By Alonso Morgado, Rocío del Río, Visit Amazon's José M. de la Rosa Page, search results, Learn about Author Central, José M. de la Rosa,
This e-book offers cutting edge options for the implementation of Sigma-Delta Modulation (SDM) established Analog-to-Digital Conversion (ADC), required for the following new release of instant hand held terminals. those units might be according to the so-called multi-standard transceiver chipsets, built-in in nanometer CMOS applied sciences. essentially the most tough and important elements in such transceivers is the analog-digital interface, due to the diversified sign bandwidths and dynamic levels that may be required to deal with the A/D conversion for a number of operation modes.
This publication describes new adaptive and reconfigurable SDM ADC topologies, circuit recommendations and synthesis equipment, particularly fitted to multi-standard instant telecom structures and destiny Software-defined-radios (SDRs) built-in in nanoscale CMOS. it's a sensible e-book, going from easy innovations to the frontiers of SDM architectures and circuit implementations, that are defined in a didactical and systematic approach. It supplies a entire evaluate of the state of the art functionality, demanding situations and sensible strategies, offering the mandatory perception to enforce profitable layout, via an effective layout and synthesis technique. Readers will research a few useful abilities – from system-level layout to experimental measurements and testing.
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This booklet provides cutting edge options for the implementation of Sigma-Delta Modulation (SDM) dependent Analog-to-Digital Conversion (ADC), required for the following iteration of instant hand held terminals. those units should be in keeping with the so-called multi-standard transceiver chipsets, built-in in nanometer CMOS applied sciences.
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Additional resources for Nanometer CMOS Sigma-Delta Modulators for Software Defined Radio
19) • Effective number of bits, ENOB. 20) where the ENOB represents the number of bits needed for an ideal Nyquist ADC to achieve the same DR as the converter. M does not increase monotonously for • Overload level, X OL . The SNR of a input amplitudes in the range [0, X FS /2], where X FS stands for the quantizer full scale. In practice, the embedded quantizer overloads for large amplitudes close to X FS /2, causing an increase in the in-band error and a sharp drop in the SNR. The maximum value of the SNR before that drop defines the peak SNR and the corresponding input level is defined as the overload level X OL of the M.
First, as illustrated in Fig. 3a, since f s is larger than the Nyquist rate, the images of the input created by the sampling process are more separated than in a Nyquist ADC. Spectral components of the input signal in the range [BW, f s − BW] do not alias within the signal band and, consequently, the transition band of the AAF can be smoother in an oversampling ADC, what greatly simplifies its design. Second, as illustrated in Fig. 3b, when an 28 2 ADCs: Basic Concepts, Topologies and State of the Art oversampled signal is quantized, the quantization noise is uniformly distributed in the range [− f s /2, + f s /2] and only a fraction of the total power lays within the signal band.
The architecture in Fig. 15b that includes distributed feedback and feed-forward paths can be used if a certain degree of freedom is desired in designing both NTF and STF. In this topology, the zeros of STF can be fixed with coefficients bi without affecting the pole placement. Local resonator feedbacks can be also included to set notches in |NTF(f )|. 4 Single-Loop Architectures 41 160 140 L=6 L=5 L=4 L=3 L=2 SNR (dB) 120 100 80 NTF with zeros at z = 1 60 ideal NTF 40 20 16 32 64 a 128 256 512 1024 OSR 160 140 L=6 L=5 L=4 L=3 L=2 SNR (dB) 120 100 80 NTF with optimal zeros 60 ideal NTF 40 20 16 b 32 64 128 256 512 1024 OSR Fig.
Nanometer CMOS Sigma-Delta Modulators for Software Defined Radio by Alonso Morgado, Rocío del Río, Visit Amazon's José M. de la Rosa Page, search results, Learn about Author Central, José M. de la Rosa,