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1998 Midwest Symposium on Circuits and Systems (Cat. No. 98CB36268)最新文献

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A minimum variance single frequency estimator using recursive least squares estimate of noise statistics 使用递归最小二乘估计噪声统计量的最小方差单频估计器
1998 Midwest Symposium on Circuits and Systems (Cat. No. 98CB36268) Pub Date : 1998-08-09 DOI: 10.1109/MWSCAS.1998.759479
K. Barman, M. Arvind
{"title":"A minimum variance single frequency estimator using recursive least squares estimate of noise statistics","authors":"K. Barman, M. Arvind","doi":"10.1109/MWSCAS.1998.759479","DOIUrl":"https://doi.org/10.1109/MWSCAS.1998.759479","url":null,"abstract":"This paper proposes a new minimum variance unbiased estimator (MVUE) for finding the frequency of a complex tonal signal corrupted by possibly coloured noise. The procedure employs unwrapping the phase of the measured samples of the signal and computing a weight vector such that the estimator is an MVUE. It is shown that when the noise is white, the estimator achieves CRLB (Cramer-Rao Lower Bound) and its performance matches that of Kay's estimator. In cases where the colouring process is unknown, we propose simultaneous estimation of unknown frequency as well as the unknown autocorrelation matrix using a recursive least square update procedure.","PeriodicalId":338994,"journal":{"name":"1998 Midwest Symposium on Circuits and Systems (Cat. No. 98CB36268)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125147231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Synthesis of optimal current copiers for low-power/low-voltage switched-current circuits 低功率/低压开关电流电路最佳电流复印机的合成
1998 Midwest Symposium on Circuits and Systems (Cat. No. 98CB36268) Pub Date : 1998-08-09 DOI: 10.1109/MWSCAS.1998.759473
Jin-Sheng Wang, R. Huang, C. Wey
{"title":"Synthesis of optimal current copiers for low-power/low-voltage switched-current circuits","authors":"Jin-Sheng Wang, R. Huang, C. Wey","doi":"10.1109/MWSCAS.1998.759473","DOIUrl":"https://doi.org/10.1109/MWSCAS.1998.759473","url":null,"abstract":"This paper deals with the noise issue of current copiers. It introduces a structure function for a current copier to estimate its SNR (signal-to-noise ratio). Different copiers have different structure functions. A current copier with a higher structure function value has the larger SNR. This paper also defines the figure-of-merit (FOM), a performance measure, for various current copiers in terms of SNR, power dissipation, settling time, and the storage capacitance. Several current copiers are compared with their FOMs. Based on the desired FOM, this synthesis process provides the designers with the optimum transistor size and storage capacitor for the selected current copier.","PeriodicalId":338994,"journal":{"name":"1998 Midwest Symposium on Circuits and Systems (Cat. No. 98CB36268)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114663818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
OBE set estimates in classification problems 分类问题中的OBE集估计
1998 Midwest Symposium on Circuits and Systems (Cat. No. 98CB36268) Pub Date : 1998-08-09 DOI: 10.1109/MWSCAS.1998.759482
D. Joachim, J. Deller, G.I. Mandour
{"title":"OBE set estimates in classification problems","authors":"D. Joachim, J. Deller, G.I. Mandour","doi":"10.1109/MWSCAS.1998.759482","DOIUrl":"https://doi.org/10.1109/MWSCAS.1998.759482","url":null,"abstract":"This paper explores the use of alternative estimates arising from the feasibility set of an optimal bounded ellipsoid (OBE) algorithm. The central estimator is interpretable as a least squares result, but all others in the bounding set are consistent with the observations and error bounds as well. The purpose of the present paper is to focus attention on the set estimates in an effort to stimulate further research into their utility in applications. As an example, we suggest the use of set estimates in classification problems in which the classes can be represented by distinct linear-in-parameters models, or by related sets.","PeriodicalId":338994,"journal":{"name":"1998 Midwest Symposium on Circuits and Systems (Cat. No. 98CB36268)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116745465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Filters with monotonic amplitude-frequency response 具有单调幅频响应的滤波器
