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W. K. Jenkins

Bio: W. K. Jenkins is an academic researcher. The author has contributed to research in topics: Switched capacitor & Network analysis. The author has an hindex of 1, co-authored 1 publications receiving 21 citations.

Papers
More filters
Journal ArticleDOI
TL;DR: A technique is presented for computer-aided analysis for a class of switched-capacitor circuits that can be partitioned into elementary subnetworks that incorporates features that are specifically needed in practical SC circuits in order to produce an efficient algorithm for machine computation.
Abstract: A technique is presented for computer-aided analysis for a class of switched-capacitor (SC) circuits that can be partitioned into elementary subnetworks. This new approach is distinctly different from other published techniques, because, rather than striving for complete generality, it incorporates features that are specifically needed in practical SC circuits in order to produce an efficient algorithm for machine computation. The analysis technique is formulated in the time and frequency domains and a user-oriented program (scAP) is described that implements this technique. In addition, sensitivity analysis is also formulated for this new approach.

21 citations


Cited by
More filters
Journal ArticleDOI
01 Aug 1983
TL;DR: In this paper, various formulation techniques for analyzing switched-capacitor circuits have been described and compared and an overview of computer-aided analysis techniques has been given.
Abstract: In this paper, various formulation techniques for analyzing switched-capacitor circuits have been described and compared. Some basic pcoperties of the time-, z-, and frequency-domain solutions have been presented. Analysis techniques for handling nonideal op-amps, switch resistances, and noise and distortion effects are discussed. Methods for sensitivity analysis have been briefly mentioned and, finally, an overview of computer-aided analysis techniques has been given.

88 citations

Journal ArticleDOI
TL;DR: Novel circuits, based on the N -path (or pseudo-N -path) configuration, are described for the design of narrow-band switched-capacitor (SC) bandpass filters, providing stable passband responses and low sensitivities to element-value variations even for extremely narrow relative bandwidths, where other design approaches fail.
Abstract: Novel circuits, based on the N -path (or pseudo- N -path) configuration, are described for the design of narrow-band switched-capacitor (SC) bandpass filters. For noncritical applications very simple and economical circuits, based on the simulation of passive or active RC circuits, can be used; for high-accuracy filtering tasks, more elaborate circuits (obtained from doubly terminated reactance ladders) are proposed. The resulting filters provide stable passband responses and low sensitivities to element-value variations even for extremely narrow relative bandwidths, where other design approaches fail.

80 citations

Journal ArticleDOI
TL;DR: In this article, the computational aspects of the analysis of switched-capacitor (SC) networks having ideal elements and an arbitrary number of phases are discussed and a summary of various analyses, available in the WATSCAD program, is presented as well.
Abstract: The computational aspects of the analysis of switched-capacitor (SC) networks having ideal elements and an arbitrary number of phases are discussed. In each phase, a special two-graph preprocessing step eliminates all switches and topologically compresses the resulting matrices to the minimum. Subsequently, a new solution method reduces the problem to the solution of the compressed system. in a single phase. The majority of steps are transferred into preprocessing and done only once. A summary of various analyses, available in the WATSCAD program, is presented as well.

62 citations

Journal ArticleDOI
TL;DR: In this paper, a method of analyzing switched-capacitor (SC) filters which incorporates a single-pole model of the operational amplifiers (op amp's) is presented.
Abstract: A method of analyzing switched-capacitor (SC) filters which incorporates a single-pole model of the operational amplifiers (op amp's) is presented. Closed-form algebraic expressions for filter transfer functions in the z -domain are obtained which are computationally more efficient than time-domain methods. The necessity for including a frequency dependent model of the op amp rather than the common finite gain model in doing a performance analysis, especially when considering stability, is emphasized. To illustrate the method of analysis, an analog integrator, an analog second-order bandpass filter, and their SC counterparts are considered. The s -domain performance of the analog \footnote[1]{circuits} is compared with the z -domain performance of the sampled-data configurations to show how the finite gain-bandwidth product (GB) of the op amp's affects the respective topologies. These comparisons show that the effects of switching rates and switching arrangements on filter performance are strongly dependent upon the GB product of the op amps. These comparisons also emphasize the fact that it is not sufficient to investigate the effect of the operational amplifiers on the performance of an analog filter to predict the performance of a SC filter derived from the analog configuration.

25 citations

Journal ArticleDOI
TL;DR: In this article, a novel approach for designing infinite impulse response (IIR) switched-capacitor filters, based on the optimum allocation of poles and zeros of a transfer function, implemented by a direct-form topology using finite-impulse response (FIR) cells as basic building blocks, is presented.
Abstract: A novel approach for designing infinite impulse response (IIR) switched-capacitor filters, based on the optimum allocation of poles and zeros of a transfer function, implemented by a direct-form topology using finite-impulse response (FIR) cells as basic building blocks is presented. As a consequence, low sensitivity with respect to capacitance ratio errors in both passband and stopband frequencies, low power consumption, and improved group delay response are achieved. Comparisons with classical IIR and linear-phase FIR filter designs are made. An illustrative design example including simulation and experimental results obtained with a prototype filter are provided.

15 citations