Receiver having an adjustable bandwidth filter
US5604927A · kind A · utility
29Cited by
3References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1994 |
| Grant date | Feb 18, 1997 |
| Priority date | — |
| Expiry date | Dec 22, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/28
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A radio receiver has a frequency down conversion stage including a first passive filter tuned to a lower frequency. An amplifier functioning as a voltage-to-current converter includes a resistor (60) which can be shunted by a second passive filter in response to actuation of symmetrically arranged switching devices. When the second passive filter shunts the resistor, the overall pass band is raised to a higher frequency. Additionally, the amplifier has a lower noise figure when the second passive filter shunts the transconductor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.