Abstract
The continuing trend towards lower supply voltages has increased interest in the application of companding1 techniques [2, 8, 29, 31, 74-78]. This chapter discusses the design principles that are fundamental to the realisation of companding signal processors. In Section 2.1, an abstract approach is pursued to describe the general principle of distortionless companding. At a less abstract level, Sections 2.2 and 2.3 are geared toward the inherent companding characteristics of TransLinear (TL) and Voltage-TransLinear (VTL) circuits, respectively.
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Companding is a combination of compressing and expanding.
The exact definitions of the dynamic range and the signal-to-noise ratio used throughout this book are formulated in Section 6.1.
In principle, other first-order dynamic transfer functions, such as a differentiator, can be used here just as well. The choice of an integrator complies with the general application of the integrator as the basic building block for filters [80, 81].
In principle, paired matching of the saturation currents is a sufficient condition.
Proportional-To-Absolute-Temperature
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© 1999 Springer Science+Business Media New York
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Mulder, J., Serdijn, W.A., van der Woerd, A.C., van Roermund, A.H.M. (1999). Design principles. In: Dynamic Translinear and Log-Domain Circuits. The Springer International Series in Engineering and Computer Science, vol 481. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-4955-0_2
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DOI: https://doi.org/10.1007/978-1-4615-4955-0_2
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4613-7249-3
Online ISBN: 978-1-4615-4955-0
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