This paper introduces the characteristic and function of AD8369,which functions inside as a digitally controllable gain amplifier. Digitally controllable gain amplifier based on AD8369 was designed, with the MSP430G2544 digital signal processor (DSP) combined with AD8369 to realize gain control. The circuit realization form of the cascaded AD8369 to realize the large dynamic range controllable gain amplifier is presented. Finally, the structure of the system, the hardware structure and the test results are given.
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