Browse Prior Art Database

Analog Output System

IP.com Disclosure Number: IPCOM000095634D
Original Publication Date: 1964-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Propster, CH: AUTHOR

Abstract

The system provides a plurality of simultaneous analog output voltages. Any one of n X axis switches can be selected and closed by an appropriate control system such as a computer. Correspondingly, any one of m Y axis switches can be selected and closed. If the selected X and Y axis switches are closed and all others are open, closing switch S(G) causes a current I(1) to flow along the indicated path through the selected Y switch, a circuit Txy, the selected X switch to V(2).

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Analog Output System

The system provides a plurality of simultaneous analog output voltages. Any one of n X axis switches can be selected and closed by an appropriate control system such as a computer. Correspondingly, any one of m Y axis switches can be selected and closed. If the selected X and Y axis switches are closed and all others are open, closing switch S(G) causes a current I(1) to flow along the indicated path through the selected Y switch, a circuit Txy, the selected X switch to V(2).

A Txy circuit includes a current transformer having a primary winding connected to the matrix through diode D(1). The current I(1) in the selected primary winding induces a current I/n' in the secondary winding. This current flows through diode D(2) into capacitor C and the load Z.

The average value of the current I(2) which flows through Z is chiefly proportional to the magnitude of the pulsed primary current I(1), the length of time the current flows in the primary and the frequency at which the current pulses are applied to the primary. Variable output signals at each load Z can, therefore, be obtained by varying singly, or in combination, the frequency of scan at an output point, the magnitude of current I(1) applied to an individual output point, or the saturation of current I1(1) applied to an individual output point.

In one arrangement, variable output signals at each load Z are obtained by programming the operation of the selection switches S to recurrently scan...