[help] about adc for L1 gps receiver

Could anyone tell me what type and what bits adc are commonly used ,and the reason? if i want to design such a adc , could you recommend me some reference?Thanks a lot!

You should find all your answers here:

http://shiba.iis.u-tokyo.ac.jp/membe...ecture1_6s.pdf

and

http://www.telecom.fh-htwchur.ch/~zo.../gps_basic.pdf

please refer to the GPS Book from Mr. Pakinson,1996 or the paper from CHANG1982,

GOOD LUCK!

Hi, what's the book and the paper name? Thanks.

Hi,

For 2 bits output, the ADC gives the sign bit and the second bit is MAG bit whch is made high for 30% of the time. You may refer pless, Philsar (formerly) chip specifications for this.

For higher number of bits there seems no clear definition. TI uses 4 bits. But the quantization levels are not clearly defined with respect to others. So it is normally defeined with respect to the baseband processing.

B R M

why the MAG = 1 for 30% time?