The Experts below are selected from a list of 198 Experts worldwide ranked by ideXlab platform
S K Mitra - One of the best experts on this subject based on the ideXlab platform.
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transversal narrowband Switched Capacitor Filters
International Symposium on Circuits and Systems, 1997Co-Authors: Antonio Petraglia, S I Khalili, S K MitraAbstract:This paper considers the implementation of non-recursive Switched-Capacitor Filters realized in transversal form for narrowband signal processing applications. Effects of random capacitance errors and finite gain and bandwidth of the operational amplifiers in the filter frequency response are investigated. Computer simulations are presented to verify the main theoretical results.
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low passband sensitivity Switched Capacitor Filters using a parallel connection of two structurally lossless networks
International Journal of Circuit Theory and Applications, 1992Co-Authors: Claudealain Gobet, S K Mitra, Antonio PetragliaAbstract:The low-sensitivity property of IIR digital Filters designed using a parallel connection of two allpass sections has already been demonstrated in the past few years. This property is closely related to the use of a particular type of allpass structures, called structurally lossless networks, which remain allpass regardless of the coefficient quantization. In this paper we provide a general theory for the synthesis of low-passband-sensitivity Switched Capacitor (SC) Filters using a similar technique. the design of stray-insensitive structurally allpass SC sections is emphasized, ensuring the passivity property for the overall filter. Design examples are presented with computer simulations and experimental results to compare the performance of the different proposed structures. Analytical sensitivity calculations are also derived yielding useful formulae for the prediction of the filter sensitivities with respect to Capacitor ratios, particularly in the stopband.
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effects of coefficient inaccuracy in Switched Capacitor transversal Filters
IEEE Transactions on Circuits and Systems, 1991Co-Authors: Antonio Petraglia, S K MitraAbstract:Coefficient inaccuracy effects in the frequency response of finite-impulse-response (FIR) Switched-Capacitor Filters implemented in direct form are investigated. No assumption is made with respect to the filter coefficients, so that the results of the analysis are valid for both linear and nonlinear phase FIR Filters. Assuming that the errors in the Capacitor ratios realizing the tap coefficients are uncorrelated and have identical Gaussian distributions, an exact probability distribution function is derived for the error in the frequency response. It is shown that this distribution can be characterized by a Rayleigh distribution, which is then used to derive an upper bound for the expected stopband attenuation. Extensive simulation results are shown to support the analysis. >
A.k. Betts - One of the best experts on this subject based on the ideXlab platform.
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a continuously variable tuning technique for Switched Capacitor Filters
IEEE Transactions on Circuits and Systems I-regular Papers, 1996Co-Authors: H. Shafeeu, A.k. Betts, J TaylorAbstract:A new tuning technique for SC Filters is described which allows separate, continuous tuning of centre frequency and Q. Feedforward control is used with this arrangement and so the complexities and hence cost of feedback control are largely avoided. Measured results from a discrete component model are provided.
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An improved tuning technique for Switched Capacitor Filters
Proceedings of IEEE International Symposium on Circuits and Systems - ISCAS '94, 1994Co-Authors: H. Shafeeu, A.k. Betts, J.t. TaylorAbstract:A new technique is described for tuning SC circuits that provides wide-ranging, continuous tuning of any circuit parameter that is determined by a Capacitor ratio. The technique employs voltage scaling circuits to modify effective Capacitor ratios. Although based on the master-slave control principle, these strategies are considerably more economical than other widely used master-slave tuning methods as they do not require duplication of a substantial part of the main filter.
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Evaluation and synthesis of ultra narrow band Switched-Capacitor-Filters employing multirate techniques
IEEE International Symposium on Circuits and Systems, 1Co-Authors: A.k. Betts, John TaylorAbstract:The problem of designing ultra-narrowband Switched-Capacitor Filters (relative bandwidth >
Antonio Liscidini - One of the best experts on this subject based on the ideXlab platform.
