AGC and Dynamic Range of ADC

GNU Radio
1

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

2

Can somebody please guide me on this ?

Bob

3

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

4

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

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.