Abstract
The objective of this brief presents the implementation, using an AD633 multiplier and three AD844 operational amplifiers, of two different kinds of Automatic Gain Control (AGC) circuits which can adjust the gain of an amplifier to a stable value. As the input signal strengthens, the AGC circuits will decrease the gain of the amplifier. On the contrary, as the input signal weakens, the AGC circuits will increase the gain of the amplifier. Experimental results form two different kinds of AGC circuits, we can know this research will also improve feedback response time and prevent Af from approaching infinity as the denominator of Af tends to zero. (Af is the gain of the feedback amplifier.).
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