Apparatus and method for compensating for DC-offset in direct conversion receiver of wireless communications system
US8620253B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 2010 |
| Grant date | Dec 31, 2013 |
| Priority date | — |
| Expiry date | Jun 13, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/30
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An apparatus and method of compensating for a direct voltage offset in a direct conversion receiver of a wireless communications system is provided. The apparatus includes a voltage control oscillator for generating a local oscillation signal having the same frequency as an input signal, a frequency converter for combining the input signal with the local oscillation signal, a first compensator for determining a first direct voltage offset generated due to a leaked local oscillation signal flowed into the frequency converter, for feeding back a magnitude of the determined first direct voltage offset to the frequency converter and for compensating for the first direct voltage offset, and a first register for storing a magnitude of direct voltage offset for a first variable gain amplifier, wherein the first variable gain amplifier is positioned in a rear end of the frequency converter, connected to the first register, and performs a modem associated offset compensation using a magnitude of direct voltage offset stored in the first register.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.