By Hendrik van der Ploeg
In glossy structures sign processing is played within the electronic area. opposite to analog circuits, electronic sign processing bargains extra robustness, programmability, blunders correction and garage probability. the fashion to shift the A/D converter in the direction of the enter of the process calls for A/D converters with extra dynamic variety and better sampling speeds. This places severe calls for at the A/D converter and almost certainly raises the ability intake.
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Additional resources for Calibration Techniques In Nyquist A/D Converters
The number of folds is called the folding factor Ff . 10 shows one folding signal with a folding factor of 8. 10. Nevertheless, between the transitions there is a linear region. 10: Folding of input signal ’ generated, of which only the linear’ part is used for conversion. 11 shows two parallel folding signals of which only the linear parts are applied to comparators. 11) each. This can be expanded to 8 folding signals with one detection level each. However, generating these folding signals requires the same amount of hardware as a full ﬂash converter, since each zero-crossing is generated by one differential pair.
15: Coarse levels determine the DAC subtraction levels to generate the residue signal Before the ﬁne quantization is done, the residue signal is ampliﬁed by the residue ampliﬁer to reduce the accuracy requirements in the ﬁne A/D converter. Since the coarse and the ﬁne quantization do not take place at the same time, the use of a sample-and-hold ampliﬁer (SHA) is obligatory. 16. 16: Two-step A/D converter architecture converter. This therefore requires twice the settling time with respect to the ﬂash and folding and interpolating architecture, although the settling requirements during coarse conversion are relaxed with respect to the settling during ﬁne conversion, as will be explained later.
22: Total intrinsic capacitance of a SHA in a two-step A/D con- verter as a function of the number of bits (N), with NEF = 4 The two-step architecture provides a large reduction in intrinsic capacitance compared to the ﬂash architecture. However, to make a proper conversion, it is very important in a two-step structure that the ﬁne range ﬁts exactly in a coarse range. In this derivation above it is assumed that the circuitry that provides this guarantee has a negligible contribution to the intrinsic capacitance.
Calibration Techniques In Nyquist A/D Converters by Hendrik van der Ploeg