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. 04, 2002
Filed:
May. 31, 2000
Ka Y. Leung, Austin, TX (US);
Douglas R. Holberg, Wimberley, TX (US);
Cygnal Integrated Products, Inc., Austin, TX (US);
Abstract
A digital-to-analog converter (DAC) employs a main DAC resistor string and a sub-resistor string formed in a semiconductor material. A main DAC conversion circuit is formed with a headroom resistor in series with the main DAC resistor string. The headroom resistor provides an operating voltage for current drivers in the sub-resistor string. The headroom resistor is formed adjacent to the main DAC resistor string in the semiconductor material to provide street effect compensation thereto. In practice, the main DAC resistor string is formed as two sets of resistor strings. The headroom resistor is formed as a first resistor string adjacent one main DAC resistor string set, and as a second resistor string adjacent the other main DAC resistor string set. The plural resistors of the headroom resistor strings have resistor values equal to the plural resistors of the respective main DAC resistor string sets.