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Papers by Sriram Muthukumar

Journal of Electronic Materials, 2004

Proceedings Electronic Components and Technology Conference, 2006

MRS Proceedings, 2006

... of the ICICDT, 2005, p.15-18. 4. PR Morrow, MJ Kobrinsky, S. Ramanathan, C.-M. Park, M. Harme... more ... of the ICICDT, 2005, p.15-18. 4. PR Morrow, MJ Kobrinsky, S. Ramanathan, C.-M. Park, M. Harmes, V. Ramachandrarao, H.-M. Park, G. Kloster, S. List, S. Kim, “Wafer-level 3D interconnects via Cu bonding”, Proc. of the Advanced Metallization Conference, 125-130 (2004). ...

Volume 4: Electronics and Photonics, 2010

Handbook of 3D Integration, 2008

Journal of Infrared, Millimeter, and Terahertz Waves, 2011

Extremely high frequency (EHF) bands above 50 GHz have been proposed to be used as backhaul links... more Extremely high frequency (EHF) bands above 50 GHz have been proposed to be used as backhaul links of modern cellular mobile networks. They provide interconnectivity between the base stations and the core network. In this paper, we propose the employment of cooperative techniques in backhaul networks. More specifically, the outage performance analysis of a simple cooperative diversity system operating at EHF bands is presented. The destination node combines the direct link with the signal received through a regenerative relay using selection combining. A combined statiform and convective model of rainfall rate for the rain attenuation prediction is considered. The correlation properties and the joint statistics among the microwave paths are also calculated. Numerical results present the impact of the geometrical parameters and the climatic conditions on the outage performance.

Scientific Reports, 2016

We demonstrate for the first time a wearable biochemical sensor for monitoring alcohol consumptio... more We demonstrate for the first time a wearable biochemical sensor for monitoring alcohol consumption through the detection and quantification of a metabolite of ethanol, ethyl glucuronide (EtG). We designed and fabricated two co-planar sensors with gold and zinc oxide as sensing electrodes. We also designed a LED based reporting for the presence of EtG in the human sweat samples. The sensor functions on affinity based immunoassay principles whereby monoclonal antibodies for EtG were immobilized on the electrodes using thiol based chemistry. Detection of EtG from human sweat was achieved through chemiresistive sensing mechanism. In this method, an AC voltage was applied across the two coplanar electrodes and the impedance across the sensor electrodes was measured and calibrated for physiologically relevant doses of EtG in human sweat. EtG detection over a dose concentration of 0.001-100 μg/L was demonstrated on both glass and polyimide substrates. Detection sensitivity was lower at 1 μg/L with gold electrodes as compared to ZnO, which had detection sensitivity of 0.001 μg/L. Based on the detection range the wearable sensor has the ability to detect alcohol consumption of up to 11 standard drinks in the US over a period of 4 to 9 hours.

Volume 1: Development and Characterization of Multifunctional Materials; Mechanics and Behavior of Active Materials; Modeling, Simulation and Control of Adaptive Systems, 2015

2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121), 2000

Temperature stable SAW filters are needed in many communication and sensor applications. The ZnO/... more Temperature stable SAW filters are needed in many communication and sensor applications. The ZnO/SiO2/Si structure is particularly attractive, as ZnO and Si have positive TCD whereas SiO2 has negative TCD, from which temperature compensation may be achieved. Furthermore, it allows integration of surface acoustic wave devices with Si circuits for compact communications and sensor systems. In this work, temperature compensated

Proceedings of the IEEE Ultrasonics Symposium

ABSTRACT

Scientific Reports, 2015

An ultra-sensitive and highly specific electrical double layer (EDL) modulated biosensor, using n... more An ultra-sensitive and highly specific electrical double layer (EDL) modulated biosensor, using nanoporous flexible substrates for wearable diagnostics is demonstrated with the detection of the stress biomarker cortisol in synthetic and human sweat. Zinc oxide thin film was used as active region in contact with the liquid i.e. synthetic and human sweat containing the biomolecules. Cortisol detection in sweat was accomplished by measuring and quantifying impedance changes due to modulation of the double layer capacitance within the electrical double layer through the application of a low orthogonally directed alternating current (AC) electric field. The EDL formed at the liquid-semiconductor interface was amplified in the presence of the nanoporous flexible substrate allowing for measuring the changes in the alternating current impedance signal due to the antibody-hormone interactions at diagnostically relevant concentrations. High sensitivity of detection of 1 pg/mL or 2.75 pmol cortisol in synthetic sweat and 1 ng/mL in human sweat is demonstrated with these novel biosensors. Specificity in synthetic sweat was demonstrated using a cytokine IL-1β. Cortisol detection in human sweat was demonstrated over a concentration range from 10-200 ng/mL.

2012 IEEE 62nd Electronic Components and Technology Conference, 2012

ABSTRACT Coreless packaging is an attractive option to meet the low z-height requirements typical... more ABSTRACT Coreless packaging is an attractive option to meet the low z-height requirements typically demanded in low-profile mobile devices. In order to deliver high quality, fully functional assembled coreless packages several aspects of this technology need to be studied to understand the benefits and the drawbacks. Towards realizing this goal, a prototype coreless BGA package for an existing product was designed, fabricated, and characterized for power delivery and IO signal integrity. A comparative study of performance was performed on a 45nm CPU in a coreless BGA package, and compared to the same 45nm CPU in the standard cored BGA. This paper reviews the design strategies implemented and characterization data collected to achieve matched electrical performance with the existing cored package. The paper first makes comparisons between cored and coreless designs and then presents the detailed physical design concepts. Next the paper focuses on electrical performance analysis including both IO performance and power delivery analysis, and then reviews the validation data collected. The results of this study show that the IO performance is comparable between the cored and coreless packages for both microstrip and the stripline routing for both DDR3 and PCI Express Gen 2. Additionally, the power delivery study shows that the expected benefit from the removal of PTH's is compromised in this prototype design due to the removal of die side capacitors and the reduction in the total number of land side capacitors. This made the coreless DC loadline virtually unchanged when compared to the cored package.

56th Electronic Components and Technology Conference 2006, 2006