D/A converter

US4910514A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Heimbert Irmer · Haar, DE
• Otto Muhlbauer · Munich, DE

Key dates

• Filing date: Nov 28, 1988
• Grant date: Mar 20, 1990
• Expiry date: Nov 28, 2008

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03M1/685
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

A single-step digital-to-analog converter includes a multiplicity of individual interconnected sources disposed in a matrix having matrix rows and matrix columns; a decoder apparatus connected to the matrix for addressing the individual sources, the decoder apparatus including a column decoder for addressing at least the more significant part of an n-bit-wide digital word to be converted and a row decoder in the form of a thermometer decoder. Logic apparatus is connected between the decoder apparatus and the matrix for determining the matrix column of one of the individual sources being addressed and for suppressing switching over of the individual sources of others of the columns. The logic apparatus includes first and second logic devices, the first logic device being connected between the column decoder and the matrix for deriving further column information (E.sub.i) and additional information (S.sub.i) from column information (X.sub.i) in accordance with the logical equations: E.sub.i =S.sub.i and S.sub.i =E.sub.i E.sub.i-l. The second logic device being assigned to each of the individual sources (Q.sub.ik) in accordance with logic equations that determine the connected state o…