Method and apparatus for maintaining DC bias
US9843292B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 14, 2015 |
| Grant date | Dec 12, 2017 |
| Priority date | — |
| Expiry date | Oct 14, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2410/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A direct current (DC) bias maintenance circuit operably couples to the input of a primary amplifier. The DC bias maintenance circuit employs feedback to maintain the desired DC bias but lacks any coupling to the output of the primary amplifier. By one approach the DC bias maintenance circuit includes a secondary amplifier that replicates at least some near real-time performance characteristics of the primary amplifier. For example, the secondary amplifier can replicate at least certain DC properties of the primary amplifier such that DC-based changes appearing at the output of the primary amplifier are mirrored at an output of the secondary amplifier notwithstanding a lack of any coupling between the output of the primary amplifier and the DC bias maintenance circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.