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a third order integrated passive Switched Capacitor filter obtained with a continuous time design approach
IEEE Transactions on Circuits and Systems I-regular Papers, 2019Co-Authors: Sevil Zeynep Lulec, D A Johns, Antonio LiscidiniAbstract:A third-order passive Switched-Capacitor low-pass filter is presented together with experimental results. The current input-voltage output filter structure realizes complex-conjugate poles although it is composed of switches and Capacitors. The results are verified with measurements performed on the filter prototype integrated in a 0.13- $\mu \text{m}$ CMOS technology. The prototype has a cut-off frequency of 470 kHz, 150- $\mu \text{W}$ power consumption from 1.2-V power supply, 92-dB SFDR, and an active area of 0.06 mm2. The switch-Capacitor filter was obtained using a continuous-time model that is also described here and is useful for design, analysis, and simulation of oversampled Switched-Capacitor circuits. The model is applicable to a variety of topologies including multi-phase passive Switched-Capacitor Filters, Switched-Capacitor integrators, as well as Switched-Capacitor dc/dc converters.
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A Simplified Model for Passive-Switched-Capacitor Filters With Complex Poles
IEEE Transactions on Circuits and Systems II: Express Briefs, 2016Co-Authors: Sevil Zeynep Lulec, David A. Johns, Antonio LiscidiniAbstract:This brief demonstrates a method to realize complex conjugate poles using passive-Switched-Capacitor networks. In addition, a simplified continuous-time model will be introduced so that accurate transfer functions and output noise can be obtained without the need for complicated charge-balance equations and thereby allow a better intuitive understanding of these structures. The developed theory is demonstrated through the design of a second-order low-pass Butterworth biquad with applications intended in the design of wireless RF receivers.
John Taylor - One of the best experts on this subject based on the ideXlab platform.
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Evaluation and synthesis of ultra narrow band Switched-Capacitor-Filters employing multirate techniques
IEEE International Symposium on Circuits and Systems, 1Co-Authors: A.k. Betts, John TaylorAbstract:The problem of designing ultra-narrowband Switched-Capacitor Filters (relative bandwidth >
D Vazquez - One of the best experts on this subject based on the ideXlab platform.
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Improving the testability of Switched-Capacitor Filters
Analog Integrated Circuits and Signal Processing, 1993Co-Authors: J L Huertas, A Rueda, D VazquezAbstract:A design-for-test methodology for SC Filters is presented, based on an architecture using some additional circuitry and providing extra capabilities for both off- and on-line tests. The approach uses a comparison (voting) mechanism to indicate whether or not two copies of a filter element (a biquad, for instance) have a similar response during their actual operation. The design and implementation of a few filter examples are included to assess the potential usefulness of this new approach.
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testable Switched Capacitor Filters
IEEE Journal of Solid-state Circuits, 1993Co-Authors: J L Huertas, A Rueda, D VazquezAbstract:A design-for-testability (DFT) methodology for Switched-Capacitor (SC) Filters is presented, based on an architecture using some additional circuitry and providing extra capabilities for both off- and online test. A programmable biquad is used for on-chip comparison of the transfer functions for every filter stage. Test area overhead consists of the programmable biquad, a set of switches, and a finite-sequential-machine (FSM) control part. The design and implementation of an example filter are included to assess the potential usefulness of this approach. >
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on line testing of Switched Capacitor Filters
VLSI Test Symposium, 1992Co-Authors: J L Huertas, D Vazquez, A RuedaAbstract:Proposes a new solution to alleviate the area overhead when replication is used in Switched-Capacitor Filters. This new approach, although based on the voter mechanism, only requires a programmable biquad and some control logic as extra components (instead of the full duplication of the system). To some extent, it can be considered a first intent to apply information redundancy for the concurrent test of analog circuits. >
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Testable Switched-Capacitor Filters
ESSCIRC '92: Eighteenth European Solid-State Circuits conference, 1992Co-Authors: J L Huertas, A Rueda, D VazquezAbstract:A Design for Test methodology for S-C Filters is presented, based on an architecture using some additional circuitry and providing extra capabilities for both off-and on-line test. The approach uses a comparison mechanism to indicate whether or not two copies of a filter element (a biquad,for instance) have a similar response during their actual operation. The design and implementation of an integrated filter is included to assess the potential usefulness of this new approach.
