Segment digital/analogue converter
US4138667A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 16, 1977 |
| Grant date | Feb 6, 1979 |
| Priority date | — |
| Expiry date | May 16, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/008
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A segment digital/analogue converter for conversion of an eight-bit PCM-work into an analogue output voltage in accordance with the CCITT A-law, with a weighting network and a stepwise switched operational amplifier, with inputs for connection of each bit of said PCM-word with said weighting network and said amplifier via digital gates and low-impedance switches and with a control line for controlling the sign of said output voltage in accordance with the sign-bit of the PCM-word. The converter is characterized by connection to ground of both ends of the weighting network's resistor chain, by two resistors for the continuous resp. the switched input of each a predetermined current to the output line of the weighting network and by a switchable voltage divider at the output of the stepwise switched amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.