By Mikael Gustavsson
CMOS information Converters for Communications distinguishes itself from different facts converter books through emphasizing system-related elements of the layout and frequency-domain measures. It explains intimately easy methods to derive facts converter specifications for a given verbal exchange method (baseband, passband, and multi-carrier systems). The authors additionally assessment CMOS facts converter architectures and speak about their suitability for communications. the remainder of the e-book is devoted to high-performance CMOS facts converter structure and circuit layout. Pipelined ADCs, parallel ADCs with a stronger passive sampling strategy, and oversampling ADCs are the point of interest for ADC architectures, whereas current-steering DAC modeling and implementation are the point of interest for DAC architectures. the rules of the switched-current and the switched-capacitor innovations are reviewed and their functions to the most important sensible blocks akin to multiplying DACs and integrators are certain. The ebook outlines the layout of the fundamental development blocks akin to operational amplifiers, comparators, and reference turbines with emphasis at the useful elements. to function analog circuits at a discounted offer voltage, designated circuit ideas are wanted. Low-voltage innovations also are mentioned during this ebook.
CMOS info Converters for Communications can be utilized as a reference booklet via analog circuit designers to appreciate the information converter specifications for communique purposes. it could actually even be utilized by telecommunication procedure designers to appreciate the problems of convinced functionality specifications on facts converters. it's also a good source to arrange analog scholars for the hot demanding situations ahead.
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Extra info for CMOS Data Converter for Communications
In Sec. 4, we will discuss the duplexing methods. In Sec. 5, we will discuss multi-carrier systems and their impact on the PAR. In Sec. 6, we will apply the system-related constrains to deriving the minimum requirement on data converters for digital transmission while Sec. 7 is devoted to finding the optimum data converters for ADSL. Sec. 8 will address A/D converter requirements for wideband radio. In all discussions, we will concentrate on SNR without explicitly discussing distortions. The SNR should be treated as SNDR and the number of bits should be treated as the effective number of bits for data converters in this chapter.
Data Convener Requirements for Communications M. In Fig. 2-9, we show the gap vs. the error probability. It is seen that the gap is larger than 9 dB for a symbol error rate less than Coding can significantly reduce the gap to 3 to 5 dB. Some extremely powerful coding schemes such as Turbo codes or Concatenated codes can reduce this gap to 1 to 3 dB. 4 DUPLEXING METHOD Duplexing or multiplexing is referred to the exchange of information in both directions of a connect. Do not confuse duplexing with multiple access which is based on insulating signals used in different connections from each other in a wireless radio system.
44, no. 5, p. 940-4, Oct. 1995. 1 INTRODUCTION Data converters are crucial building blocks in modern communications systems where DSPs are extensively used. A D/A converter is usually needed at the transmit side and an A/D converter is usually needed at the receive side. The most critical criteria in choosing such data converters are that the data converters shall not degrade the SNR and that the data converters shall not introduce any spurs or distortions. Depending on the actual communication system, the data converter requirements vary dramatically.