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:
Sep. 27, 2011
Filed:
Sep. 11, 2009
Frank Hagemeyer, Wedemark, DE;
Frank Hagemeyer, Wedemark, DE;
Sennheiser electronic GmbH & Co. KG, Wedemark, DE;
Abstract
There is provided an FM demodulator comprising a transistor (Q), a filter unit for producing first and second amplitude-modulated signals from a received frequency-modulated signal, wherein the filter unit is coupled to the switching transistor (Q), and first and second diodes (D) connected in opposite relationship for rectifying the first and second amplitude-modulated signals of the filter unit. The filter unit has an LC network and is so dimensioned that there is a linear relationship between the output voltage and the input frequency. The demodulator further has an operating point adjusting unit for adjusting an operating point of the transistor. The operating point adjusting unit () is adapted to effect operating point adjustment with a noise negative feedback.