1. Below figure shows the schematic of a single channel EMG amplifier. The gain of the whole EMG amplifier (G) is 400 and the gain of the instrumentation amplifier (GINA) is 20. The signal amplified by the instrumentation amplifier is fed to a high-pass filter and the output of the high-pass filter is then fed to a low-pass filter: Instrumentation Amplifier (INA114) High-pass Filter Low-pass Filter The cutoff frequency of the high-pass filter is 80 Hz and the cutoff frequency of the low- pass filter is 1.8 KHz. R1 is 2 K2 and R2 is 1 K. a) Find the value of Ro. b) Complete the below circuit by placing appropriate capacitors and resistors between the junction points. You can also connect the junction points to each other directly (make short circuit) where no resistor or capacitor is necessary. R1 R2 Vss+ Vss- 4 Vss- 4 Electrode_1 IN A114 RG R01 LM358 6 LM358 1 Z R.GZ 3 1 Vout 3 RE + Da Vss Vss+ Electrode_2 Vss- Da 4 4 Referencer c) In the present system, the total gain of the whole amplifier (G) is 500 while the instrumentation amplifier's gain (GINA) is 20. It would be theoretically possible to provide the same total gain (G=500) by setting the gain of the instrumentation amplifier (GINA) to 500 and setting the gains of the filters to 1. Why do we prefer such multistage amplification in the present system? 1. Below figure shows the schematic of a single channel EMG amplifier. The gain of the whole EMG amplifier (G) is 400 and the gain of the instrumentation amplifier (GINA) is 20. The signal amplified by the instrumentation amplifier is fed to a high-pass filter and the output of the high-pass filter is then fed to a low-pass filter: Instrumentation Amplifier (INA114) High-pass Filter Low-pass Filter The cutoff frequency of the high-pass filter is 80 Hz and the cutoff frequency of the low- pass filter is 1.8 KHz. R1 is 2 K2 and R2 is 1 K. a) Find the value of Ro. b) Complete the below circuit by placing appropriate capacitors and resistors between the junction points. You can also connect the junction points to each other directly (make short circuit) where no resistor or capacitor is necessary. R1 R2 Vss+ Vss- 4 Vss- 4 Electrode_1 IN A114 RG R01 LM358 6 LM358 1 Z R.GZ 3 1 Vout 3 RE + Da Vss Vss+ Electrode_2 Vss- Da 4 4 Referencer c) In the present system, the total gain of the whole amplifier (G) is 500 while the instrumentation amplifier's gain (GINA) is 20. It would be theoretically possible to provide the same total gain (G=500) by setting the gain of the instrumentation amplifier (GINA) to 500 and setting the gains of the filters to 1. Why do we prefer such multistage amplification in the present system