The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents a novel approach that avoids unnecessary frame buffer accesses by exploring reusable frame buffer data for MPEG-4 simple profile video decoders. In an MPEG decoder, each decoded macroblock is stored in the frame buffer for future reference and video display. If a newly decoded macroblock overwrites the predecessor that is exactly the same, then the old data stored in the frame...
This paper discusses a family of fixed-frequency pulse-width-modulation based sliding mode voltage controllers for basic DC-DC converters operating in continuous conduction mode. An experimental comparison is offered between the proposed controller and the PWM peak current mode controller for the case of the boost converter. The performances and properties of the proposed controller, the conventional...
This paper proposes a data-selective affine projection algorithm. The algorithm generalizes the ideas of the conventional set-membership affine-projection (SM-AP) algorithm to include a variable data-reuse factor. By utilizing the information provided by the data-dependent step size, we propose an assignment rule that automatically adjust the number of data reuses. A particular reduced-complexity...
This paper presents exact analysis of class DE amplifier for any conditions including outside optimum conditions. We give an analytical expression of waveform equations and initial values of current and voltage in the steady state. By using these analytical equations, switching voltage, output voltage and power conversion efficiency of class DE amplifier can be derived with few efforts. In this paper,...
An analysis is given for sub-optimum conditions of class E amplifier with a nonlinear shunt capacitance with a grading coefficient of 0.5 at any duty cycle. By exploiting sub-optimum class E operation, various amplifier parameters such as input voltage, operating frequency, output power, and load resistance can be set as design specifications. An example of a design procedure of the class E amplifier...
This paper provides a survey of recent approaches for semantic content analysis using multiple modalities, such as video, audio, and on-screen text. It also introduces new methods for shot (GoP) level rate allocation for content-adaptive multimedia streaming in order to achieve the best user utility given relevance-distortion policy and available average channel bandwidth of a user. Some examples...
In this paper, we study the problem of video transcoding from MPEG-2 to WMV format, together with several desired functionalities such as bit rate reduction etc. We propose two architectures (for different typical application scenarios) that are unique in their complexity scalability and adaptive drifting error control, which in return provide a mechanism to achieve desired trade-off between the complexity...
In this paper, a new method is proposed to determine the optimal allocation of FACTS (flexible AC transmission system) devices. The method makes use of two-layered tabu search that evaluates integer and continuous variables. The emergence of the power market makes power system operators consider how to maximize the transmission capability. In this paper, UPFC of FACTS is employed to control power...
Accurate analog models of power system components are required in order to realize an analog computation engine for power systems. Analog computation is an area of continued interest and has certain advantages over traditional digital computation. Among the advantages are physically realizable solutions and significantly faster computation times. This paper focuses on the development of an algebraic...
This paper presents the design of a digitally post-corrected open-loop front-end track-and-hold circuit for a pipelined ADC. An open-loop architecture has been selected to achieve high-speed and low power-consumption. Clock-boosting, resistive source-degeneration and cross-coupling are used to reduce low-order harmonic distortion. To further reduce distortion components in the open-loop circuit, a...
This paper presents the measurement results for an analog to digital converter (ADC), which is targeted to operate especially in a video encoding system. It is designed to convert the dc coefficients of a current-mode discrete cosine transform into digital form. The converter is able to change its quantization factor adaptively, fulfilling the demands of several video compression standards. The maximum...
In this paper, a novel architecture for the implementation of serial parallel multipliers (SPM) is proposed. The proposed multiplier is based on a segmentation technique of a simple SPM to blocks of equal bit length. This multiplier achieves higher throughput because it requires small number of zeros to start a new multiplication cycle at a moderate hardware expense and achieves significant hardware...
An active inductor based bandpass radio-frequency (RF) filter circuit topology is presented that achieves a wide tuning range. Based on the proposed structure, a prototype 2th-order filter is designed, simulated, and laid out in a 0.18mum CMOS process. The center frequency of the filter can be tuned from 880MHz to 3.72GHz. The quality factor of the filter can also be tuned. The filter, including the...
Using various layout techniques and circuit configurations, the effects of matching on a log-domain filter were analyzed. It is shown here that one of three possible Tau cell configurations to implement the same 2nd order low pass filter clearly outperforms the others. Furthermore, application of a common centroid layout technique has had no noticeable improvement on filter matching
This paper proposes a novel approach to L2-sensitivity minimization problem of state-space digital filters subject to L2 -scaling constraints. The proposed approach reduces the constrained optimization problem to an unconstrained optimization problem by appropriate variable transformation. As a result, iterative algorithms for the L2-sensitivity minimization without L2-scaling constraints can be applied...
A design methodology for analog circuit blocks is proposed which combines circuit knowledge and high-level general-purpose math packages with CAD simulation tools. The proposed flow of the design of a complex analog or mixed-signal system starts with a conceptual phase setting performance goals for each block, Followed by an exploration phase based on analytical descriptions resulting in the selection...
A comparator with the use of a dynamic-biasing preamplifier is presented in this paper. The dynamic-biasing technique provides the flexibility to control and minimize the current consumption of the preamplifier, thereby optimizing the power consumption of the comparator. With the dynamic-biasing preamplifier, the comparator can also operate at lower supply voltage compared to that using conventional...
The goal of this paper is to present a transistor optimization methodology for analog integrated CMOS circuits, based on the physics-based gm/ID characteristics provided by the ACM compact MOS model. This methodology is implemented in a design tool, exploiting all the design space with the use of simulated annealing optimization process. A single technology dependent curve and accurate expressions...
A single bit 5th order complex continuous-time sigma-delta IF-to-baseband modulator with integrated mixer and switched-capacitor (SC) feedback DAC for AM/FM/IBOC car radio receiver is presented. The input intermediate frequency (IF) is 10.7MHz and the sampling frequency is 41.7MHz. In AM mode (3kHz BW) the achieved dynamic range is 110dB. In FM mode (200 kHz BW) the achieved dynamic range is 90dB...
Many man made chemical substances are coming under the focus for environmental abuse and their impact on wild life and humans. A widely used alkylphenolethoxylates (APEs) surfactant was recently banned in Europe because scientists discovered that APE breakdown products are estrogenic and highly toxic to aquatic organisms. Nonylphenol is one such substance that has come under the focus as an environmental...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.