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2015 IEEE Dallas Circuits and Systems Conference (DCAS)最新文献

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Asynchronous SAR logic design using majority vote comparison for configurable SAR ADCs 异步SAR逻辑设计使用多数投票比较可配置的SAR adc
Pub Date : 2015-12-17 DOI: 10.1109/DCAS.2015.7356586
M. Ahmadi, W. Namgoong
A low-power configurable design for an asynchronous SAR ADC that is suitable for analog front-end of sensor ASICs is presented. The proposed architecture employs a majority vote based comparator capable of providing programmable noise performance. The proposed asynchronous digital logic determines the majority vote by employing two counters at the comparator differential output. Simulation result shows that the total number of votes in a 12-bit ADC can be reduced by 42% using a split-counter majority voter. Further reduction is possible by allocating the number of votes non-uniformly with more votes closer to LSB cycles. Simulation results show that the total number of votes can be reduced by 65% in a 12-bit ADC with the non-uniform vote allocation. When compared to a non-voting conventional 12-bit SAR ADC with the same overall performance, the comparator power is reduced by 46%.
提出了一种适用于传感器专用集成电路模拟前端的异步SAR ADC的低功耗可配置设计。所提出的架构采用基于多数投票的比较器,能够提供可编程的噪声性能。所提出的异步数字逻辑通过在比较器差分输出处使用两个计数器来确定多数投票。仿真结果表明,在12位ADC中使用分置计数多数投票人可以将投票总数减少42%。通过不均匀地分配选票数量,使更多的选票更接近LSB周期,可以进一步减少选票数量。仿真结果表明,在12位ADC中,采用非均匀投票分配可以减少65%的投票总数。与总体性能相同的非投票传统12位SAR ADC相比,比较器功耗降低了46%。
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引用次数: 0
Channelized front-ends for broadband signal processing with relaxed anti-aliasing filtering 用于宽带信号处理的信道化前端,具有宽松的抗混叠滤波
Pub Date : 2015-12-17 DOI: 10.1109/DCAS.2015.7356596
V. Singh, Wei-Gi Ho, R. Gharpurey
A digital post-processing approach for reducing the anti-aliasing requirement in a frequency-folding channelizer architecture is described. The channelizer decomposes a broadband spectrum into multiple sub-bands. A signal of bandwidth N/2fLO is downconverted into N paths that are clocked using rectangular, non-overlapping pulse waveforms at a fundamental frequency of fLO with a duty-cycle of 1/N. All portions of the input are aliased onto a baseband signal of bandwidth fLO/2, which is low-pass filtered and applied to N sub-ADCs with identical sampling clocks. Individual sub-bands are selected in the digital domain. Aliasing between sub-bands is also removed after digitization. This is used to reduce the order of the anti-aliasing filters in the analog signal paths, which can potentially reduce power and design complexity. It is shown that a filter-order of at least one is necessary in the analog-domain to apply digital post-processing. The approach is verified in simulation.
描述了一种数字后处理方法,用于降低频率折叠信道器结构中的抗混叠要求。信道器将宽带频谱分解成多个子频段。带宽为N/2fLO的信号被下转换成N条路径,这些路径使用矩形、无重叠的脉冲波形以fLO的基频进行时钟处理,占空比为1/N。输入的所有部分都混叠到带宽为fLO/2的基带信号上,该基带信号经过低通滤波并应用于具有相同采样时钟的N个子adc。在数字域中选择单个子带。数字化后,子带间的混叠也被消除。这用于降低模拟信号路径中抗混叠滤波器的阶数,从而潜在地降低功耗和设计复杂性。结果表明,要在模拟域中应用数字后处理,至少需要一个1阶的滤波器。仿真验证了该方法的有效性。
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引用次数: 2
Exponential pulse generator for a time domain reflectometer 用于时域反射计的指数脉冲发生器
Pub Date : 2015-12-17 DOI: 10.1109/DCAS.2015.7356583
Mikel Ash, R. Flake, T. R. Viswanathan
An exponential pulse generator for use in a Time-Domain Reflectometer is described. This pulse has the property that its leading edge does not suffer distortion while propagating in dispersive lossy transmission lines. It thus enables accurate measurement of time of flight of a single pulse reflected by an impedance-discontinuity in a faulty transmission line. The design of a precision pulse generator that enables the control of pulse-amplitude, pulse-rate and the time constant of its exponentially rising edge is described. A key feature of the design is a compensation scheme to eliminate the temperature variation arising from the reverse saturation current as well as the thermal voltage in the exponential v-i characteristics of a p-n junction used to generate the pulse. Here we present simulation results as well as a circuit using discrete components interconnected on a printed circuit board. Experimental results from a calibrated prototype show that a fault 100 meters away along a cable can be located with a precision of a fraction of a millimeter.
