μm AlN channel waveguides exhibit relatively low propagation losses of ∼3.8 and ∼1.4 dB/cm at 1550-nm telecom wavelengths, respectively, thus enabling the realization of various high-performance photonic devices on these two layers, such as multimode interference power splitters, waveguide ring resonators, arrayed-waveguide gratings, etc. In particular, the a-Si:H layer is suitable for ultra-compact thermo-optic (TO) devices because of its large refractive index of ∼3.5 and large TO coefficient (TOC) of ∼2.60 × 10-4 K-1, whereas the AlN layer is suitable for large-size temperature-insensitive devices because of its relatively small refractive index of ∼2.0 and small TOC of ∼3.56 × 10-5 K-1. A cascade directional coupler structure is proposed for connection between these two layers, which provides coupling efficiency of ∼ -1.0 dB, as estimated from numerical simulations. The feasibility of stacking different photonic layers on bulk Si paves the way to realize complex 3-D photonic circuits on chip which are not possible in the conventional single-layer configuration. © 1983-2012 IEEE. Source

Neuzil P.,Institute of Microelectronics, Singapore | Wong C.C.,Institute of Microelectronics, Singapore | Wong C.C.,Nanyang Technological University | Reboud J.,Institute of Microelectronics, Singapore
Nano Letters | Year: 2010

Herein we demonstrate giant piezoresistance in silicon nanowires (NWs) by the modulation of an electric field-induced with an external electrical bias. Positive bias for a p-type device (negative for an n-type) partially depleted the NWs forming a pinch-off region, which resembled a funnel through which the electrical current squeezed. This region determined the total current flowing through the NWs. In this report, we combined the electrical biasing with the application of mechanical stress, which impacts the charge carriers' concentration, to achieve an electrically controlled giant piezoresistance in nanowires. This phenomenon was used to create a stress-gated field-effect transistor, exhibiting a maximum gauge factor of 5000, 2 orders of magnitude increase over bulk value. Giant piezoresistance can be tailored to create highly sensitive mechanical sensors operating in a discrete mode such as nanoelectromechanical switches. © 2010 American Chemical Society. Source

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