By Kathleen Philips
SigmaDelta A/D Conversion for sign Conditioning addresses the appliance of continuous-time SigmaDelta A/D converters in receivers for a.o. instant conversation. particularly, it specializes in their resources for digitizing such channels.
The e-book supplies an outline of the state of the art in SigmaDelta layout and of the demanding situations for destiny realizations. It offers an figuring out of the elemental strength potency of SigmaDelta converters. furthermore, it offers an research of the facility intake within the decimation filter out. knowing those power/performance trade-offs, it turns into transparent that straight-forward digitization of a conditioning channel, i.e. changing analog for electronic conditioning, comes at a huge energy penalty.
This booklet proposes another imaginative and prescient on digitization: as a result of its inherent immunity to interferers, a part of the sign conditioning could be built-in into the continuous-time SigmaDelta A/D converter. This method ends up in an important development of the power/performance stability of the complete channel. some of the features of the interferer immunity of the converter are analyzed in a lot aspect and enhanced SigmaDelta topologies with even greater immunity are provided. layout examples for hugely digitized AM/FM and Bluetooth radios function a demonstration. The examples contain specified circuit diagrams, simulation and try out effects, in addition to an review of the SigmaDelta-based conditioning channel compared to extra traditional solutions.
The ebook is key analyzing for mixed-signal and RF designers who are looking to familiarize with the fundamentals of SigmaDelta layout. For the skilled clothier and for the process architect, the booklet offers an in-depth figuring out of the main resources of SigmaDelta converters in digitized receivers.
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Extra resources for Sigma Delta A/D Conversion for Signal Conditioning
The choice of the over-sampling factor has a strong impact on the SQNR. Next to appearing explicitly in eq. 1, also L is a function of m. This is discussed below. Loop ﬁlter The architectural design of the loop ﬁlter includes the choice of the ﬁlter order, the choice between a switched capacitor or a continuous-time implementation and the choice of ﬁlter topology. 3: Continuous-time ADC with feed forward (a) and feedback (b) loop ﬁlter • the higher-order ﬁlter sections provide additional shaping of the quantization noise; • still, the power consumption of these sections can be very low: since the ﬁlter is put inside of an overall feedback loop, the noise and distortion of these stages is suppressed by the gain of the preceding sections.
The key assumption in the analysis is that the load of the circuit behaves capacitively over a large part of the signal bandwidth. Hence, this condition is fulﬁlled for the α = 2/3 case in the analysis above because the dominant pole of the open loop transfer function is much smaller than the signal bandwidth. A further assumption in the referenced paper is the fact that the output swing is rail/rail. Thus, for a ﬁxed gain, VD D can be substituted by vˆIN . The above-derived expression for the current consumption (eq.
1: Overview of ADCs as listed in appendix A repeated for ADCs only. 1 of appendix A and comprises around 70 designs published from 2000 until 2004. The resulting chart of ﬁg. 1 proves that, also for ADCs, the FOM of eq. 6 closely predicts the power/bandwidth versus SINAD trendline. In , this anomaly between the theoretical prediction (∼ 22ENOB ) and the practical trendline (∼ 2ENOB ) is attributed to technology constraints, architectural overhead and various implementation related limitations.
Sigma Delta A/D Conversion for Signal Conditioning by Kathleen Philips