Non-contact sensing node, systems and methods of remote sensing

A sensing system comprising:

• a non-contact sensing electrode configured to sense an electric potential from an animal subject and provide a sensor signal at an output of the sensing electrode based on the sensed electric potential, wherein the animal subject is spaced a distance apart from and does not contact any part of the sensing electrode;
• an amplifier having a first input, a second input, and an output, in which the output of the sensing electrode is coupled to the first input of the amplifier, the amplifier is configured to provide an amplified output signal at the output of the amplifier representative of at least one measured biosignal based on the sensor signal provided to the first input of the amplifier and a feedback signal provided to the second input of the amplifier;
• and
• a compensation signal generator circuit having an input and an output, in which the input of the compensation signal generator circuit is coupled to the output of the amplifier and the output of compensation signal generator circuit is coupled to the second input of the amplifier, the compensation signal generator circuit is configured to estimate noise based on the amplified output signal at the output of the amplifier, the compensation signal generator circuit is configured to provide the feedback signal to the second input of the amplifier, and the feedback signal includes a filtered signal representative of the estimated noise to cancel the estimated noise and mitigate saturation of the amplifier, wherein the amplifier comprises a trans-impedance amplifier;
• and
• a passive impedance device coupled in a feedback path between the output of the amplifier and the first input of the amplifier, in which a gain of the trans-impedance amplifier is set based on an impedance of the passive impedance device.