Resistor string DAC with current mode interpolation
US6252534A · kind A · utility
12Cited by
6References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 14, 1999 |
| Grant date | Jun 26, 2001 |
| Priority date | — |
| Expiry date | Jan 14, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/765
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An N-bit DAC converts an N-bit digital word to an analog voltage. An n-bit modified string DAC, including no more than 2.sup.n taps, receives as an input, n MSBs of the N-bit digital word and provides the analog voltage as an output. An m-bit interpolating DAC, coupled to the n-bit modified string DAC, receives as an input, m LSBs of the N-bit digital word, and provides an analog output to the string DAC. Preferably, n=m=N/2. In an embodiment, the interpolating DAC includes first and second current DACs, each of which provides current to or from the n-bit modified string DAC, depending on the level of the LSBs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.