The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 18, 1990
Filed:
Nov. 19, 1987
Bar-Giora Goldberg, San Diego, CA (US);
Other;
Abstract
A digital-to-analog converter receives buffered data words from a multiplexer having 'N' inputs, each input receiving data from one of N processing paths, each path having a memory therein which provides the data. Each memory receives address information from a variable-increment counter in its path. The counters are initialized by an offset loader when a frequency is selected. The initialization is a two step process: (1) the counters are loaded with an initial value, and (2) an increment register is loaded with a number equal to N times a primary incremental value corresponding to the frequency. Initially, a first path counter is set to zero, a second path counter is offset by the incremental value, a third path counter is set to twice the incremental value, and so on until the last counter is offset by N-1 times the incremental value. Thereafter all path counters are sequentially incremented by the primary incremental value times N in order from first to last in cycles, and the data from the paths are selected by the multiplexer in the same order. The clocking of each path counter in a cycle precedes the selection of the path by a portion of the cycle sufficient to allow each path time to complete its incrementing process and have settled data at its respective multiplexer input before it is again selected.