描述了一种用于时域反射计的指数脉冲发生器。该脉冲具有在色散损耗传输线中传播时前缘不失真的特性。因此,它能够精确测量故障传输线中由阻抗不连续反射的单个脉冲的飞行时间。介绍了一种精密脉冲发生器的设计,该脉冲发生器能够控制脉冲幅度、脉冲速率及其指数上升沿的时间常数。该设计的一个关键特征是补偿方案,以消除由反向饱和电流引起的温度变化,以及用于产生脉冲的pn结的指数v-i特性中的热电压。在这里,我们给出了仿真结果以及在印刷电路板上使用互连的离散元件的电路。经过校准的原型机的实验结果表明,沿着电缆100米远的故障可以以一毫米的几分之一的精度定位。
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引用次数: 1
GPU based implementation of a 64-channel polyphase channalizer 基于GPU的64通道多相信道器的实现
Pub Date : 2015-12-17 DOI: 10.1109/DCAS.2015.7356605
Amean Al-Safi, B. Bazuin
Polyphase filter bank channalizers are essential components in numerous communication systems involving signal separation and sample rate conversion. In this paper, a novel fully parallelized 64 channels polyphase channalizer has been implemented using general purposes graphic processing units (GPGPU). The implemented models have been compared with a corresponding serial implemented model. The comparison indicates that the parallel models provide a computation speed of 9-16 times faster than the serial one using Nvidia GeForce GT520M and Quadro 600 GPUs.
多相滤波器组信道器是许多涉及信号分离和采样率转换的通信系统中必不可少的部件。本文利用通用图形处理单元(GPGPU)实现了一种新型的全并行64通道多相信道器。将实现模型与相应的串行实现模型进行了比较。比较表明,使用Nvidia GeForce GT520M和Quadro 600 gpu的并行模型的计算速度比串行模型快9-16倍。
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引用次数: 1
Determination of transconductance-to-drain-current dependent flicker noise parameters 跨导-漏极电流相关闪烁噪声参数的测定
Pub Date : 2015-12-17 DOI: 10.1109/DCAS.2015.7356582
J. Ou
Previous studies have shown that the transconductance-to-drain-current ratio (gm/ID) based technique is useful for noise analysis and optimization of analog CMOS circuits. In this paper, we examine flicker noise closely and show that even though its slope (A) does not depend gm/ID parameters of a transistor, knowledge of gm/ID parameters is required in order to determine its slope accurately. We take a look at several scenarios that arise in practice, and generate a simple rule of thumb that simplifies the process of de-embedding the slope of flicker noise. Finally, we apply the results in the analysis of a micropower operational transconductance amplifier (OTA) and show that excellent agreement between simulation and analysis is achieved.
