Browse Prior Art Database

Improved Signal Commutator

IP.com Disclosure Number: IPCOM000095425D
Original Publication Date: 1964-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Jursik, J: AUTHOR

Abstract

The circuit connects a plurality of inputs A...N to an analog to digital converter 5. Only the first and last inputs are shown. Since the circuitry associated with each input is identical, similar components are designated with the same number. This is followed by a letter to designate the input line with which the component is associated.

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Improved Signal Commutator

The circuit connects a plurality of inputs A...N to an analog to digital converter 5. Only the first and last inputs are shown. Since the circuitry associated with each input is identical, similar components are designated with the same number. This is followed by a letter to designate the input line with which the component is associated.

Each input has a capacitor 10 which can either be connected to the associated input lines or to the input of converter 5. Two single-pole double- throw switches 11 and 12 are provided to switch each capacitor. For example, input line A has capacitor 10A and two switches 11A and 12A. By switches 11A and 12A, capacitor 10A can be either connected to input lines 13A and 14A or to lines 15A and 16A. Each input also has another switch 20, used for multiplexing.

The device operates as follows. Normally, all the switches 11 and 12 are connected to the associated input lines, i.e., to lines 13 and 14. As a first step in the reading process, all switches 11 and 12 are switched so that each capacitor 10 is connected to the associated lines 15 and 16. This can be done at slow speed. The position of all switches 11 and 12 can be changed simultaneously. Then, the various inputs are sequentially gated to converter 5 by sequentially closing switches 20A... 20N. This operation can be performed at high speed.

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