RTL SDR Hardware Architecture

Lucas Ingles lucas.lorenzi at gmail.com
Thu Aug 1 22:16:25 UTC 2013


Thank you very much for your response Steve!
This was exactly what I needed.

Regards,
Lucas


2013/8/1 Steve Markgraf <steve at steve-m.de>

> Hi,
>
> On 01.08.2013 21:25, Lucas Ingles wrote:
> > Which is the actual receiver architecture used in the RTL-SDR dongles? I
> > mean, do we have a Hartley receiver, a Weaver receiver, a zero-IF
> > receiver, a low-IF receiver?
>
> Depends on the tuner, the RTL2832 can be used both in zero-IF and in
> low-IF mode. For the R820T it's low-IF, for all the other tuners
> (including E4K) zero-IF.
>
> > Also, the E4K tuner has two outputs: one output is the in-phase
> > component and the other output is the quadrature component. So, does the
> > RTL2832U has two ADCs to sample the two components? Or just one ADC and
> > it samples the two components interleaved?
>
> It has two ADCs, one for the in-phase and the one for the quadrature
> component.
>
> In the low-IF mode only one of them is used, which one can be selected.
> The generation of the I/Q signals then is done by an internal DDC.
>
> Regards,
> Steve
>
>


-- 
Lucas Lorenzi Ingles
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