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The incorporation of new materials into CMOS scaling has become a necessity. Our previous work in SiGe and III-V integration shows promise in allowing further materials integration for increased transistor density. However, a principal concern is that investment returns by further increasing transistor density will likely be negative for all but possibly one or two corporations, and may be negative...
This paper presents an ultra wide band CMOS common source low noise amplifier using the current-reuse and transformer-feedback technique. Implementation of a voltage-voltage feedback enables the neutralization of the miller capacitance and the achievement of flat gain at high frequency. The simulation results show that the peak gain is 14.07dB, and that input and output return losses were less than...
This paper presents a new current-mode universal filter with two-input two-output using only one fully differential current conveyor, two grounded capacitors and two grounded resistors. The use of grounded passive components makes the proposed structure highly for integrated circuit implementation. The proposed filter provides low-pass, band-pass, high-pass, band-stop and all-pass current responses...
An ultra-low-voltage low phase noise LC-VCO IC has been demonstrated using 180-nm CMOS technology. The LC-VCO IC includes a cross-coupled pMOSFET pair, a symmetric three-port spiral inductor, MOS varactors and buffer amplifiers. The LC-VCO IC is designed, fabricated and fully tested on wafer. The VCO IC exhibits a phase noise of −118.9 dBc/Hz at 1 MHz offset from the 2.29 GHz carrier at a supply voltage...
This paper suggests a three stage voltage controlled oscillator designed using 0.18μm CMOS process with maximum oscillation frequency up to 4.7GHz. Suggested VCO have high tuning range, linear frequency voltage characteristics, low power consumption and have low phase noise. A tail current improvement technique is applied to reduce the discharging time. Oscillation frequency varies from 4.7GHz–0.500GHz...
High power photodiodes were proposed in prior works for conversion of broadband modulated optical signals to electrical signals for transmission at high frequencies. At moderate to high optical powers, the linearity of the photodiode becomes a main concern for achieving high linearity transmission in fiber link. In this invited talk the mode analysis for understanding the absorption profile of high...
Micromachined terahertz metamaterial with polarization insensitive switching for both inductive-capacitive and dipolar resonances is experimentally demonstrated. Eight microcantilevers placed at each corner of an octagon ring provides the desired rotational symmetry and out-of-plane actuated electrostatic microcantilevers preserve symmetry at different metamaterial configurations. The switching range...
In this study, the internal impedances of different dye-sensitized solar cell (DSSC) model were analyzed by electrochemical impedance spectrometer (EIS) with an equivalent circuit model. The Nyquist plot was built to simulate the redox reaction of internal device at the hetero-junction. It was useful to analyze the component structure and promote photovoltaic conversion efficiency of DSSC. The impedance...
Free-space beam steering plays an important role in ultrafast switching and scanning applications. This paper proposes an alternative method to realize two-dimensional large-angle beam steering for single wavelength light on silicon photonics platform. The steerer consists of an electrically controlled I×N cascaded add-drop ring resonator and N off-chip coupler arrays. Each output of the resonator...
This work is to calculate the dc characteristics and investigate the internal quantum efficiencies of β-FeSi2-based DH LED and AlGaAs/GaAs DH LED by analytical methods. The internal quantum efficiencies are decreased as the applied forward-bias voltages are increased. When the intrinsic layer thicknesses and doping concentrations are increased, the internal quantum efficiencies will also increase...
An integrated high efficiency tri-mode DC-DC converter that can operate in buck, boost and buck-boost configurations is presented. A power transmission gate is implemented in the tri-mode converter as the high side driver of the H-bridge output stage to extend the range of the output voltage to be lower than 1.5 V. The converter also incorporates segmented power output stages with dedicated top level...
The paper presents a simple fast-transient-response buck converter that is based on adaptive-hysteresis-controlled techniques. The advantages of the proposed converter are fast transient response, simple system design, small chip area and no requirement of slope compensation. The traditional voltage-mode controlled buck converter has a slower transient response. To solve this problem, the proposed...
In this paper, a novel design scheme has been proposed to reduce output ripple of a Dickson charge pump with build-in capacitors. While a linear regulator is used to regulate the pump output to 15 V, an auxiliary transistor is utilized to improve the narrowband amplifier. It has also been proved that this design is effective to improve the system stability, and to serve as a soft-start circuit naturally...
In this paper, two feedback schemes, pulse skip mode and linear mode, have been analyzed in build-in-capacitor Dickson charge pumps for moderate current drivability. It is proved that the linear mode regulator has its speed constraint in high-frequency operations, where the pulse skip mode one wins. This paper takes Dickson charge pump with less than 400 μA load as an example. When a simple pulse...
This paper proposes a space vector modulation based dc-link capacitor voltage balancing technique for a 5-level multiple-pole multilevel diode-clamped (M2DCI) inverter. The new 5-level inverter contains lesser number of clamping diodes compared to the conventional 5-level diode-clamped inverter (DCI) topology and does not require any extra balancing circuits to maintain balanced voltages across the...
This paper discusses a kind of novel steep-slope switch device, named as multi-finger Schottky-Barrier TFET (MFSB-TFET), with hybrid adaptive operation mechanism, for higher on current, steeper slope as well as low off current. With the on state dominated by Schottky injection current, transition region dominated by band-to-band tunneling and the off current greatly suppressed with increased effective...
Tactile sensors for measuring elastic properties of soft tissues have been previously implemented using large piezoelectric elements. However, due to limited sensitivity and spatial resolution inherent to the large form factor, their applications are limited. In this work, we report a miniaturized ring-shaped resonant tactile sensor for material elasticity measurement. The sensor, which is based on...
The drift rate is change of voltage by time dependence, that is isothermal and fixed composition in the solution. In this study, we prepared arrayed flexible chlorine ion sensors which are fabricated by radio frequency sputtering technology and screen-printed technology to measure the drift in the different NaCl solutions, we obtained output voltage in variation concentrations from 10−5M to 1 M NaCl...
With the percentage of embedded SRAM increasing in SoC chip, low-power design such as near-threshold SRAM technique is getting more and more attention to reduce entire chip energy consumption. However, the descending operating voltage will lead to longer write latency and higher failure rate. In this work, we present near-threshold SRAM design in which transient negative bit-line is employed as periphery...
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