Input boosting for chopped neural recording systems

A front-end for a neural recording system, the front-end comprising:

• a sensor comprising first and second sensor output terminals;
• a feedback subsystem comprising first and second feedback output terminals;
• a first chopper comprising first and second input terminals, and first and second output terminals, wherein:
• the first input terminal of the first chopper is electrically coupled to the first sensor output terminal,
• the second input terminal of the first chopper is electrically coupled to the first feedback output terminal,
• a second chopper comprising first and second input terminals, and first and second output terminals, wherein:
• the first input terminal of the second chopper is configured to be electrically coupled to the second sensor output terminal,
• the second input terminal of the second chopper is configured to be electrically coupled to the second feedback output terminal;
• an amplifier comprising first and second amplifier input terminals;
• a first capacitor coupled to the first output terminal of the first chopper and the first amplifier input terminal;
• a second capacitor coupled to the second output terminal of the first chopper and the second amplifier input terminal;
• a third capacitor coupled to the first output terminal of the second chopper and the second amplifier input terminal;
• and
• a fourth capacitor coupled to the second output terminal of the second chopper and the first amplifier input terminal;
• wherein the first and second choppers are configured to operate in a first phase and a second phase, wherein:
• during the first phase:
• the first sensor output terminal, the second feedback output terminal, and the first and fourth capacitors are in electrical communication with the first amplifier input terminal, and
• the second sensor output terminal, the first feedback output terminal, and the second and third capacitors are in electrical communication with the second amplifier input terminal;
• and
• during the second phase:
• the first sensor output terminal, the second feedback output terminal, and the second and third capacitors are in electrical communication with the second amplifier input terminal, and
• the second sensor output terminal, the first feedback output terminal, and the first and fourth capacitors are in electrical communication with the first amplifier input terminal.