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:
Jun. 26, 2001
Filed:
Jan. 14, 1999
Applicant:
Inventor:
Michael P. Timko, Andover, MA (US);
Assignee:
Analog Devices, Inc., Norwood, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03M 1/78 ; H03M 1/66 ;
U.S. Cl.
CPC ...
H03M 1/78 ; H03M 1/66 ;
Abstract
An N-bit DAC converts an N-bit digital word to an analog voltage. An n-bit modified string DAC, including no more than 2,taps, receives as an input, n MSBs of the N-bit digital word and provides the analog voltage as an output. An m-bit interpolating DAC, coupled to the n-bit modified string DAC, receives as an input, m LSBs of the N-bit digital word, and provides an analog output to the string DAC. Preferably, n=m=N/2. In an embodiment, the interpolating DAC includes first and second current DACs, each of which provides current to or from the n-bit modified string DAC, depending on the level of the LSBs.