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. 14, 1996
Filed:
Apr. 12, 1994
John Wynne, Dooradoyle, IE;
Analog Devices, Inc., Norwood, MA (US);
Abstract
A digitally controlled calibration circuit for a DAC includes a primary DAC having a first reference current input, a second input for receiving a digital signal representative of the DAC conversion factor, and an output for providing the analog signal; a secondary calibration DAC has associated with it a reference network connected to a first input of the secondary DAC for conducting a reference current, and a device for connecting the output of the secondary DAC to the reference network, the second DAC includes a second input for receiving a digital signal for adjusting the output of the secondary DAC fed back to the reference network for adjusting the reference current; and a device for interconnecting the reference current with the first reference current input of the primary DAC for digitally controlling the reference current input of the primary DAC for digitally controlling the reference current to that primary DAC and digitally effecting calibration of the primary DAC.