Direct conversion receiver for amplitude modulated signals using linear/log filtering
US7113760B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 2003 |
| Grant date | Sep 26, 2006 |
| Priority date | — |
| Expiry date | Jul 8, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/30
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A receiver circuit that includes a direct conversion receiver that receives a modulated signal, and generates an in-phase differential signal and a quadrature-phase differential signal. The receiver circuit includes an in-phase branch that processes the in-phase differential signal, and a quadrature-phase branch that processes the quadrature-phase differential signal. Each branch includes an amplifier and a summer. The amplifier is configured to receive and amplify the respective in-phase or quadrature-phase differential signal. The summer receives the resulting amplified differential signal and sums the signals to generate a single signal. A log amplifier receives the summed in-phase and quadrature-phase signal, and generates an RSSI signal that is proportional to the log of the difference between the two summed signals. The data may then be extracted based on the amplitude of the RSSI signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.