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Re: [Discuss-gnuradio] Why 4 ADC's?
From: |
Johnathan Corgan |
Subject: |
Re: [Discuss-gnuradio] Why 4 ADC's? |
Date: |
Wed, 18 Jul 2007 13:04:46 -0700 |
User-agent: |
Thunderbird 1.5.0.12 (X11/20070604) |
Ian Larsen wrote:
> I assume this also true for the BasicRX daughterboard? (Doesn't do
> downconversion, but does do analog multiplication to get I and Q?)
Almost. The boards don't do anything with the signal, but have separate
I and Q inputs that go to the ADCs as is.
On the FPGA, however, there are digital mixers that you can use to
convert a center frequency down to baseband, so you get a complex I and
Q signal out of that, even if you only supply a signal to the I input.
That is what is actually happening when you "tune" a BasicRX or LFRX board.
--
Johnathan Corgan
Corgan Enterprises LLC
http://corganenterprises.com
- [Discuss-gnuradio] Why 4 ADC's?, Ian Larsen, 2007/07/17
- Message not available
- Re: [Discuss-gnuradio] Why 4 ADC's?, Ian Larsen, 2007/07/18
- Re: [Discuss-gnuradio] Why 4 ADC's?, Roshan Baliga, 2007/07/18
- Re: [Discuss-gnuradio] Why 4 ADC's?,
Johnathan Corgan <=
- Re: [Discuss-gnuradio] Why 4 ADC's?, Jeff Brower, 2007/07/18
- Re: [Discuss-gnuradio] Why 4 ADC's?, Roshan Baliga, 2007/07/18
- Re: [Discuss-gnuradio] Why 4 ADC's?, Jeff Brower, 2007/07/19
- Re: [Discuss-gnuradio] Why 4 ADC's?, Johnathan Corgan, 2007/07/19
- Re: [Discuss-gnuradio] Why 4 ADC's?, Jeff Brower, 2007/07/19
- Re: [Discuss-gnuradio] Why 4 ADC's?, Eric Blossom, 2007/07/19
- Re: [Discuss-gnuradio] Why 4 ADC's?, Jeff Brower, 2007/07/19
- Re: [Discuss-gnuradio] Why 4 ADC's?, Ian Larsen, 2007/07/18
- Re: [Discuss-gnuradio] Why 4 ADC's?, Jeff Brower, 2007/07/19