How can we realize a single supply ECG front end without using Right Leg Drive?
You can purchase a HRM chip (Heart Rate Monitor) chip that performs a single ECG LEAD (Two electrode) single supply ECG monitor qualilty 0.4 to 40 hertz bandwidth device from Analog Devices or you can 'grow your own' using INA's (Instrumentation amplfier's) or operational amplifiers.
IF you choose to grow your own there are multiple ways to do this with a single supply......basically you reference the mid point/common mode point somewhere near the mid-point of the input dynamic range of the front end amplifier and allow the input signals to move about this mid point in a bipolar fashion.
If you choose not to use a third electrode to perform the 'right leg drive' function in the traditional way with three electrodes total, you can still enhance your common mode rejection by use of a pseudo RLD circuit.
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