1998 Midwest Symposium on Circuits and Systems (Cat. No. 98CB36268) Pub Date : 1998-08-09 DOI: 10.1109/MWSCAS.1998.759524
I. Filanovsky
{"title":"Filters with monotonic amplitude-frequency response","authors":"I. Filanovsky","doi":"10.1109/MWSCAS.1998.759524","DOIUrl":"https://doi.org/10.1109/MWSCAS.1998.759524","url":null,"abstract":"The polynomial low-pass filters monotonic in the pass-band amplitude-frequency responses are proposed. The characteristics are intermediate between the Butterworth and Papoulis filters (with these two classes as limiting), and can be obtained starting from the filters of fifth order. The number of the intermediate characteristics increases with the filter order. Decreasing the pass-band flatness degree one can obtain additional attenuation in the stop-band.","PeriodicalId":338994,"journal":{"name":"1998 Midwest Symposium on Circuits and Systems (Cat. No. 98CB36268)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130448618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
A scheme for the KHN state variable filter to improve its high frequency performance 一种改善KHN状态变量滤波器高频性能的方案
1998 Midwest Symposium on Circuits and Systems (Cat. No. 98CB36268) Pub Date : 1998-08-09 DOI: 10.1109/MWSCAS.1998.759526
D. Baez-López, G. Espinosa, L.I.V. Jurez, F.M. Hernandez, G.O. Romero, J. M. Ramirez
{"title":"A scheme for the KHN state variable filter to improve its high frequency performance","authors":"D. Baez-López, G. Espinosa, L.I.V. Jurez, F.M. Hernandez, G.O. Romero, J. M. Ramirez","doi":"10.1109/MWSCAS.1998.759526","DOIUrl":"https://doi.org/10.1109/MWSCAS.1998.759526","url":null,"abstract":"The state variable filter, also known as the KHN filter, is well known for its low sensitivities to the passive elements. However, its sensitivities to the finite gain bandwidth product of the operational amplifiers limit its performance for high frequencies. This modification consists in providing a positive feedback in the summing amplifier. Simulation of the proposed scheme and a comparison of the results with the conventional KHN filter is presented.","PeriodicalId":338994,"journal":{"name":"1998 Midwest Symposium on Circuits and Systems (Cat. No. 98CB36268)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131902321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
A vertical successive-approximation A/D converter architecture for high-speed applications 用于高速应用的垂直逐次逼近A/D转换器架构
1998 Midwest Symposium on Circuits and Systems (Cat. No. 98CB36268) Pub Date : 1998-08-09 DOI: 10.1109/MWSCAS.1998.759550
N. Hamdy, H. Soliman, A. Eid
{"title":"A vertical successive-approximation A/D converter architecture for high-speed applications","authors":"N. Hamdy, H. Soliman, A. Eid","doi":"10.1109/MWSCAS.1998.759550","DOIUrl":"https://doi.org/10.1109/MWSCAS.1998.759550","url":null,"abstract":"A non-iterative successive approximation quantization technique that provides high throughput rates at low decision cost/bit is described. The MSBs are obtained in a flash-like architecture operating according to a unidirectional successive approximation algorithm. The LSBs are then generated by recycling the built-in flash-type quantizer. Resolution is extendable at minimum speed loss through cascading similar stages operating with pipeline timing.","PeriodicalId":338994,"journal":{"name":"1998 Midwest Symposium on Circuits and Systems (Cat. No. 98CB36268)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133144280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
A voice-band audio processor IC for CDMA applications 用于CDMA应用的语音频带音频处理器IC
1998 Midwest Symposium on Circuits and Systems (Cat. No. 98CB36268) Pub Date : 1998-08-09 DOI: 10.1109/MWSCAS.1998.759536
B. Bakkaloglu, B. Evans, D. G. Gata, J. Hellums, J. Higdon, J. Hochschild, G. Lin, J.M. Muza, Zhengwei Zhang
