AD603 voltage gain control circuit

Published:2012/7/23 2:42:00 Author:Ecco | Keyword: voltage gain control | From:SeekIC

This circuit uses two AD603 cascades to realize controllable gain range in 0 dB ~ 60 dB. AD603 monolithic gain range is 10 dB ~ 30 dB, and the range of input control voltage is 0 V ~ l V. Among them, the first-stage AD603 circuit diagram is shown as the figure. As AD603 input impedance is 100 Ω, it must add input buffer to improve the input impedance, then to meet the requirements of the system resistance. In addition, as the front-end circuit affects the noise of the circuit, the circuit uses the amplifier circuit composed of primary op amp AD620 as a pre- amplifier to reduce the noise.



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