A new feasible method for the design of stray-insensitive optimum switched capacitor networks (original) (raw)
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Two-port analysis of switched-capacitor networks using four-port equivalent circuits in the z-domain
IEEE Transactions on Circuits and Systems
In a preview publication by the authors it was shown how swhbed-capacitor (SC) networks can bc analyzed by using nodal charge qUatfons. The result was a description of SC networks as time-variant sampled-data networks which led to a four-port e4@valent circuit rep* sent&ion in tbe z-domain. In this paper, the four-port representation is expanded by considering six basic building blocks for the design of any general active or passive SC network. Witb the four-port equivalent circuit representatioq traditional two-port analysis took such as the transmision m&lx and two-port transfer functions, can be used conveniently. An SC-filter design example is given and the measured response is shown to coincide witb tbe response predicted by the theory.
Nonlinear Switched-Capacitor Networks - Basic Principles and Piecewise-Linear Design
Ieee Transactions on Circuits and Systems, 1985
MEMBER, IEEE, AND ADORACTON RUEDA Abs~ucr-The applicability of switched-capacitor .(SC) components to the design of nonlinear networks is extensively discussed in this paper. The main objective is to show that SC's can be efficiently used for designing nonlinear networks. Moreover, the design methods to be proposed here are fully compatible with general synthesis methods for nonlinear n-ports. Different circuit alternatives are given and their potentials are evaluated.
Nodal analysis of switched-capacitor networks
IEEE Transactions on Circuits and Systems, 1979
Networks Absstract-Switched-capacitor (SC) networks comprise capacitors interconnected by an array of perlodlcally operated switches. Such networks are particularly attractive in light of the high circuit density possible with MOS integrated circuit technology and hybrid integrated circuits using thin-film and silicon technology. The paper describes the analysis of SC networks by using nodal charge equations. It is showu that SC networks are time-variant sampled-data networks, which cau be viewed as taudeh connected four-ports in the r-domain. One pair of ports is viewed as a signal path corresponding to the even time slots, the other pair of ports as a path corresponding to the odd time slots of the periodically operated switches. In a subsequent publication the authors will show how four-port equivalent clrcults in the z-domain of six basic building blocks can be used for the description of any SC network. This method allows the direct use of traditional network analysis tools lie the transmissiou matrix for de,riving transfer functions. The method ultimately leads to a two-port analysis of SC networks in which conventional two-port theory can be applied.
Stray capacitance eliminating transformations for switched capacitor circuits
International Journal of Circuit Theory and Applications, 1983
Transformations are given that eliminate the influence of part or all of the stray capacitances to ground in a switched capacitor circuit, while leaving the transfer functions and, conditionally, their sensitivities to nominal capacitor ratios invariant. the transformations increase the number of operational amplifiers to the minimum that is required, as we prove, for stray capacitance insensitive circuits. the number of capacitors usually also increases, giving rise to constraint equations.
1994
A method is described for the extraction of capacitor values for switched capacitor (SC) networks which compensate for the effect of finite amplifier bandwidth in the design of SC networks using optimization. The finite bandwidths of the amplifier distort the response of the network from the required response. It is shown that by readjusting the poles and zeros of the transfer function, the required response can be accurately restored. The values of capacitances are extracted by running a number of parallel local optimizations, each starting from different random initial conditions, on a network of transputers. This method removes the possibility of an optimization being trapped in a local minimum and ensures the stability of the design network.
Elimination of parasitic capacitances in switched-capacitor circuits by circuit transformations
IEEE Transactions on Circuits and Systems, 1985
A general method is presented which allows one to eliminate all parasitic capacitances to ground in a switched-capacitor circuit. The circuit transformation is generated by transformations on the nodal admittance matrix which leaves the transfer function invariant. In almost all cases the minimal number of operational amplifiers required for stray capacitance insensitive circuits is obtained. A few examples illustrate the method and for one of them a sensitivity comparison between the original and the transformed switched-capacitor circuit is carried out.
Active and Passive Electronic Components, 1994
A chronological list of 440 references on switched capacitor (SC) networks from 1939 to May 1981 was published in this Journal by J. Vandewalle. In this communication, we present a compilation of 1357 references covering the period from May 1981-1992 (along with a supplementary list of 43 missing references for the period before May 1981). The present compilation and the earlier one by Vandewalle put together, thus, constitute an exhaustive bibliography of 1797 references on SC-networks and techniques till 1992.
Optimization methods for switched capacitor circuits
International Conference on Applied Electronics, 2015
The paper investigates the performance of the Differential Evolution (DE) and Particle Swarm Optimization (PSO) algorithm for SC filter Optimization. In order to improve their performance the three algorithm based on their combination are proposed. The performance is investigated on the design of switched capacitor biquadratic filters and the resulting performance and limitations are discussed.
Proceedings of The IEEE, 1987
This section is intended primarily for rapid dissemination of brief reports on new research results within the scope of the lEEE members. Contributions are reviewed immediately, and acceptance is determined by timeliness and importance of the subject, and brevity and clarity of the presentation. Research letters must contain a clear concise statement of the problem studied, identify new results, and make evident their utility, importance, or relevance to electrical engineering and science. Key references to related literature must be given.