On Mon, Nov 1, 2010 at 11:52 AM, Eric Blossom <address@hidden
> On Mon, Nov 01, 2010 at 05:36:35PM +0100, Jorge Miguel wrote:
>> I will rephrase former question.
> Jorge, I don't know the answer to your question, but I do that the
> answer is in the source code that is associated with the XCVR2450.
> You haven't specified whether you're using the UHD or not and whether
> or not you're on a USRP1 or USRP2, all of which may matter.
> In any event, I'd look for files that contain "2450" in their name :-)
> "find" and "grep" are powerful command line tools for this kind of
> stuff, and would allow you to answer your own question quickly, or to
> at least generate a more refined question, that indicated that you'd
> "tried the obvious".
> To increase your chances of getting assistance on this list (or any
> list for that matter), please read and follow the suggestions here:
>> When using the XCVR2450, up to 92dB gain in rx mode is allowed.
>> However this gain is shared between to places. Gain at RF and then gain at
>> baseband (after the mixing)
>> It is very important (from the point of view of the Noise Figure) how gain
>> is shared.
>> There is a register B7 to B1 which control the gain to the MAX2829 chip
>> placed inside the XCVR2450.
>> The first 2 bits are critical since they define 3 states: High gain (11),
>> Medium gain(10) and Low gain (0X)
>> I would like to know how the overal gain configunation setting (0-92 dB) is
>> shared between theses two places and what the limits to be in high, medium
>> and low gain state are.
>> Where I can find it?
>> Many thanks,
>> I would like to know how the gain setting (up to 92 dB in Rx mode) of the
>> MAXIM2829 is sorted between the two amplifiers placed around the mixer.
>> I is clear in the data sheet what the total gain is depending on the gain
>> settings but it is not clear where the gain is. Most of them can be before
>> the mixer (RF gain), or after the mixing (BB gain)......Is it possible to
>> find it out? I would like to model this receiver.
>> Many thanks,