Dynamic DC balancing of a direct conversion receiver and method
US6771945B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 2000 |
| Grant date | Aug 3, 2004 |
| Priority date | — |
| Expiry date | May 24, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D3/008
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A direct conversion receiver includes a differential mode mixer with first and second DC coupled amplifier chains, the first and second amplifier chains are connected to the mixer for amplifying differential signals. A common mode offset correction circuit is coupled to the first and second amplifier chains so as to feedback correction signals that cause common mode DC offsets in the first and second amplifier chains to be equal and opposite. A differential mode offset correction circuit is coupled to the first and second amplifier chains so as to feedback correction signals that cause differential mode DC offsets in the first and second amplifier chains to be equal. The only solution for the two correction circuits is zero DC offset.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.