Patent ID: 11857328
Assignee: T&W ENGINEERING A/S
Field: Basic communication processes (Electrical engineering)
Classification: CPC A  H | IPC A  H

Claim 21:
22. An active electrode component having an electrode for sensing a bio potential and adapted for providing a bio potential signal, and furthermore comprising:
a shield placed adjacent to and electrically insulated from said electrode;
an integrated amplifier component adapted for providing a buffered signal and comprising:
a first mixer formed on an integrated circuit chip for frequency shifting the bio potential signal from a basic frequency range to a higher frequency range,
an integrated amplifier formed on said integrated circuit chip and receiving the frequency shifted signal from the first mixer, and having a unit-gain, and
a second mixer formed on said integrated circuit chip for frequency shifting an output signal from the integrated amplifier from the higher frequency range to the basic frequency range,
the integrated amplifier component being configured as a chopper modulation amplifier outputting a buffered output signal;
wherein an output of the integrated amplifier component is connected to the shield,
the integrated amplifier component being adapted for actively driving an electrical potential of the shield and thereby providing an active shielding of the electrode,
whereby the shield adjacent to the electrode receives the buffered output signal,
wherein said first mixer receives two input signals and provides first and second chopped output signals, and said integrated amplifier is a differential amplifier having first and second inputs each coupled to receive a respective one of said chopped output signals, and
wherein said second input of said first mixer is connected to receive a feedback signal derived from the output of said integrated amplifier.