AD603 controls the gain through the voltage difference VG between GPOS and GNEG and the connection method between VOUT and FDBK. The range of VG is -0.5V-0.5V. The connection method between VOUT and FDBK is as follows 3 types:
This project adopts the first structure and makes VG=0.25V to obtain a fixed gain of 40dB. If you want to achieve variable gain, just replace the voltage dividing resistor with a variable resistor to change VG.
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