In: Electrical Engineering
0. We are designing an ECG circuit that has three parts, including (1) Instrumentation Amplifier (2) High-pass filter (3) Low-pass filter. Each part should have the gain of 10, so the entire circuit should have the gain of 1000. We will add a LED driver at the end to be lit when detecting heartbeat.
Design
1. Design a differential amplifier with the gain equal to one and use 10k? for its feedback resistor. Calculate the resistor value on the non-inverting end with the actual measurement of all other resistors and combine up to 4 resistors to achieve the best CMRR.
2. Add the non-inverting front-end circuit to the differential amplifier designed in step 1 to create an instrumentation amplifier. The instrumentation amplifier requires a gain of 10.