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. 01, 2001
Filed:
May. 18, 1999
Jimmie D Felps, Colorado Springs, CO (US);
Agilent Technologies, Inc., Palo Alto, CA (US);
Abstract
An improved reference loop for a digital-to-analog converter (DAC) uses an approximate 50% duty cycle to improve the DC performance and the drift of the DAC at mid-scale. The 50% duty cycle also allows the DAC to provide the same performance over all outputs irrespective of the number of bits supplied to each input. The 50% duty cycle for the reference loop may be obtained from one of the DAC system outputs by forcing that output to supply a square wave output signal which may be used as input for the reference loop. The reference loop may alternatively be supplied by a DAC clock that is divided to obtain the desired 50% duty cycle input to the reference loop, in which case all outputs of the DAC are available for system output.