Current/resistor digital-to-analog converter having enhanced integral linearity and method of operation
US5283580A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1992 |
| Grant date | Feb 1, 1994 |
| Priority date | — |
| Expiry date | Sep 28, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/765
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A digital-to-analog converter (10) uses series-connected resistors (55-59) to implement conversion of most significant bits of a digital input signal to an equivalent analog output signal. Current sources (22-26) are used to implement conversion of least significant bits of the digital input signal to the analog output signal. After making a binary-to-thermometer code conversion of the least significant bits, first logic circuitry (70) provides control signals (SI) for controlling the switching of each of the current sources to either a first (42) or a second (44) node. After making a binary to `one of` code conversion of the most significant bits, second logic circuitry (86) provides control signals (SR) for respectively switching the first and second nodes to any two resistor nodes of the resistors. The resistors are connected between a reference voltage terminal and a third node where the analog output signal is developed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.