GPS front end having an interface with reduced data rate

Details GPS front end having an interface with reduced data rate GPS front end having an interface with reduced data rate

2005-07-29

2010-02-16

Payne, David C (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

Reexamination Certificate

active

07664206

ABSTRACT:
A radio frequency integrated circuit for a global positioning system (GPS) application mixes radio frequency GPS signals from an external source with a predetermined intermediate frequency that is less than 4fo. In one embodiment, the intermediate frequency is selected to be 1.5fo. An intermediate frequency filter then band-limits the intermediate frequency GPS signals, rolling off at a frequency in the vicinity of 2.5 MHz to achieve substantial attenuation at 3.5-4.0 MHz. An automatic gain control circuit amplifies the filtered intermediate frequency GPS signals to proper voltage levels. The amplified intermediate frequency GPS signals is then digitized by an analog-to-digital converter at a predetermined sampling rate more than twice the intermediate frequency to provide samples of a predetermined number of bits, which are then provided for base band processing by a general purpose microprocessor over an industry-standard serial bus.

REFERENCES:
patent: 6675003 (2004-01-01), Dubash et al.
patent: 2005/0104774 (2005-05-01), Pande
patent: 2005/0239451 (2005-10-01), Periyalwar et al.
patent: WO 99/13595 (1999-03-01), None
International Search Report for International Application No. PCT/2006/018007.
Written Opinion for International Application No. PCT/US2006/018007.

Affiliated with

Also associated with

Rating

GPS front end having an interface with reduced data rate does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with GPS front end having an interface with reduced data rate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and GPS front end having an interface with reduced data rate will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4171794