Download Analog-Digital Converters for Industrial Applications by Frank Ohnhäuser PDF

By Frank Ohnhäuser

This ebook deals scholars and people new to the subject of analog-to-digital converters (ADCs) a vast creation, earlier than going into info of the state of the art layout concepts for SAR and DS converters, together with the newest examine subject matters, that are invaluable for IC layout engineers in addition to clients of ADCs in purposes. The e-book then addresses very important themes, similar to right connectivity of ADCs in an program, the verification, characterization and checking out of ADCs that be sure fine quality finish products.

Analog-to-digital converters are the primary point in any information processing process and law loops reminiscent of modems or electric motor drives. They considerably have an effect on the functionality and determination of a method or finish product. procedure improvement engineers have to be accustomed to the functionality parameters of the converters and comprehend the benefits and drawbacks of some of the architectures. built-in circuit improvement engineers need to conquer the matter of accomplishing excessive functionality and backbone with the bottom attainable energy dissipation, whereas the electronic circuitry generates distortion in provide, flooring and substrate. This publication explains the connections and provides feedback for acquiring the top attainable answer. Novel tendencies are illustrated within the layout of analog-to-digital converters according to successive approximation and the problems within the improvement of continuous-time delta-sigma modulators also are discussed.

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A17-a20, April 2008. Chapter 2 ADCs Based on Successive Approximation Chapter 1 discusses the various performance parameters and architectures of ADCs. The SAR ADC is presented as the ADC that is most frequently used in industrial applications, because it provides a high resolution (12–18 bit) at a medium sample rate (around 1 MSPS). This chapter therefore presents design and architectural basics and details regarding the components of a SAR ADC [1]. The principle block diagram is shown again in Fig.

The selected device will latch the data on the interface to the addressed register on the rising edge of WR. The parallel interface can quickly transfer data and is commonly used for fast converters or for converters with a high channel count. As a disadvantage, three synchronization lines, 16 data lines and optional address lines are required. The routing on the PCB is area consuming and ICs with parallel interface need a high pin count. Therefore, data is often transferred sequentially. They are known as serial port interface (SPI).

At least two currents to the motor have to be measured. The third current can be calculated, but needs to be monitored for failure. The currents are transferred into AC motor I-sense AC supply I-sense I-sense DC link sense Digital control circuit Position sense of load Angular motor position sense Fig. 3 ADCs Used in Industrial Applications 39 the rotating coordinates of the motor, so that the angular motor position needs to be sensed. This is required for the control of the torque. More accurate systems also measure the position of a load.

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