Bit depth reduction for analog to digital conversion in...

Details Bit depth reduction for analog to digital conversion in... Bit depth reduction for analog to digital conversion in...

2008-01-01

2008-01-01

Issing, Gregory C (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

Reexamination Certificate

active

07315277

ABSTRACT:
Disclosed is a system and method for reducing a bit-depth requirement for an A/D converter in a GPS receiver having an antenna for receiving an analog input signal and a low noise amplifier for amplifying the input signal, comprising a filter for filtering about a bandwidth B the amplified signal; a down-conversion module centering the frequency of the filtered signal about a center frequency f0; an automatic gain controller (AGC) for setting a set point of the input signal; an adder for adding noise to the gain controlled signal, said noise based upon the bandwidth B and center frequency f0; and an analog to digital (A/D) converter for converting the added noise signal to a digital signal, wherein the noise added to the gain controlled signal reduces the bit depth requirement of the A/D converter.

REFERENCES:
patent: 5363112 (1994-11-01), Hatcher
patent: 6498819 (2002-12-01), Martin
patent: 6611794 (2003-08-01), Fleming-Dahl
patent: 6670914 (2003-12-01), Najarian et al.
patent: 6681181 (2004-01-01), Fielder

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