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Journal ArticleDOI

A systematic procedure for generation and design of parasitic insensitive SC biquads

TL;DR: In this paper, a systematic method is presented for the generation and design of stray-insensitive switched capacitor (SC) biquads, where the parasitic insensitivity conditions reported earlier in the literature are exploited leading to the general switching scheme that guarantees stray insensitivity.
Abstract: A systematic method is presented for the generation and design of stray-insensitive switched capacitor (SC) biquads. To this end, the parasitic insensitivity conditions reported earlier in the literature are exploited leading to the general switching scheme that guarantees stray insensitivity. This scheme, in turn, yields the general configuration for a parasitic insensitive SC biquad. Then, following a systematic and exhaustive procedure, 23 new general biquads are obtained, some of which allow canonic designs. The 5 biquads reported so far in the literature are also derived in the process. All networks are input/output compatible with each other and, therefore, can be easily interconnected. Design equations are provided for all the circuits. Possibilities of design improvement using the new biquads are also indicated.
Citations
More filters
Book
15 Mar 2010
TL;DR: In this paper, a design approach based on a MOSFET model valid for all operating regions, rather than the standard square-law model, is presented, with numerous design examples and exercises also included.
Abstract: Covering the essentials of analog circuit design, this book takes a unique design approach based on a MOSFET model valid for all operating regions, rather than the standard square-law model. Opening chapters focus on device modeling, integrated circuit technology, and layout, whilst later chapters go on to cover noise and mismatch, and analysis and design of the basic building blocks of analog circuits, such as current mirrors, voltage references, voltage amplifiers, and operational amplifiers. An introduction to continuous-time filters is also provided, as are the basic principles of sampled-data circuits, especially switched-capacitor circuits. The final chapter then reviews MOSFET models and describes techniques to extract design parameters. With numerous design examples and exercises also included, this is ideal for students taking analog CMOS design courses and also for circuit designers who need to shorten the design cycle.

99 citations

Journal ArticleDOI
TL;DR: In this article, a pole-sharing technique was used for implementing bandpass filter banks using the non-minimum-phase Lerner approximation without placing additional speed requirements on the operational amplifiers and without resorting to complicated clocking strategies; only a biphasic clock was used.
Abstract: A pole-sharing technique was used for implementing bandpass filter banks using the nonminimum-phase Lerner approximation without placing additional speed requirements on the operational amplifiers and without resorting to complicated clocking strategies; only a biphasic clock was used. Substantial hardware saving has been achieved. The filter synthesis is shown to be micropower-compatible and parasitic-insensitive; phase reversal was easily accommodated while retaining all desirable features. A uniformly and nonuniformly spaced filter bank for typical speech applications have been simulated with SWITCAP and three channels of the uniformly spaced filter bank have been constructed on a breadboard using discrete components. The results obtained agreed with design specifications, yielding a good approximation to linear phase in the passband and sharp attenuation in the stopband. Single-parameter and statistical multiparameter sensitivity analyses are presented. >

12 citations

Journal ArticleDOI
TL;DR: In this paper, a systematic approach to the design of stray-insensitive switched-capacitor (SC) circuits from active-RC or RLC prototypes employing a parasitic insensitive SC differential voltage-controlled current-source as a basic building block is attempted.
Abstract: A systematic approach to the design of stray-insensitive switched-capacitor (SC) circuits from active-RC or RLC prototypes employing a parasitic insensitive SC differential voltage-controlled current-source as a basic building block is attempted. Procedures for transforming active-RC and RLC circuits into stray-insensitive SC circuits are formulated and illustrated with typical examples. Restrictions on the pole-frequency and pole-Q of the SC biquad are derived so that it closely emulates the frequency response of the original active-RC biquad. the SC biquad and the ladder filter derived by the proposed procedures were simulated with discrete components and tested in the laboratory. Test results agree closely with the theoretical predictions.