以往的研究表明,基于跨导漏极电流比(gm/ID)的技术有助于模拟CMOS电路的噪声分析和优化。在本文中,我们仔细研究了闪烁噪声,并表明即使它的斜率(A)不依赖于晶体管的gm/ID参数,但为了准确地确定其斜率,需要了解gm/ID参数。我们看一下在实践中出现的几个场景,并生成一个简单的经验法则,简化了去嵌入闪烁噪声斜率的过程。最后,我们将结果应用于一个微功率运算跨导放大器(OTA)的分析,结果表明仿真结果与分析结果非常吻合。
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引用次数: 0
A highly efficient and reliable electrowetting on dielectric device for point-of-care diagnostics 一种高效可靠的电介质电润湿装置,用于现场诊断
Pub Date : 2015-12-17 DOI: 10.1109/DCAS.2015.7356590
Yiyan Li, R. J. Baker, Dominic Raad
A highly efficient and reliable electrowetting on dielectric (EWOD) digital microfluidics (DMF) chip is proposed. An 8 μm parylene C layer is used as the dielectric material. Extra vapor-phase silane (VPS) is introduced into the chamber and acts as an aerosol primer to enhance the chemical adhesion to the parylene C surface. The EWOD chip can perform droplet dispensing, merging and splitting smoothly in an air ambient. Dual electrode dispensing mode (DEDM) and single electrode dispensing mode (SEDM) are tested to investigate the dispensing volume accuracy. Small deviations (0.0467 μL for DEDM and 0.0303 μL for SEDM) are observed for the dispensing. Droplets from 1.5 μL to 2.3 μL are tested for the minimum splitting voltage. Larger droplets require larger voltages to be split. The proposed EWOD chip is promising for future point-of-care clinical diagnostics.
提出了一种高效可靠的电介质电润湿数字微流控芯片(DMF)。采用8 μm的聚对二甲苯作为介质材料。额外的气相硅烷(VPS)被引入腔室,作为气溶胶底漆,以增强对聚对二甲苯表面的化学附着力。EWOD芯片可以在空气环境中平稳地进行液滴分配、合并和分裂。测试了双电极点胶模式(DEDM)和单电极点胶模式(SEDM)的点胶体积精度。结果表明,配胶误差较小(DEDM为0.0467 μL, SEDM为0.0303 μL)。测试了1.5 μL ~ 2.3 μL的液滴的最小劈裂电压。更大的液滴需要更大的电压来分裂。提议的EWOD芯片有望用于未来的即时临床诊断。
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引用次数: 3
Precise EWOD top plate positioning using inverse Preisach model based hysteresis compensation 基于逆Preisach模型的磁滞补偿的EWOD顶板精确定位
Pub Date : 2015-12-17 DOI: 10.1109/DCAS.2015.7356591
Yiyan Li, R. J. Baker
The displacement of an intelligent PZT (piezoelectric materials based on modified lead zirconate titanate) controlled EWOD (electrowetting on dielectric) top plate is modeled by inverse Preisach hysteresis algorithm. First, the PZT deflection model is created from an experimental displacement dataset. The real time output is predicted based on the previously stored weighting functions. Upon the desired output and the current input, the input voltage is compensated by a feedforward voltage which is derived from the model using a closest match method. The feedforward process and the model are stored in a PC. A portable high voltage DAC (digital-to-analog converter) is used to drive the PZT cantilever structure. The worst-case DNL of the high voltage DAC is 0.8125 mV. The tracking errors of a 0.067 Hz triangle wave input are less than 5 μm. Results show the inverse Preisach model is a good candidate for precise EWOD top plate displacement hysteresis compensation.
采用逆Preisach滞回算法对智能压电材料(基于改性锆钛酸铅的压电材料)控制电介质上电润湿顶板的位移进行了建模。首先,根据实验位移数据集建立PZT挠度模型。实时输出是基于先前存储的权重函数来预测的。在期望输出和电流输入的基础上,输入电压通过使用最接近匹配方法从模型中导出的前馈电压进行补偿。将前馈过程和模型存储在PC机中。采用便携式高压数模转换器(DAC)驱动压电陶瓷悬臂结构。高压DAC的最坏DNL为0.8125 mV。0.067 Hz三角波输入的跟踪误差小于5 μm。结果表明,逆Preisach模型是EWOD顶板位移滞后精确补偿的理想模型。
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引用次数: 1
A simulation method for design and optimization of RF power amplifiers with digital predistortion 一种数字预失真射频功率放大器设计与优化的仿真方法
Pub Date : 2015-12-17 DOI: 10.1109/DCAS.2015.7356593
Hari Chauhan, M. Onabajo, Martin McCormick, Vladimir Kvartenko, R. Coxe
Linearization techniques such as digital predistortion (DPD) are often employed to enhance the overall performance of power amplifiers (PAs). The specific performance requirements of a system typically depend on the application. For this reason, the implementation of a DPD technique after the fabrication of a PA can result in significant overhead cost. To ensure high performance with minimum cost prior to fabrication, it is beneficial to utilize a simulation method for design optimization of both the PA and the DPD. A simulation approach was developed to enable concurrent design optimizations of a PA along with its DPD algorithm using commercially available software. Simulation results obtained with a 10 W inverted Doherty power amplifier design and a DPD solution are presented to demonstrate the proposed approach.
