The following diagram shows an electromyography (EMG) measurement system. The amplifier uses an op-amp AD620 with the pinout shown in the inset. Amplifier Biceps Reference Electrode a) b) EMG Electrodes c) EMG Oscilloscope RG 1 -IN 2 +IN 3 -Vs 4 AD620 8 RG +Vs 6 OUTPUT 5 REF Design and draw a schematic diagram of the amplifier using AD620 to amplify EMG signals. Describe any potential noise in the EMG measurement system. What is the type of the amplifier structure used in the circuit? Justify the reason of using such amplifier structure in the EMG measurement system. d) To set the gain of AD620, an external resistor RG is connected to Pin 1 and 8, the gain is determined by, e) 49.4 G = RG In order to achieve the gain of 100, determine the value of RG. +1 The common-mode rejection ratio is given by Av (dif) A.(com) CMRR = 20 log Assuming the AD620 has a CMRR = 100, differential gain = 100, calculate the common-mode gain.