Read e-book online Analog Circuit Design: Structured Mixed-Mode Design, PDF

By Michiel Steyaert (Editor), Arthur H.M. van Roermund (Editor), Johan H. Huijsing (Editor)

ISBN-10: 0306479516

ISBN-13: 9780306479519

ISBN-10: 1402072163

ISBN-13: 9781402072161

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Read Online or Download Analog Circuit Design: Structured Mixed-Mode Design, Multi-Bit Sigma-Delta Converters, Short Range RF Circuits PDF

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Extra info for Analog Circuit Design: Structured Mixed-Mode Design, Multi-Bit Sigma-Delta Converters, Short Range RF Circuits

Sample text

Therefore, it is better to also limit the gm values of the slaves to integer multiples of the master gm. Another possibility is to have constant different gm values and to tune the deviations only by changing the capacitance values (capacitor tuning). However, for area-limited solutions (and area is cost for integrated solutions), constant-gm approaches are not optimal [6]. 5 that other gm values have to be found than the ones generated by the DR optimization or that the optimization has to be made discrete which is a difficult problem.

This means that to obtain a good feasible result, some designer interaction is required. Two kinds of interaction are necessary: changing the weights of the cost function and changing the bounds of the parameters. Feedback of both is graphically presented to the designer. Typically the solution is then found iteratively using small population sizes and few iterations. 1 Example An example of automatic transconductor sizing is given to illustrate the methods described above. 5V supply voltage. The goal is to obtain a transconductor that can be used in the example filter described previously.

Also maximum distortion specifications for the transconductors are known, as well as their minimal output impedance for an acceptable transfer function deviation. The next step then is to actually design the transconductors in the filter. The number of possible transconductor circuits is huge and many have been presented in literature. It is not the intention of this text to elaborate on the design of a good transconductor. However, to enable further computer-aided filter design, an in-house tool is described that automates to a certain extent the transconductor design.

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Analog Circuit Design: Structured Mixed-Mode Design, Multi-Bit Sigma-Delta Converters, Short Range RF Circuits by Michiel Steyaert (Editor), Arthur H.M. van Roermund (Editor), Johan H. Huijsing (Editor)


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