By Kathleen Philips, Arthur H. M. van Roermund (auth.)

ISBN-10: 1402046790

ISBN-13: 9781402046797

ISBN-10: 1402046804

ISBN-13: 9781402046803

1.1 heritage Moore’s legislations predicts a lessen by way of an element of 2 within the characteristic measurement of CMOS te- nology each 3 years and has been legitimate for years. It implies a doubling of the - eration pace and a 4 instances greater transistor count number according to unit of quarter, each 3 years. the mix ends up in an 8 occasions better processing power in step with unit of region. This on-going miniaturization permits the mixing of advanced digital platforms with hundreds of thousands of transistors (Very-Large-Scale-Integration) and allows the mixing of el- tronic structures. An digital approach A popular photograph of an built-in digital process is proven in ?g. 1.1. the center of the process is the sign processing middle. This middle helps a large choice of features, similar to customization and programmability of a number of functions, channel coding, the de?nition of the person interface, and so on. those features are enabled through DSP, a controller CPU and numerous blocks of reminiscence. In complex ICs those blocks supply (almost) all sign processing and typically dominate within the total energy and quarter intake of built-in platforms. the massive facts premiums concerned, require high-speed busses for verbal exchange among those blocks. A power-management unit fuels the method through supplying the - propriate provide voltages and currents.

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The second bullet is important for a comparison with Nyquist A/D converters. The overall feedback relaxes various accuracy requirements on analog sub-blocks. Finally, the previous, rather intuitive reasonings are supported by a survey of published power/performance of A/D converters. 1 The Shannon theorem and based signal conditioning The Shannon theorem considers the data rate through a channel. e. on an electrical signal. This signal -just as the Shannon channel- is characterized by a bandwidth and a SNR.

Next, the stateof-the-art in converter design is briefly discussed. This discussion includes some architectural choices and circuit aspects of a design. It provides a common ground for use in later chapters. In addition, it is motivated that a single-bit, continuous-time implementation of a ADC with a feed forward type of loop filter, is an inherently lowpower topology. Considering the discussion in chapter 2, this type of ADC has the prospect of becoming an enabling block in future conditioning channels.

3 Power consumption in analog conditioning circuits A relation between current consumption on one hand and thermal noise, intermodulation distortion and signal bandwidth on the other hand is mandatory for a basic analysis of the channel (see chapter 1). This relation is first derived for the analog conditioning circuits. Analog signal conditioning includes amplifying the signal, reducing the signal bandwidth and dynamic range. Hence, filters and amplifiers (having a fixed or a variable gain) are the main building blocks.

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ΣΔ A/D CONVERSION FOR SIGNAL CONDITIONING by Kathleen Philips, Arthur H. M. van Roermund (auth.)

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