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Automatic gain control circuit using dynamic range VGA

Posted: 14 Oct 2008     Print Version  Bookmark and Share

Keywords:automatic gain control  VGA  op amp 

Low frequency automatic gain control (AGC) circuits are used in audio and power equipment for applications such as sensitive microphone preamplifiers (preamps) and regulators. An AGC circuit is a closed-loop feedback system. The loop consists of a controllable gain element, a detector, a stable reference and a comparison circuit.

This application note by Analog Devices describes a low frequency AGC circuit using a wide dynamic range AD8336 variable gain amplifier (VGA) from Analog Devices as the gain control element, an AD736 rms-to-DC converter as the detector, a low cost rail-to-rail AD8551 op amp and an ADP3339 LDO as the reference. Because of its wide controllable gain range and circuit flexibility, the AD8336 is featured in this application note.

View the PDF document for more information.





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