Rules | Recent posts | topic RSS | Search | Register  | Log in

Building GPS receiver chip

 
Post new topic  Reply to topic    EDAboard.com Forum Index -> RF, Microwave, Antennas and Optics
Author Message
nuntha



Joined: 01 Apr 2004
Posts: 22
Post10 Jun 2004 11:47   Building GPS receiver chip
Hi ,
I am intending to build a GPS receiver chip in CMOS. As I am not a good system guy I have a system question.

The GPS received signal is -130dBm
Receiver NF = 10 (upto last IF amp)
noise BW = 2MHz (before despreading)
Output SNR at the last IF amp is -23dB {inorder to acheive 20dB SNR after despreading as the coding gain is 43dB)

Hence knowing the output SNR of the last IF amplier is -23dB what is the ouput signal level at the last IF amplifier in dBm?

Thanks in advance
Back to top
brmadhukar



Joined: 21 Jun 2002
Posts: 844
Helped: 29
Post12 Jun 2004 17:20   Re: Building GPS receiver chip
Hi,
I was involved very much in GPS for OEM both at RF/System level.

You need to know that the ADC requires sufficient input signal strength for quantization. Only the noise should be able to trigger the quantization.
So get a "quote" for you ADC levels. Then you will be able to decide the overall gain.

BR
Madhukar
Back to top
Post new topic  Reply to topic    EDAboard.com Forum Index -> RF, Microwave, Antennas and Optics
Page 1 of 1 All times are GMT + 2 Hours


Abuse
Administrator
Moderators
topic RSS 
sitemap