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:
Jul. 05, 1977
Filed:
Jan. 28, 1976
John Memishian, Jr, Arlington, MA (US);
Analog Devices, Inc., Norwood, MA (US);
Abstract
An analog-to-digital converter of the successive-approximation type including a digital-to-analog converter (DAC) comprising a plurality of independently-switchable current sources producing identical currents and connected to respective junction points of an R-2R ladder network. The common ladder terminal is driven by an operational amplifier so that the potential of the common terminal tracks that of the ladder output terminal. The ladder common terminal is connected to a comparator together with a sense ground lead. The output of the comparator is directed to bit sequencer circuitry which controls the switching of the DAC current sources to effect a match between the analog input current and the ladder output current.