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🏛️國立陽明交通大學機構典藏

Author: search.filters.author.Chang, THHas files: No

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Now showing 1 - 8 of 8
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    Simultaneous quality improvement of tunneling- and interpoly-oxides of nonvolatile memory devices by NH3 and N2O nitridation
    (2003-01-01)
    Chao, TS
    ;
    Chang, TH
    ;
    電子物理學系
    ;
    Department of Electrophysics
    In this paper, we found the nitridation on the interpoly-oxide with NH3 and N2O processes can simultaneously improve the quality of both tunneling oxide and interpoly-oxide. Three types of poly-Si for floating gate are investigated. We found in-situ doped poly -Si shows the best performance in terms of breakdown filed, charge to breakdown (Q(BD)) and trapping rate The Q(BD) of interpoly-oxide can be reached as high as 35 C/cm(2). This scheme is very promising for nonvolatile memory devices.
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    Dual-band sigma-delta modulator for wideband receiver applications
    (2004-02-01)
    Chiang, JS
    ;
    Chou, PC
    ;
    Chang, TH
    ;
    電控工程研究所
    ;
    Institute of Electrical and Control Engineering
    This work presents a new sigma-delta modulator (SDM) architecture for a wide bandwidth receiver. This architecture contains dualbandwidth for W-CDMA and GSM system applications. Low-distortion swing-suppressing SDM and interpolative SDM cascaded units are used together. Using the low-distortion swing-suppressing technique, the resolution can be improved even under non-linearity effects. The interpolative SDM extends the signal bandwidth and represses the high-band noise. The SDM used in the W-CDMA and GSM applications was designed and simulated using 0.25-mum 1P5M CMOS technology. The simulated peak SNDR of W-CDMA and GSM are 72/70 dB and 82/84 dB in Low-IF/Zero-IF standards.
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    Dynamic range improvement of multistage multibit Sigma Delta modulator for low oversampling ratios
    (2005-02-01)
    Chang, TH
    ;
    Dung, LR
    ;
    電控工程研究所
    ;
    Institute of Electrical and Control Engineering
    This paper presents an improved architecture of the multistage multibit sigma-delta modulators (EAMs) for wide-band applications. Our approach is based on two resonator topologies, high-Q cascade-of-resonator-with-feedforward (HQCRFF) and low-Q cascade-of-integrator-with-feedforward (LQCEFF). Because of in-band zeros introduced by internal loop filters, the proposed architecture enhances the suppression of the in-band quantization noise at a low OSR. The HQCRFF-based modulator with single-bit quantizer has two modes of operation, modulation and oscillation. When the HQCRFF-based modulator is operating in oscillation mode, the feedback path from the quantizer output to the input summing node is disabled and hence the modulator output is free of the quantization noise terms. Although operating in oscillation mode is not allowed for single-stage SigmaDeltaM, the oscillation of HQCRFF-based modulator can improve dynamic range (DR) of the multistage (MASH) SigmaDeltaM. The key to improving DR is to use HQCRFF-based modulator in the first stage and have the first stage oscillated. When the first stage oscillates, the coarse quantization noise vanishes and hence circuit nonidealities, such as finite op-amp gain and capacitor mismatching, do not cause leakage quantization noise problem. According to theoretical and numerical analysis, the proposed MASH architecture can inherently have wide DR without using additional calibration techniques.
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    A structural process toward a sustainable ITS deployment
    (2000)
    Mao, CK
    ;
    Chang, TH
    ;
    Hu, SR
    ;
    經營管理研究所
    ;
    Institute of Business and Management
    Intelligent Transportation Systems (ITS) are the enhanced and integrated systems that employed advanced information and communication technologies to the operations of existing transportation systems. To achieve the goals of ITS, an ITS framework that guides the development directions and deployment strategies is a crucial component. Herein, a structural process that formulates a conceptual framework has been proposed. This conceptual framework basically identifies the crucial areas needed for the successful deployment of ITS. Based on the framework, a bunch of short-term action plans has been formulated and conducted. Also, future deployment prospects for ITS and the corresponding deployment time schedule are provided. It is aimed to not only provide the minimum required intelligent transportation infrastructure for various transportation modes, but also preserve an endurable and livable environment for next generations.
