Re: [Discuss-gnuradio] AGC and Dynamic Range of ADC

[Robert McGwier]

Well that is 80 dB of dynamic range inside the Nyquist zone (at best and let's call it N).  I can add a "bit" of increase in dynamic range by downsampling (filter and decimation) and growing the accumulator size by a bit for each decimation by 4.  This will increase dynamic range.  I don't believe this is happening to a large extent in the N210 unless it is included in you 80 dB number which I believe is you just doing 14 bits of ADC is 80 dB.  

Bob

On Mon, Sep 23, 2013 at 11:54 PM, Marcus D. Leech <address@hidden> wrote:

On 09/23/2013 11:07 PM, bob wole wrote:

Can somebody please guide me on this ?

Bob

On Fri, Sep 20, 2013 at 4:44 PM, bob wole <address@hidden> wrote:

I have USRPN210 with WBX and RFX2400. Is there any AGC chip on N210 motherboard or WBX, RFX2400 before ADC to utilize the dynamic range of ADC ? if yes, which one? If not, then won't the varying input signal (for example signal from moving object)  to ADC affect the performance of ADC ?

Bob

The ADC on an N210 has over 80dB of dynamic range.  If that isn't enough, then your application can adjust the RF gain to taste.

Only a subset of applications actually benefit from the usual hardware AGC schemes, and such schemes are invariably application-specific, so there's
  no *automatic* gain control.  But your application can dynamically make gain adjustments as it goes.

-- 
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org

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Bob McGwier
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Professor Virginia Tech

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