Filter center frequency temperature compensation by adjustment of the operating frequency of the host system
US6718167B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 1, 2002 |
| Grant date | Apr 6, 2004 |
| Priority date | — |
| Expiry date | Sep 9, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/28
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An electronic circuit includes a frequency conversion device (4), an oscillator (6), a band-pass filter (8), and a controller (14). The oscillator (6) is connected to the frequency conversion device (4), and the frequency conversion device (4) is connected to the band-pass filter (8). The frequency conversion device (4) is arranged to receive a first signal (S1) at a frequency (ft), and to transform the first signal (S1) into an intermediate frequency signal (S2) at an intermediate frequency (fi) by applying a selection frequency (floc) from the oscillator (6). The band-pass filter (8) is arranged to receive the intermediate signal (S2) and to perform a band-pass filtering at a centre frequency (fbpf) and with a bandwidth (fw), the centre frequency (fbpf) being equal to the intermediate frequency (fi) at a predetermined working temperature of the band-pass filter (8). The controller (14) is capable of receiving data indicative of a shift of the centre frequency (fbpf) due to a temperature deviation of the band-pass filter (8) from the predetermined working temperature and controlling the selection frequency (floc) of the oscillator (6) for changing the intermediate frequency (fi) t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.