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    Automatic Chinese unknown word extraction using small-corpus-based method
    (2003)
    Chang, TH
    ;
    Lee, CH
    ;
    資訊工程學系
    ;
    Department of Computer Science
    Chinese unknown word extraction is an important problem for Chinese language processing. There are troublesome difficulties in the problem. First, almost any Chinese character can either represent a word or be a part of other words. Secondly, there is no blank between Chinese words for identifying the boundaries. Although some approaches have been proposed, there are some drawbacks in these methods. In this paper, we present and develop a method to extract Chinese unknown words more efficiently and precisely. It retains efficiency and accuracy even though the size of document set is small for training. It can also extract the unknown words occur rarely. Based on these advantages, it is very practical for real applications.
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    Topic segmentation for short texts
    (2003)
    Chang, TH
    ;
    Lee, CH
    ;
    資訊工程學系
    ;
    Department of Computer Science
    Topic segmentation, which aims to find the boundaries between topic blocks in a text, is an important task for semantic analysis of texts. Although different solutions have been proposed for the task, many limitations and difficulties exist in the approaches. In particular most of the methods do not work well for such case as short texts, internet news and student's writings. In this paper, we focus on the short texts and present a method for topic segmentation. It can overcome the limitations in previous works. In preliminary experiments, the method show the accuracy of topic segmentation is increased effectively.
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    On improving dynamic range of wideband multistage Sigma Delta modulator using nonlinear oscillation
    (2005)
    Chang, TH
    ;
    Dung, LR
    ;
    Guo, JY
    ;
    電控工程研究所
    ;
    Institute of Electrical and Control Engineering
    This paper presents an improved architecture of the multistage (MASH) multibit sigma-delta modulators (Sigma Delta Ms). The architecture can be immune to circuit nonidealities over a large portion of input range when oversampling ratio (OSR) is low, and hence the dynamic range (DR) can be improved. Our approach is based on two resonator topologies, high-Q cascade-of-resonator-with-feedforward (HQCRFF) and low-Q cascade-of-integrator-with-feedforward (LQCIFF). The key to improving DR is to use HQCRFF-based single-bit structure in the first stage and have the first stage oscillated. When the first stage oscillates, the coarse quantization noise vanishes and hence circuit nonidealities, such as finite op-amp gain and capacitor mismatching, do not cause leakage quantization noise problem. In addition, because of the in-band zeros introduced by the resonators, the proposed architecture enhances the suppression of the in-band quantization noise for wideband applications. As the results of simulation, the proposed MASH architecture can inherently have wide DR without using additional calibration techniques.
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    Item type:Item,
    On reducing leakage quantization noise of multistage Sigma Delta modulator using nonlinear oscillation
    (2005)
    Chang, TH
    ;
    Dung, LR
    ;
    Guo, JY
    ;
    電控工程研究所
    ;
    Institute of Electrical and Control Engineering
    This paper presents an improved architecture of the multistage (MASH) multibit sigma-delta modulators (Sigma Delta Ms). The architecture can be immune to circuit nonidealities over a large portion of input range when oversampling ratio (OSR) is low, and hence the dynamic range (DR) can be improved. Our approach is based on two resonator topologies, high-Q cascade-of-resonator-with-feedforward (HQCRFF) and low-Q cascade-of-integrator-with-feedforward (LQCIFF). The key to improving DR is to use HQCRFF-based single-bit structure in the first stage and have the first stage oscillated. When the first stage oscillates, the coarse quantization noise vanishes and hence circuit nonidealities, such as finite op-amp gain and capacitor mismatching, do not cause leakage quantization noise problem. In addition, because of the in-band zeros introduced by the resonators, the proposed architecture enhances the suppression of the in-band quantization noise for wideband applications. As the results of simulation, the proposed MASH architecture can inherently have wide DR without using additional calibration techniques.