4 citations

Proceedings ArticleDOI
23 May 1989
TL;DR: Introduces a systolic array architecture (SAA) to the design of switched capacitor (SC) filter circuits and methods of implementing parasitic insensitive syStolic SC filters are given.
Abstract: Introduces a systolic array architecture (SAA) to the design of switched capacitor (SC) filter circuits. Methods of implementing parasitic insensitive systolic SC filters are given. Practical design examples are considered. Simulation results using a circuit extraction program in a LSI/VLSI workstation for a second-order filter are given. >

2 citations

References
More filters
Journal ArticleDOI
TL;DR: In this article, two closely related, low-sensitivity, active switched capacitor fitter topologies are presented, which are immune to the various parasitic capacitances normally present in switched capacitor networks.
Abstract: Two closely related, low-sensitivity, active switched capacitor fitter topologies are presented. Each of these circuits comprises two operational amplifiers and at most nine capacitors. The topologies have been carefully constructed so that they are immune to the various parasitic capacitances normally present in switched capacitor networks. One filter topology is capable of realizing any stable biquadratic z-domain transfer function, while the second one is only slightly less than fully general. Most commonly used transfer functions can be realized with either topology and will require only seven capacitors. The choice between the two topologies will generally be made on the basis of total capacitance required, dynamic range behavior, and sensitivity. A complete set of synthesis equations is given for both circuits which cover both the general and all the important special cases of the biquadratic transfer function. Finally, several examples are given which illustrate the synthesis procedures and the versatility of the filter topologies.

278 citations

Journal ArticleDOI
01 Jan 1979
TL;DR: In this paper, the basic operation of switched-capacitor filters is reviewed, followed by a discussion of the properties of the various circuit building blocks in MOS technology, and a summary of several filter organizations which appear to be well suited to switch-capACitor implementation is presented.
Abstract: In the past several years, much progress has been made in bringing the economies of integrated-circuit technology to bear on the realization of voiceband frequency selective filters. This paper will review one approach to this problem, the use of switched-capacitor techniques. The paper emphasizes the practical aspects of switched-capacitor filter design under the constraints imposed by MOS integrated-circuit technology. The basic operation of switched-capacitor filters is reviewed, followed by a discussion of the properties of the various circuit building blocks in MOS technology. Finally, a summary of several filter organizations which appear to be well suited to switched-capacitor implementation is presented.

238 citations

Journal ArticleDOI
TL;DR: In this paper, a switched-capacitor filter is presented based on a pair of complementary integrators and has transfer functions independent of parasitic capacitances between any node and ground, and design equations are given for low-pass, bandpass, high-pass and notch biquads, as well as ladder simulation filters.
Abstract: New topologies for switched-capacitor filters are presented. The circuits are based on a pair of complementary integrators and have transfer functions independent of parasitic capacitances between any node and ground. Design equations are given for low-pass, bandpass, high-pass, and notch biquads, as well as ladder simulation filters. The ladder simulation filters are scaled for optimum dynamic range. Discrete prototypes of both cascade and ladder simulation filters are used to verify the theory.

188 citations

Journal ArticleDOI
TL;DR: In this article, the authors review the rapid progress in MOS analog circuit techniques over the past three years, and attempt to estimate the near-term attainable characteristics of MOS LSI circuits which incorporate both analog and digital functions.
Abstract: Reviews the rapid progress in MOS analog circuit techniques over the past three years, and attempts to estimate the near-term attainable characteristics of MOS LSI circuits which incorporate both analog and digital functions.

103 citations

Journal ArticleDOI
TL;DR: In this paper, the bilinear z-transform is used for the design of switched-capacitor bandpass filters using coupled-biquad structures and employing biquad circuits which are completely insensitive to stray capacitances between any node and ground.
Abstract: A method is presented for the design of switched-capacitor bandpass filters using the bilinear z -transform. The filters are realized in low-sensitivity coupled-biquad structures and employ biquad circuits which are completely insensitive to stray capacitances between any node and ground. Geometrically symmetric (both all-pole and finite-transmissionzeros) as well as general-parameter filters are treated.

100 citations