This paper describes two floating-gate programmable OTAs (FG-OTAs). The OTAs have a pFET input stage and employ current mirror topology. A floating-gate (FG) common-mode feedback (CMFB) circuit as well as a convention...
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This paper describes two floating-gate programmable OTAs (FG-OTAs). The OTAs have a pFET input stage and employ current mirror topology. A floating-gate (FG) common-mode feedback (CMFB) circuit as well as a conventional CMFB circuit is described for use with these OTAs. Their performance is compared. Expressions are derived for the differential and common-mode frequency response of the OTAs. Typical simulation and experimental results are shown for prototypes fabricated in a 0.5μm CMOS process available through MOSIS. The prototypes operate from a single 3.3V supply with typical bias currents in the 10-100 nA range. A second order Gm-C filter section was built from these OTAs and the experimental results are presented.
This paper describes the implementation of delay element using C 4 band-pass filter for subband analog tapped-delay adaptive filter, where implementation of larger group delay is required. Most analog delay elements h...
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This paper describes the implementation of delay element using C 4 band-pass filter for subband analog tapped-delay adaptive filter, where implementation of larger group delay is required. Most analog delay elements have been implemented with low-pass or all-pass filters. While they can easily achieve constant group delay within pass band, maximum group delay is severely restricted by the corner frequency because group delay is inversely proportional to the corner frequency. In this paper, we implemented a delay element with a Capacitively-Coupled Current Conveyer (C4) band-pass filter to produce larger group delay required for analog subband adaptive filter. Experimental results from circuits fabricated in 0.5μm CMOS technology through MOSIS are also presented.
In this paper, we suggest the method that uses compensated multiplicative parameter according to the local characteristic. Firstly we use a linear gain between original image and the halftone image to calculate the mu...
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ISBN:
(纸本)8955191197
In this paper, we suggest the method that uses compensated multiplicative parameter according to the local characteristic. Firstly we use a linear gain between original image and the halftone image to calculate the multiplicative parameters that minimize quantization error of flat region. We represent the edge region by compensating multiplicative parameters. The proposed method reduces quantization error that causes sharpening. The proposed method yields the halftone image which is similar to the original image and improved in quality.
In this paper we present a modified AdaBoost algorithm that can be used for dimensionality reduction in audio classification problems. The algorithm is modified to work as a feature selec.or for a four way classificat...
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In this paper we present a modified AdaBoost algorithm that can be used for dimensionality reduction in audio classification problems. The algorithm is modified to work as a feature selec.or for a four way classification problem. It is compared with Principal Component Analysis (PCA), which is a popular tool for reducing the dimensions of high-dimensional data without loosing significant scatter information. Both algorithms are applied to a four way audio classification problem and the results are presented.
The design methodology and the test results of a low-voltage differential charge pump structure for phase-locked loop (PLL) applications are presented. The structure is composed of two charge/disch.rge blocks, a repli...
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The design methodology and the test results of a low-voltage differential charge pump structure for phase-locked loop (PLL) applications are presented. The structure is composed of two charge/disch.rge blocks, a replica bias circuit, and a sampled data common-mode feedback (CMFB) block that adjusts the pump-up current for symmetrical differential outputs and a wider output voltage range. A prototype is fabricated using a 0.18 μm n-well CMOS technology to test the charge pump in a high performance PLL, running internally at 2.5 GHz with -123 dBc/Hz phase noise at 1 MHz frequency offset.
A switched-R-MOSFET-C filter with tunable corner frequency is described. The tunability is achieved by varying the clock duty cycle using an automatic tuning circuit. This tuning method does not involve a change in an...
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A switched-R-MOSFET-C filter with tunable corner frequency is described. The tunability is achieved by varying the clock duty cycle using an automatic tuning circuit. This tuning method does not involve a change in any gate voltage, and is therefore particularly suitable for low-voltage and high-linearity applications. The advantages of the proposed method are illustrated with the design and simulation of a high-Q biquad filter.
Distributed signcryption is specifically designed for distributing a signcrypted message to a designated group. As such, it can not be used in anonymous communication. Accordingly, the current study adds an anonymity ...
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Distributed signcryption is specifically designed for distributing a signcrypted message to a designated group. As such, it can not be used in anonymous communication. Accordingly, the current study adds an anonymity property to distributed signcryption that results in almost the same computational load as regards the modular arithmetic. Therefore, the new sch.me is more efficient than the expansion for anonymity in [8], and has potential applications in elec.ronic commerce.
In this paper, we study the validity of the separation principle for linear quadratic control of linear systems in the presence of control input saturation. Our result shows that the well-known separation principle fo...
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In this paper, we study the validity of the separation principle for linear quadratic control of linear systems in the presence of control input saturation. Our result shows that the well-known separation principle for linear systems fails to hold in this case.
We propose a quality of service (QoS) management framework and a packet sch.duling sch.me over a shared wireless link for heterogeneous classes of traffic. The QoS management framework is developed based on the charac...
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We propose a quality of service (QoS) management framework and a packet sch.duling sch.me over a shared wireless link for heterogeneous classes of traffic. The QoS management framework is developed based on the characterization of different QoS requirements of heterogeneous traffic classes. The framework comprises two subsequent packet sch.duling modules and load control modules. Based on the QoS management framework, we propose an effective packet sch.duling sch.me that accounts for the wireless channel, status of packet queues, the degree of QoS satisfaction, and fairness among sessions. Simulation results show that the proposed packet sch.duling sch.me provides better performance than the previously proposed sch.mes in light or moderate system load, and that it provides fair sharing of QoS degradation in overload.
We consider a wireless network of N nodes equipped with omnidirectional antennas, and we extend the capacity results of some previous works by finding bounds on the maximum achievable per-node end-to-end throughput, ...
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ISBN:
(纸本)1581138466
We consider a wireless network of N nodes equipped with omnidirectional antennas, and we extend the capacity results of some previous works by finding bounds on the maximum achievable per-node end-to-end throughput, λe, while using a general network model and a bounded propagation model. Specifically, we show that when the network domain has a fixed area, λe, is Θ(1/N) even when the mobility pattern of the nodes, the temporal variation of transmission powers, the source-destination pairs, and the possibly multi-path routes between them are optimally chosen. This result continues to hold even when the nodes are capable of maintaining multiple transmissions and/or receptions simultaneously, or when the communication bandwidth is partitioned into sub-channels of smaller bandwidth. We also address how λe depends on the other network parameters such as the area of the network domain, the path loss exponent, or the average number of hops between a source and a destination. Finally, we determine some required conditions to achieve a non-vanishing per-node end-to-end throughput as the number of nodes in the network grows large.
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