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:
Aug. 21, 2012
Filed:
Jan. 20, 2009
Timothy J. Ridgers, Bayeux, FR;
Yann Le Guillou, Caen, FR;
Fernand Courtois, Saint-Contest, FR;
NXP B.V., Eindhoven, NL;
Abstract
A radio receiver comprises an input () for a modulated radio frequency signal, a frequency down converter () coupled to the input, the frequency down converter including quadrature mixers () for demodulating a received modulated radio frequency signal using a local oscillator signal. An analogue-to-digital converter () is coupled to receive demodulated signals from the mixing means. The analogue-to-digital converter, which may comprise a continuous time sigma delta converter, has an input for a sampling clock frequency (f s). A voltage controlled oscillator () provides the local oscillator signal and supplies a frequency divider () used to provide the sampling clock frequency. The dividing ratio (1/A) of the frequency divider is variable in response to variations in the strength of an 15 output signal from the digital-to-frequency converter and the variations in the frequency of the sampling clock frequency vary the gain of the analogue-to-frequency converter thereby providing automatic gain control.