James A. Cherry, W. Martin Snelgrove's Continuous-Time Delta-Sigma Modulators for High-Speed A/D PDF

By James A. Cherry, W. Martin Snelgrove

ISBN-10: 0306470527

ISBN-13: 9780306470523

ISBN-10: 0792386256

ISBN-13: 9780792386254

Among analog-to-digital converters, the delta-sigma modulator has cornered the marketplace on excessive to very excessive answer converters at reasonable speeds, with ordinary functions resembling electronic audio and instrumentation. curiosity has lately elevated in delta-sigma circuits equipped with a continuous-time loop clear out instead of the extra universal switched-capacitor strategy. Continuous-time delta-sigma modulators supply much less noisy digital flooring nodes on the enter, inherent security opposed to sign aliasing, and the capability to take advantage of a actual instead of an electric integrator within the first degree for novel purposes like accelerometers and magnetic flux sensors. extra considerably, they sit back settling time regulations in order that modulator clock charges could be raised. This opens the potential for wideband (1 MHz or extra) converters, in all probability to be used in radio functions at an intermediate frequency in order that a number of levels of combining should be performed within the electronic area.
Continuous-Time Delta-Sigma Modulators for High-Speed A/D Conversion: concept, perform and primary functionality Limits covers all facets of continuous-time delta-sigma modulator layout, with specific emphasis on layout for top clock speeds. The authors clarify the fitting layout of such modulators when it comes to the well-understood discrete-time modulator layout challenge and supply layout examples in Matlab. additionally they conceal commonly-encountered non-idealities in continuous-time modulators and the way they degrade functionality, plus a wealth of fabric at the major difficulties (feedback direction delays, clock jitter, and quantizer metastability) in very high-speed designs and the way to prevent them. additionally they provide a concrete layout process for a true high-speed circuit which illustrates the tradeoffs within the choice of key parameters. particular circuit diagrams, simulation effects and try out effects for an built-in continuous-time four GHz band-pass modulator for A/D conversion of one GHz analog indications also are offered.
Continuous-Time Delta-Sigma Modulators for High-Speed A/D Conversion: idea, perform and basic functionality Limits concludes with a few promising modulator architectures and an inventory of the demanding situations that stay during this interesting field.

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Extra info for Continuous-Time Delta-Sigma Modulators for High-Speed A/D Conversion: Theory, Practice and Fundamental Performance Limits

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5,1). 5 with their describing equations. 6. By diode-connecting the final differential pair rather than cross-coupling them [Gao98a], an RZ rather than an NRZ waveform is output. In the multi-feedback architecture, we can use any two of NRZ, RZ, and HRZ, or for that matter any other two different pulses, but those three types are easiest to build in a practical circuit. 15). 5. Common DAC pulse types. 6. ECL-style latched comparator with preamplification for enhanced resolution at high speed. For an NRZ comparator, connect the final differential pair via the dashed lines; for RZ, connect the dotted lines instead.

15. 16). Moreover, the coefficients of s³ and s ¹ are both proportional to k4 , a second undesirable trait. The issue is one of controllability: we have four numerator coefficients in B P (s) and fewer than four tunable parameters (we could play with each DAC current and numerator gain separately, but not in a combination to realize the needed transfer function). Early designs [Thu91] suffered from lack of controllability. One way to get four independent tunable parameters is to use resonators with a low pass term included in the numerator: (As + B) / (s² + ω ² ) .

5,1). 5 with their describing equations. 6. By diode-connecting the final differential pair rather than cross-coupling them [Gao98a], an RZ rather than an NRZ waveform is output. In the multi-feedback architecture, we can use any two of NRZ, RZ, and HRZ, or for that matter any other two different pulses, but those three types are easiest to build in a practical circuit. 15). 5. Common DAC pulse types. 6. ECL-style latched comparator with preamplification for enhanced resolution at high speed. For an NRZ comparator, connect the final differential pair via the dashed lines; for RZ, connect the dotted lines instead.

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Continuous-Time Delta-Sigma Modulators for High-Speed A/D Conversion: Theory, Practice and Fundamental Performance Limits by James A. Cherry, W. Martin Snelgrove


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