On 09/24/2013 10:30 AM, bob wole wrote:
On 09/23/2013
11:07 PM, bob wole wrote:
Can somebody please guide me on this ?
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.
Hi Marcus thanks for response, If there is no
automatic gain control then how does it is ensured
that ADC doesn't saturate ? I mean what if there is a
signal whose amplitude is greater that ADC's highest
input level ? Won't it saturate the ADC ? Also what
if the signal is too weak to span much of the ADC
input voltage, then again we are not using all
bits effectively. Guide please.
Thanks,
Bob
>>--
>>Marcus Leech
>>Principal Investigator
>>Shirleys Bay Radio Astronomy Consortium
>>http://www.sbrac.org
|
There is nothing to ensure that ADC values are neither "too little"
nor "too big". That's up to your application. There's an RF gain
control on the
WBX, for example, that gives 31.5dB of gain control. If you
have very weak signals, then you have to use an external LNA. If
your dynamic
range requirements exceed the 80dB dynamic range of the ADC, then
your application has to account for this, and adjust RF gain
accordingly.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
|