Browse Prior Art Database

Amplifying Device for Data Acquisition Systems

IP.com Disclosure Number: IPCOM000076574D
Original Publication Date: 1972-Mar-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Miche, JR: AUTHOR

Abstract

A large number of the measurements performed in data-acquisition systems generally requires only medium or low accuracy and resolution. Only certain particular measurements require a higher resolution, but without a very high accuracy, mainly for the measurement of low-relative variations around a given point. This resolution conditions the resolution of the whole acquisition chain. In acquisition systems with real-time processing, it is possible to discriminate the values requiring only a low resolution and the ones requiring a higher resolution and, therefore, to truncate the binary values to retain only the useful part before processing or recording.

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Amplifying Device for Data Acquisition Systems

A large number of the measurements performed in data-acquisition systems generally requires only medium or low accuracy and resolution. Only certain particular measurements require a higher resolution, but without a very high accuracy, mainly for the measurement of low-relative variations around a given point. This resolution conditions the resolution of the whole acquisition chain. In acquisition systems with real-time processing, it is possible to discriminate the values requiring only a low resolution and the ones requiring a higher resolution and, therefore, to truncate the binary values to retain only the useful part before processing or recording. But, for all that, all the elements of the acquisition chain located between the measurement sensors and the processing unit remain designed in function for the maximum resolution to be obtained.

Fig. 1 shows a device enabling the use of an acquisition chain of medium resolution (8 bits for example) with a real-time processing unit. Under normal conditions, this resolution is sufficient. When a particular condition appears and a higher resolution desired, to observe small variations around a given point, an amplifying device can be used. This device consists in subtracting the mean value corresponding to the medium point under examination from the input signal, in amplifying the difference with a programmable-gain amplifier (or auto- programmable gain amplifier), and...