By Robert H.M. van Veldhoven
ISBN-10: 940070643X
ISBN-13: 9789400706439
Sigma Delta converters are a truly renowned selection for the A/D converter in multi-standard, cellular and mobile receivers. Key A/D converter standards are excessive dynamic variety, robustness, scalability, low-power and coffee EMI. Robust Sigma Delta Converters presents a demand derivation of a Sigma Delta modulator utilized in a receiver for mobile and connectivity, and indicates trade-offs among RF and ADC. The e-book proposes to categorize those specifications in five caliber symptoms which are used to qualify a method, specifically accuracy, robustness, flexibility, potency and emission. within the booklet those caliber symptoms are used to categorize Sigma Delta converter concept. a number of highlights on each one of those caliber symptoms are;
- Quality symptoms: supply a way to quantify procedure quality.
- Accuracy: advent of recent Sigma Delta Modulator architectures.
- Robustness: an important extension on clock jitter concept in line with section and blunder amplitude blunders versions. Extension of the speculation describing aliasing in Sigma Delta converters for various different types of DACs within the suggestions loop.
- Flexibility: creation of a Sigma Delta converter bandwidth scaling thought resulting in very versatile Sigma Delta converters.
- Efficiency: advent of latest Figure-of-Merits which greater mirror performance-power trade-offs.
- Emission: research of Sigma Delta modulators on emission isn't really a part of the book
The caliber symptoms additionally demonstrate that, to take advantage of these days complex IC applied sciences, issues may be performed up to attainable electronic as much as a restrict the place procedure optimization permits decreasing process margins. on the finish of the publication Sigma Delta converter implementations are proven that are digitized on application-, architecture-, circuit- and layout-level.
Robust Sigma Delta Converters is written lower than the belief that the reader has a few history in receivers and in A/D conversion.
Read or Download Robust Sigma Delta Converters: And Their Application in Low-Power Highly-Digitized Flexible Receivers PDF
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Extra resources for Robust Sigma Delta Converters: And Their Application in Low-Power Highly-Digitized Flexible Receivers
Example text
Therefore, it is advantageous to increase the digitization of a system as digital circuits score high on the quality indicators. 4. 5: Digitization of an analog system at different levels will be carried through four different abstraction levels, displayed in Fig. 5. At system level, this calls for an early introduction of the A/D and D/A conversion in the system pipe-line, which shifts the signal processing as much as possible into the digital domain. Once in the digital domain, the systems’ accuracy is only determined by the accuracy described in the VHDL code when operating within the maximum achievable speed of the technology and within the noise margin.
This reduces the portability of these analog blocks and thus increases time-to-market. Next to that, analog circuits are much more difficult to make reconfigurable. Therefore, it is advantageous to increase the digitization of a system as digital circuits score high on the quality indicators. 4. 5: Digitization of an analog system at different levels will be carried through four different abstraction levels, displayed in Fig. 5. At system level, this calls for an early introduction of the A/D and D/A conversion in the system pipe-line, which shifts the signal processing as much as possible into the digital domain.
40 Chapter 4. 5 Hz) and corresponding thermal noise limits Another system partitioning parameter is the choice of the 1/f-thermal noise corner compared to the signal bandwidth. 5) In Fig. 5 f and 2 Hz. 5–5 Hz. On the same y-axis the total noise Ntot normalized to Sth is displayed. 1. IF Choice 41 above Beff is 99% of B (B = 1 Hz). 65 Hz. 35 times. 99 Hz (grey line). The more fc is lowered below the IF, the less it helps to lower the total integrated noise, and the more dominant the thermal noise becomes, which is a likely scenario for the more wide-band (MHz range) systems, like WLAN.