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the incremental gains of the VGA from the loop dynamics viewpoint?

Question asked by hoo on Apr 1, 2017
Latest reply on Apr 4, 2017 by hoo

I began to learn the knowledge of AGC from this article"DESIGN AND OPERATION OF UTOMATIC GAIN CONTROL LOOPS FOR RECEIVERS IN MODERN COMMUNICATIONS SYSTEMS".

I can hardly understand the concept of "the incremental gains of the VGA".

 

i have copied the content on the following:

from the datasheet of AD8367, 20*log(Vout/Vin)= 50*(Vg-0.1)

 

how 0.6447Vrms/V came out(where did Vin go)? what does it mean??

 

if any one can help that would be apprecaite!

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