The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 06, 2004
Filed:
Aug. 01, 2002
Maarten Visee, Houten, NL;
Agere Systems Inc., Allentown, PA (US);
Abstract
An electronic circuit includes a frequency conversion device ( ), an oscillator ( ), a band-pass filter ( ), and a controller ( ). The oscillator ( ) is connected to the frequency conversion device ( ), and the frequency conversion device ( ) is connected to the band-pass filter ( ). The frequency conversion device ( ) is arranged to receive a first signal (S ) at a frequency (f ), and to transform the first signal (S ) into an intermediate frequency signal (S ) at an intermediate frequency (f ) by applying a selection frequency (f ) from the oscillator ( ). The band-pass filter ( ) is arranged to receive the intermediate signal (S ) and to perform a band-pass filtering at a centre frequency (f ) and with a bandwidth (f ), the centre frequency (f ) being equal to the intermediate frequency (f ) at a predetermined working temperature of the band-pass filter ( ). The controller ( ) is capable of receiving data indicative of a shift of the centre frequency (f ) due to a temperature deviation of the band-pass filter ( ) from the predetermined working temperature and controlling the selection frequency (f ) of the oscillator ( ) for changing the intermediate frequency (f ) to follow the shift of the centre frequency (f ).