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[Discuss-gnuradio] RF Gain and BB gain of XCVR2450

From: Jorge Miguel
Subject: [Discuss-gnuradio] RF Gain and BB gain of XCVR2450
Date: Mon, 1 Nov 2010 17:36:35 +0100

I will rephrase former question.
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,

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