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A 3D imaging camera without moving parts, working with Time-Of-Flight (TOF) principle is introduced. This ranging system operates with near-infrared light emitted by active modulation light source, which is detected and demodulated by a low-cost CMOS array of pixels. Compared with other types of depth sensors, TOF camera sensor measures the amplitude, offset and phase of the received signal simultaneously...
Al2O3 films deposited as gate dielectrics on germanium (Ge) by atomic layer deposition (ALD) were post annealed in an ozone atmosphere at 450°C for 15, 25 and 35 minutes. The structure and chemical compound of Al2O3/Ge gate stacks were detected by X-ray photoelectron spectroscopy (XPS) measurements after ozone post annealing (OPA) treatments. It is confirmed by XPS measurements that this OPA treatment...
Motivated by reduction of computational complexity, this work develops a pipelined adaptive filter architecture using the sign-error least mean square (SELMS) algorithm. The proposed algorithm was implemented with less than half the amount of calculation consumed for the conventional architectures. Besides, the proposed designs derived by retiming technique and with low latency also provide a faster...
This paper describes algorithms and simulation verification of low-distortion sinusoidal signal generation methods with harmonics and image cancellation using an arbitrary waveform generator. We show high-frequency sinusoidal signal generation algorithms with HD3 image cancellation, HD3 & HD5 images cancellation, and point out that even harmonics images (such as HD2 image) is not required because...
This paper presents a 7.9 fJ/conversion-step 10-bit 125 MS/s successive approximation register (SAR) analog-to-digital converter (ADC) on the basis of a monotonic capacitor switching procedure. Simplified power-efficient digital control logic, multi-layer sandwich capacitor structure and high-speed level-shift bootstrapped sampling-and-holding (S/H) blocks are employed to achieve high performance...
Building energy accounts for large amount of the total energy consumption, and smart building energy control leads to high energy efficiency and significant energy savings. For energy-efficient smart building applications, accurate and robust measurement of temperature via emerging wireless sensor network is imperative. Many of the temperature sensors are battery-operated. As a result, it is crucial...
This paper described a disposable overoxidized polypyrrole/graphene/gold (OPPy/GE/Au) microelectrode by two-step electrooxidation at a three-electrode-integrated electrochemical sensor, and its application for selective determination of dopamine (DA) without the interference of ascorbic acid (AA). Compared with the bare Au electrode, OPPy/GE/Au electrode exhibits much stronger electroactivity for...
With the data growth related to the increase of devices with network access, the high speed Ethernet is widely used in various fields from big data center to high frequency transaction (HFT). However, the conventional software-based protocol stack consumes large amount of CPU time at full transmission rate, and leads to low performance such as high latency and low throughput. This paper presents a...
Reconfigurable solid state drive platform is necessary for the evaluation of emerging non-volatile memories. In this paper, we design a solid state drive prototyping system based on Xilinx Zynq chip, and further implement a ReRAM-based solid state drive system. ATTO Disk Benchmark is used to test the potential performance benefit of ReRAM-based storage. The superior random write performance demonstrates...
Because of the electrical asymmetry, the traditional five-contact vertical Hall devices have large inherent offset. This paper presents a low-offset vertical Hall device with a couple of three-contact vertical Hall elements. Due to the good electrical symmetry of this new vertical Hall device, the inherent offset is significantly lower than that of a five-contact vertical Hall device. The simulation...
A single photon avalanche diode (SPAD) device with deep P-well is proposed, which is protected by surrounding P-implantation layer, P buried layer and P+ buried layer. The P+ buried layer of this SPAD device has great help to enhance the uniformity of electric field in avalanche multiplication region. The primary contribution of the P buried layer is to improve the electric field at the edge. Therefore,...
This paper presents a prioritized LRU (least recently used) cache replacement circuit that directly accomplish the prioritized operation inside the cache circuits, which significantly reduces cache access latency. The performance, hardware and power overheads due to incorporating prioritized operations in cache circuits are investigated based on a 65nm CMOS technology. It shows the design of prioritized...
This paper presents that the RC polyphase filter has characteristics as a complex analog Hilbert filter. Phase characteristics of the RC polyphase filter have the same as the Hilbert filter. Also its gain characteristics can be approximated as the Hilbert filter; as its order becomes higher, its gain characteristics become closer to the Hilbert filter. We have proved these for 1st to 4th RC polyphase...
This paper creatively presents a sigma-delta digital to analog converter (ΣΔDAC) which achieves 88.5 dB signal to noise and distortion ratio (SNDR) in the 200 KHz bandwidth. The proposed modulator with a high pass dither block can eliminate harmonic spurs without increasing the noise floor in band. In addition, a 2nd-order vector feedback dynamic element match (VFBDEM) provides a good harmonic suppression...
In this work, two-dimensional MoS2 has been performed for nonvolatile memory application as charge storage layer. The capacitance-voltage (C-V) hysteresis and programming characteristics of MoS2-NVMs with blocking oxide layer of various thicknesses have been further investigated. The MoS2-NVMs with 9-nm-thck blocking oxide layer exhibits a large hysteresis in the C-V sweeping and the fastest speed...
The current field-effect transistors use nickel-based silicides for contacting the source and drain regions. The thickness of this silicide is trending to ever-thinner values. The influence of this thickness decrease on the formation of nickel silicides was systematically investigated between 0 and 15 nm. Annealing thickness gradients enabled us to distinguish two regimes: films above a critical thickness...
This work reviews a process that was developed to enhance the interface state density of a Ge/High-k interface. A slot plane antenna plasma oxidation (SPAO) process was implemented during dielectric deposition steps to fabricate TiN/ZrO2/Al2O3/p-Ge MOS gate stacks. A poor interface was observed with SPAO being performed before Al2O3/ZrO2 gate stack deposition because of fragmented GeOX interfacial...
We have investigated the performance of the mono-layer MoS2 tunnel FET (TFET) through quantum transport simulations based on density functional theory (DFT). Two kinds of source/drain metal contact configurations namely the seamless contact and side contact are compared. It was found that ideal band bending control by seamless contact yields much better performance than the side contact, although...
This paper presents a radio frequency front end of 5.8GHz dedicated short range communication receiver, utilizing a low-IF heterodyne architecture, which is necessary to solve the image problem and I/Q mismatches. A LC tank that is used as load of LNA can tune the resonant frequency more accurately than specific process allows. A simple but effective voltage bias for the first RF mixer is proposed,...
The photocurrent in graphene has drawn much attention in recent years. The mechanisms of its production vary in different situations, such as at the interfaces of monolayer-bilayer junction or p-n junction. Here we demonstrate photocurrent generation in graphene-based field-effect transistors (GFETs) with a partially suspended area. Both Raman and photocurrent mapping were performed after a laser-induced...
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