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:
May. 20, 1986
Filed:
Aug. 06, 1985
Applicant:
Inventors:
David P Burton, Limerick, IE;
Peter Real, Limerick, IE;
Assignee:
Analog Devices, Incorporated, Norwood, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
3403 / ; 3403 / ; 307585 ;
Abstract
A CMOS DAC with means to avoid leakage current. In one embodiment, the back gates of the CMOS switches are held at -200 mV with respect to the output lines, and the logic low level to the off switch also is set at -200 mV relative to the output lines. In another embodiment, the CMOS switches are ion-implanted. In a still further embodiment, the output lines are held at a potential 200 mV more positive than the P- well of the CMOS switches.