{"title":"A voice-band audio processor IC for CDMA applications","authors":"B. Bakkaloglu, B. Evans, D. G. Gata, J. Hellums, J. Higdon, J. Hochschild, G. Lin, J.M. Muza, Zhengwei Zhang","doi":"10.1109/MWSCAS.1998.759536","DOIUrl":"https://doi.org/10.1109/MWSCAS.1998.759536","url":null,"abstract":"A 2.7 V voice-band audio processor (VBAP/sup TM/) IC for CDMA wireless handsets as presented, The chip consists of transmit (uplink) and receive (downlink) audio channels and runs at a nominal current consumption of 9.1 mA. The transmit channel has two differential microphone inputs with external filtering and gain option for signal conditioning before a /spl Sigma//spl Delta/ ADC. The transmit channel pre-emphasis filter, receive channel filter, part of transmit gain, receive gain, receive volume control and sidetone gains are achieved by a single DSP core. The receive channel has a differential and a single-ended speaker interface which can deliver 35 mW and 10 mW to a 32 /spl Omega/ load respectively. The PCM encoding and decoding can be achieved in both linear and /spl mu/-law companded modes. Due to the PLL/clock recovery circuitry the 13-bit /spl Sigma//spl Delta/ voiceband codec is immune to system clock jitter up to 37%.","PeriodicalId":338994,"journal":{"name":"1998 Midwest Symposium on Circuits and Systems (Cat. No. 98CB36268)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123844494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Performance comparison of switched-current basic cells 开关电流基本电池的性能比较
1998 Midwest Symposium on Circuits and Systems (Cat. No. 98CB36268) Pub Date : 1998-08-09 DOI: 10.1109/MWSCAS.1998.759472
M. A. Garcia-Andrade, G. Espinosa, D. Baez-López
{"title":"Performance comparison of switched-current basic cells","authors":"M. A. Garcia-Andrade, G. Espinosa, D. Baez-López","doi":"10.1109/MWSCAS.1998.759472","DOIUrl":"https://doi.org/10.1109/MWSCAS.1998.759472","url":null,"abstract":"This paper presents a comparison among some of the basic switched-current cells that have been proposed since the early years of this technique. Although several methods to reduce errors have been proposed so far, we have found only five basic cells, which present better characteristics in terms of two figures of merit. The figures of merit are the total harmonic distortion and offset current.","PeriodicalId":338994,"journal":{"name":"1998 Midwest Symposium on Circuits and Systems (Cat. No. 98CB36268)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121992711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Noise in color digital images 彩色数字图像中的噪声
1998 Midwest Symposium on Circuits and Systems (Cat. No. 98CB36268) Pub Date : 1998-08-09 DOI: 10.1109/MWSCAS.1998.759516
D.B. Lopez, F.H. Mendoza, J. M. Ramirez
{"title":"Noise in color digital images","authors":"D.B. Lopez, F.H. Mendoza, J. M. Ramirez","doi":"10.1109/MWSCAS.1998.759516","DOIUrl":"https://doi.org/10.1109/MWSCAS.1998.759516","url":null,"abstract":"Noise is a fundamental problem in color image processing, whether analog or digital. This problem is more relevant in image restoration and enhancement because, depending on its application, we will frequently need to eliminate or add this noise, for this reason it is important to know its behavior. This work presents some common types of noise in digital images, their presence and behavior in color images.","PeriodicalId":338994,"journal":{"name":"1998 Midwest Symposium on Circuits and Systems (Cat. No. 98CB36268)","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122249148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
Simultaneous optimization of boundary filters and stationary filters for paraunitary FIR filter banks 准准FIR滤波器组的边界滤波器和平稳滤波器的同时优化
1998 Midwest Symposium on Circuits and Systems (Cat. No. 98CB36268) Pub Date : 1998-08-09 DOI: 10.1109/MWSCAS.1998.759528
W. Niehsen
{"title":"Simultaneous optimization of boundary filters and stationary filters for paraunitary FIR filter banks","authors":"W. Niehsen","doi":"10.1109/MWSCAS.1998.759528","DOIUrl":"https://doi.org/10.1109/MWSCAS.1998.759528","url":null,"abstract":"The optimization of two-band paraunitary finite impulse response (FIR) filter banks for finite-length signals is considered. Boundary filters which are optimal in a weighted mean square error (MSE) sense in the Fourier domain and the associated stationary filters are optimized simultaneously. Simulation results reveal that the maximally flat Daubechies filters are nearly optimal with respect to energy compaction performance.","PeriodicalId":338994,"journal":{"name":"1998 Midwest Symposium on Circuits and Systems (Cat. No. 98CB36268)","volume":"491 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115302232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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