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60 dB Wide Dynamic Range, Low Frequency AGC Circuit Using a Single VGA


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, a closed-loop feedback system, is shown in Figure 1. The loop consists of a controllable gain element, a detector, a stable reference and a comparison circuit.

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ADP3339, AD8551, AD8336, AD736
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