Digitally controlled calibration circuit for a DAC
US5517191A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 12, 1994 |
| Grant date | May 14, 1996 |
| Priority date | — |
| Expiry date | Apr 12, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/66
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.