[hpsdr] mercury adc

[Bob McGwier]

Naaa.  That is perfect.  That is all there is to it.  Now you need to say
what the limit is on the growth of the accumulator size as you downsample,
you need to take into account the quantization effects on the filter
coefficients and the finite precision arithmetic of the multiplies and adds
but decimation is all there is to it.

Bob


ARRL SDR Working Group Chair
Member: ARRL, AMSAT, AMSAT-DL, TAPR, Packrats,
NJQRP, QRP ARCI, QCWA, FRC.
"Trample the slow ....  Hurdle the dead"


-----Original Message-----
From: hpsdr-bounces at lists.hpsdr.org [mailto:hpsdr-bounces at lists.hpsdr.org]
On Behalf Of Lyle Johnson
Sent: Wednesday, September 24, 2008 12:55 PM
To: alex brown
Cc: hpsdr at lists.hpsdr.org
Subject: Re: [hpsdr] mercury adc

***** High Performance Software Defined Radio Discussion List *****

> how do you get 119 db dynamic range of a 16 bit adc surely it should be 96
db

In a word: decimation.

As you decimate, you reduce the noise and improve the sensitivity.  This 
is oversimplified, of course.

73,

Lyle KK7P

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