FW: [Premium-Rx] The new R&S EM510 Direct-Sampling HF Receiver

[Adam Farson]

Hi Chuck,

R&S do not state the actual sampling rate, so I assumed 64 Msps and
considered the worst case. I imagine that the EM510 also uses digital
down-conversion by means of down-sampling to reduce the effective IF
bandwidth of the digital signal presented to the DSP.  

Cheers for now, 73,
Adam VA7OJ/AB4OJ


-----Original Message-----
From: premium-rx-bounces at mailman.qth.net
[mailto:premium-rx-bounces at mailman.qth.net] On Behalf Of Chuck Hutton
Sent: 15 February 2007 22:37
To: 'Premium-Rx'
Subject: RE: [Premium-Rx] The new R&S EM510 Direct-Sampling HF Receiver

Adam:

96 dB would indeed be the limit if there was nothing else in the picture.
However.....

A common technique these days is to oversample and decimate. A 4-times
oversampling with decimation gains you an additional bit of resolution. Do
that several times (to take a 65 Msps down to the width of a ham band or
sub-band or several SW channels or....) and you'll get easily get 18 bits or
more of accuracy.

Here's a fairly simple and clear explanation:
http://www.atmel.com/dyn/resources/prod_documents/doc8003.pdf


Chuck



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