Differential current-steering digital-to-analog converter
US7369077B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 12, 2006 |
| Grant date | May 6, 2008 |
| Priority date | — |
| Expiry date | Sep 12, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/745
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Differential, current-steering DACs with reduced small signal differential non-linearity. A set of binary-weighted steerable constant current generators is used in which each constant current generator comprises a ternary constant current generator configured to generate a three-state differential current in response to a ternary signal on a control input. Each ternary current generator is associated with a bit of the binary code. The DAC further comprises a code converter coupled between a digital input, to receive a signed digital value for conversion, and control inputs of the steerable current generators, to convert the binary input code to a ternary code to control the steerable current generators to provide a differential analogue output. In embodiments the smallest current source is ½I0 where I0 is a change in differential output current caused by an lsb change in the binary input code.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.