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一种改进的适用于Sigma-Delta ADC的数字抽取滤波器
Sigma-delta模数转换器 滤波器 差分器
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2010/5/5
数字滤波器在sigma-delta ADC芯片中占据了大部分芯片面积，该文提出了一种数字滤波器结构，这种结构滤波器采用一个控制单元和一个加法器取代了Hogenauer结构滤波器中差分器的多个加法器，从而减小数字电路的面积。一个采用这种结构的4阶的数字滤波器在CYCLONE II FPGA芯片中被实现，耗费的硬件资源比Hogenauer结构的滤波器减少近29%。
Sigma-Delta Voltage to Frequency Converter With Phase Modulation Possibility
Sigma-Delta Voltage Frequency Converter Phase Modulation Possibility
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2009/7/28
Voltage to frequency converter (VFC) is an oscillator whose frequency is linearly proportional to control voltage. There are two common VFC architectures: the current steering multivibrator and the ch...
Effects of Double Delta Doping on Millimeter and Sub-millimeter Wave Response of Two-Dimensional Hot Electrons in GaAs Nanostructures
Carrier mobility Delta doping Hot carriers Quantum wells
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2010/2/2
Carrier mobility has become the most important
characteristic of high speed low dimensional devices. Due to
development of very fast switching semiconductor devices, speed of
computer and communica...
A New Approach to Design Low Power Continues-Time Sigma-Delta Modulators
Sigma-delta modulator Current-mode Nonlinear Transconductance
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2010/2/2
This paper presents the design of a low power
second-order continuous-time sigma-delta modulator for low power
applications. The loop filter of this modulator has been implemented
based on the nonl...
Delta算子系统的鲁棒D稳定可靠控制
线性矩阵不等式 Delta算子系统 执行器故障
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2013/4/25
研究具有执行器故障的Delta算子线性不确定系统鲁棒D-稳定可靠控制问题,即设计控制器,消除系统不确定性和执行器故障的影响,确保闭环系统极点落在复平面指定圆盘区域内。考虑执行器故障为连续故障模型的情形,利用线性矩阵不等式(linear matrix inequality,LMI)方法,给出Delta算子系统状态反馈鲁棒D-稳定可靠控制器存在的充分条件,并由此提出相应控制器设计方法。利用所得结论,给...
Enhanced Electrical Properties of p-type GaN by Mg Delta Doping
Mg-delta-doping p-type GaN hole mobility hole concentration
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2010/7/16
The Mg-delta-doped GaN structure was grown by low-pressure metalorganic chemical vapor deposition (LP-MOCVD). The Hall-effect measurements revealed that the electrical properties were enhanced. A twof...
Negative Differential Resistance Behavior in Delta-Doped AlInP Structure Grown by MOCVD
Delta-doped Resonant interband tunneling (RIT)
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2010/12/7
An AlInP delta-doped schottky diode exhibiting negative differential resistance (NDR) behavior is demonstrated for the first time. The NDR characteristics with a peak to valley ratio of 5.5 and peak c...