Voltage-to-frquency electrocariogram measurement node

A system for acquiring electrocardiogram (ECG) pulses from a subject, the system comprising:

• a virtual ground;
• a plurality of measurement nodes connectable to a plurality of corresponding ECG electrodes, wherein each of the plurality of corresponding ECG electrodes are attachable to the subject and comprise a left arm (LA) measurement node, a right arm (RA) measurement node, and a left leg (LL) measurement node, and a right leg (RL) measurement node, wherein the plurality of measurement nodes are connected to the virtual ground, and wherein each of the plurality of measurement nodes comprises:
• a programmable gain amplifier (PGA) configured to amplify the ECG signal;
• a voltage-to-frequency converter (VFC) configured to convert an ECG signal to a frequency signal;
• an optical converter configured to convert the frequency signal from the VFC to an optical signal, and to output the optical signal via an output fiber-optic cable;
• and
• a DC power converter configured to receive a modulated optical signal via an input fiber-optic cable, to recover DC power from the modulated optical signal, and to supply the DC power to at least the VFC and the optical converter;
• an ECG module configured to provide the modulated optical signal to the plurality of measurement nodes via the input fiber-optic cables respectively, to receive the optical signals from the plurality of measurement nodes via the output fiber-optic cables respectively, and to convert the optical signals to the ECG pulses, wherein no electrical leads are connected between the ECG module and the plurality of measurement nodes;
• and
• a monitor configured to display the ECG pulses output by the ECG module.