Precision digital-to-analog converters and methods having programmable trim adjustments
US6304201A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2000 |
| Grant date | Oct 16, 2001 |
| Priority date | — |
| Expiry date | Jan 24, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/785
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
N-bit precision digital-to-analog converters are provided that facilitate realization of precision linearities (i.e., linearities that substantially exceed N-bit linearity). They include a binary-weighted current source, current switches and bidirectional-trim digital-to-analog converters. The binary-weighted current source generates binary-weighted currents that are each coupled to the output port by a respective one of the current switches in response to a respective bit of the digital input signal. The bidirectional-trim digital-to-analog converters generate respective bidirectional trim currents with respective amplitudes and directions. Each of the bidirectional-trim digital-to-analog converters is coupled to provide its bidirectional trim current to a respective one of the current switches for a linearizing adjustment of that switch's binary-weighted current. Preferably, the bidirectional-trim currents are slaved to the binary-weighted currents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.