Browse Prior Art Database

Improvement On BCD Analog to Digital Converter

IP.com Disclosure Number: IPCOM000098263D
Original Publication Date: 1960-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Wortzman, D: AUTHOR

Abstract

Code conversion devices in analog-to-digital converters has been reduced by a more logical choice of codes used with the A to D converter

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Improvement On BCD Analog to Digital Converter

Code conversion devices in analog-to-digital converters has been reduced by a more logical choice of codes used with the A to D converter

A to D converters have used an internal code of 2-4-2-1 for A to D conversion. This must then be converted to an 8-4-2-1 code for external machines. The 2-4-2-1 code allows the use of the full range of reference voltage, while the 8-4-2-1 code utilizes only nine-fifteenths of the reference since 9 is the highest count achieved for any decimal order.

Since all but the most significant digit of the digital number utilize only a small portion of the reference voltage, some accuracy may be sacrificed by converting those digits directly to BCD or any desired code in the A to D converter. The most significant digit should be capable of using the full range of the reference voltage, so logically should be generated by the 2-4-2-1 code requiring code conversion only for that digit.

In the arrangement, 1 represents the A to D digital register and ladder network. A code converter 2 is required for the most significant digit only, for presenting a BCD representation of an analog voltage to an external register 3.

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