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Interested to develop an AGC for the RF RX chain below. enter image description here

Using the Matlab code as a reference have developed an open loop AGC. Equations as well as block diagram are provided below. enter image description here Wondered how can this be converted into a closed loop structure.

Update:

Seems that the following is a more relevant design. https://sci-hub.tw/10.1109/fskd.2012.6234143 enter image description here Will review further and update.

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  • $\begingroup$ Your output will affect the gain of your variable-gaib amplifier which in turn will affect the signal level digitized by your ADC. For starters do you have a model of your VGA? Either closed-form (Laplace) or a frequency response. $\endgroup$ – Ben Sep 17 '19 at 0:45
  • $\begingroup$ Secondly, your AGC is non-linear which prevents you from obtaining a transfer function. $\endgroup$ – Ben Sep 17 '19 at 0:45
  • $\begingroup$ However, you could linearize around a point of operation to get a linear model valid around this point (i.e. gain) $\endgroup$ – Ben Sep 17 '19 at 0:46
  • $\begingroup$ Thank you Ben. Seems that the following is a more relevant design. sci-hub.tw/10.1109/fskd.2012.6234143 Will review further and update. $\endgroup$ – SenSen Sep 17 '19 at 3:59

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