Low noise filter for a wireless receiver
US7415264B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 2004 |
| Grant date | Aug 19, 2008 |
| Priority date | — |
| Expiry date | May 28, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/372
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A low noise filter is arranged to receive an input signal from a downconverter. The low noise filter is constructed to block or cancel any DC offset in the input signal, as well as filter selected frequency components from the input signal. The low noise filter uses a shared capacitor both to handle the DC offset and to set filter response characteristics. As the low noise filter is implemented with a Frequency Dependent Negative Resistance (FDNR) device, the shared capacitor may be relatively small. The low noise filter has a load capacitor, with the output of the load capacitor coupled to a bias resistor and voltage. This bias structure cooperates with the load capacitor to set a high cutoff frequency for the low noise filter useful for blocking or canceling the DC offset.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.