Data-directed scrambler for multi-bit noise shaping D/A converters
US5404142A · kind A · utility
97Cited by
6References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 5, 1993 |
| Grant date | Apr 4, 1995 |
| Priority date | — |
| Expiry date | Aug 5, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/502
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A scrambler for use with thermometer-code digital signals and having a number of interconnected identical switching cells in the form of swapper cells with two inputs and two outputs. A control signal determines whether the inputs are connected directly or reversely to the outputs. The control signal is developed by logic circuitry which receives as inputs the two swapper cell input bits and a state bit representing the integrated difference of past swapper output signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.