Wireless receiver
US8923443B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2013 |
| Grant date | Dec 30, 2014 |
| Priority date | — |
| Expiry date | May 2, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/06
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A direct-conversion type wireless receiver includes a pair of mixers for frequency-converting a radio signal received from an antenna into a base band signal by local signals having different phases; a first amplification circuit for amplifying the base band signal up to a demodulation level; a second amplification circuit provided between the mixer and the first amplification circuit; and a variable current circuit including a multi-stage current mirror to add a current 2n times as high as a reference current. The wireless receiver further includes a control unit configured to correct a DC offset of the mixer by allowing a current to flow into the second amplification circuit from the variable current circuit, based on an output of the first amplification circuit, and a capacitor connected between a gate and a source of a PchMOSFET which allows the reference current to flow therethrough.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.