Hearing aid comprising at least one EEG signal processing circuit

A hearing aid comprising;

• at least one sensor configured to provide a sensing signal, and
• at least one sensing signal processing circuit, comprising a first switch bias buffer circuit comprising:
• a first voltage buffer configured to receive the sensing signal and to provide a first buffer signal at a reduced impedance node, and
• a first switching circuit configured to modulate the output voltage of the first voltage buffer,
• wherein the first voltage buffer comprises a first MOSFET transistor having a first terminal, a second terminal and a third terminal,
• the first terminal voltage being the output voltage of the first voltage buffer,
• the first switching circuit being configured to switch the voltage at the first terminal between a reference voltage and the voltage at the output of the first switch bias buffer circuit
• wherein the at least one sensing signal processing circuit further comprises a second switch bias buffer circuit, comprising:
• a second voltage buffer configured to receive the sensing signal and to provide a second buffer signal at a second reduced impedance node, and
• a second switching circuit configured to modulate the output voltage of the second voltage buffer, the second switch bias buffer circuit being configured to operate in reverse with respect to the first switch bias buffer circuit.