线性化技术如数字预失真(DPD)常用于提高功率放大器(pa)的整体性能。系统的特定性能需求通常取决于应用程序。由于这个原因,在制造PA之后实现DPD技术可能会导致显著的间接成本。为了在制造前以最小的成本确保高性能,利用仿真方法对PA和DPD进行设计优化是有益的。开发了一种仿真方法,使用商用软件对PA及其DPD算法进行并发设计优化。最后给出了一个10w反向多尔蒂功率放大器设计和DPD解决方案的仿真结果。
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引用次数: 3
Novel dithering-based peak-to-average power ratio reduction system 一种新的基于抖动的峰均功率比降低系统
Pub Date : 2015-12-17 DOI: 10.1109/DCAS.2015.7356598
Eran Pisek, S. Abu-Surra, R. Taori
A novel technique for Peak-to-Average Power Ratio (PAPR) reduction based on dithering is presented. The dithering method consists of adding a pre-defined random noise pattern to the transmitter time-domain Orthogonal Frequency Division Multiplexing (OFDM) symbol. The noise addition is performed to reduce the high peaks of the time-domain OFDM symbol. For each OFDM symbol, there is a process of selecting the most appropriate pre-defined noise pattern which achieves the lowest PAPR. We show that with merely 0.25 dB power increase to the time-domain transmitter OFDM signal, we attain the same Error-Vector Magnitude (EVM) in the receiver in different modulation schemes, with over 2 dB reduction in PAPR. The dithering information is transferred between the transmitter and the receiver using the pilot bits, thereby avoiding capacity reduction.
提出了一种基于抖动的峰值平均功率比(PAPR)降低方法。抖动方法包括在发送器时域正交频分复用(OFDM)符号中添加预定义的随机噪声模式。加入噪声是为了降低时域OFDM符号的峰值。对于每个OFDM符号,都有一个选择最合适的预定义噪声模式以达到最低PAPR的过程。我们的研究表明,在不同的调制方案下,仅对时域发射机OFDM信号增加0.25 dB的功率,就可以在接收机中获得相同的误差矢量幅度(EVM), PAPR降低超过2 dB。抖动信息使用导频位在发送端和接收端之间传输,从而避免了容量减少。
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引用次数: 0
A low-power switched-capacitor passive sigma-delta modulator 一种低功率开关电容无源σ - δ调制器
Pub Date : 2015-12-17 DOI: 10.1109/DCAS.2015.7356584
Angsuman Roy, R. J. Baker
A passive 2nd-order sigma-delta modulator using switched-capacitor based filters was designed, fabricated, and tested. A novel 2nd-order single feedback path topology is used. All circuitry is optimized for low power operation through the use of minimum size MOSFETs, component reduction and topology choice. The modulator was fabricated in On Semiconductor's C5 500-nm process. The implementation achieves a typical SNDR of above 50 dB for tested frequencies of 10 Hz to 3 kHz and has a peak SNDR of 57.8 dB, which corresponds to an ENOB of 9.3 bits. With a 2.5 V supply, the power consumption of the sigma-delta modulator is 6.75 μW. The modulator achieves a FOM of 1.78 pJ/step.
设计、制作并测试了一种基于开关电容滤波器的无源二阶σ - δ调制器。采用了一种新颖的二阶单反馈路径拓扑。通过使用最小尺寸的mosfet、元件减少和拓扑选择,所有电路都针对低功耗操作进行了优化。该调制器采用安森美半导体的C5 500纳米工艺制造。该实现在10 Hz至3 kHz的测试频率下实现了典型的50 dB以上的SNDR,峰值SNDR为57.8 dB,对应于9.3位的ENOB。在2.5 V电源下,σ - δ调制器的功耗为6.75 μW。该调制器实现了1.78 pJ/步的FOM。
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引用次数: 6
期刊
2015 IEEE Dallas Circuits and Systems Conference (DCAS)
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