Microcontrolled electrocardiographic monitoring circuit with feedback control

A microcontrolled electrocardiographic monitoring circuit with bias saturation feedback, comprising:

• an input signal path comprising an electrode, a low pass filter, and an amplifier, each connected in-line, the electrode configured to sense an input signal via a conductive surface and the amplifier configured to output a filtered amplified output signal;
• a microcontroller circuit comprising an input codec, comprising:
• an analog-to-digital converter connected to the input signal path through an output of the amplifier and configured to convert the filtered amplified output signal into a data stream of discrete digital values;
• a feedback generation generator configured to compare the discrete digital value to a bias saturation threshold for the input signal path and configured to select a pairing of drive resistor settings as a digital feedback signal in relation to relative closeness of the discrete digital value to the bias saturation threshold;
• and
• an input/output module configured to output the digital feedback signal through a pair of output terminals;
• persistent memory connected to the microcontroller circuit via a peripheral serial interface bus, which stores each of the discrete digital values in the data stream into the persistent memory;
• and
• an output signal path comprising an electrode and a buffer, each connected in-line, and a pair of drive resistors connected in parallel to an input terminal of the buffer and to the output terminals of the feedback;
• generator, the microcontroller circuit configured to adjust each drive resistor according to the digital feedback signal, and the electrode configured to provide an output signal via a conductive surface.