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:
Dec. 30, 2003
Filed:
Aug. 30, 2002
Richard Najarian, Palos Verdes Estates, CA (US);
Richard Keegan, Palos Verdes Estates, CA (US);
RF Micro Devices, Inc., Greensboro, NC (US);
Abstract
The present invention provides a GPS receiver using a unique combination of fixed gain and variable gain amplifiers and signal quantization to achieve an integrated receiver that provides for GPS signal extraction with accurate position determination in the presence of interference at a signal level of −60 dBm. In general, the GPS receiver has downconversion circuitry that uses a first synthesizer output signal to reduce an amplified GPS signal to an intermediate frequency signal. Noise automatic gain control circuitry and a gain control circuit control a first variable amplifier and a second variable amplifier, respectively, such that the receiver continues to operate linearly and GPS information carried in the amplified GPS signal is not compressed. Digitization circuitry provides a baseband digitized signal representation of the GPS signal and for interference adaptation to maximize the signal-to-noise ratio of the digitized samples.