Re: [Discuss-gnuradio] I&Q Sampling

[paul munro]

Am just looking at the data sheet for the ADC's now and noticed the on chip 
Hilbert filter...

Cheers

> From: Matt Ettus <address@hidden>
> To: paul munro <address@hidden>
> CC: address@hidden
> Subject: Re: [Discuss-gnuradio] I&Q Sampling
> Date: Tue, 29 Aug 2006 14:11:42 -0700
>
> paul munro wrote:
>
> >  How does the USRP do its quadrature sampling??
> >
> >  There seems to be many differing methods of achieving this. Some
> >  suggest the the ADC's are off set by 90 deg,
>
> There are 2 ADCs, one samples the I channel, one samples the Q channel.  
> The
>
> >  others that the samples are multiplied by a series of 0,1,0.-1 and
> >  1,0,-1,0 (which seems a waste of samples).
>
> This is a way of using one adc to sample a real bandpass signal and then 
> translate it to complex baseband.
>
> Matt

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