Calibration technique for current steering DAC
US9548752B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 2016 |
| Grant date | Jan 17, 2017 |
| Priority date | — |
| Expiry date | Feb 19, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/785
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The disclosure provides a current steering digital to analog converter (DAC) that includes a plurality of DAC elements. At least one DAC element of the plurality of DAC elements is coupled to a calibration circuit. The calibration circuit includes a fixed current source coupled to a primary node of the DAC element through a first estimation switch. A digital code generator is coupled to the primary node, and generates a first digital code corresponding to a primary voltage generated at the primary node. The digital code generator generates a second digital code. A correction DAC is coupled to the digital code generator and generates a bias voltage based on the second digital code. The bias voltage is provided to the DAC element such that a current flowing through each DAC element of the plurality of DAC elements is equal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.