Patent ID: 8554312
Filing Date: 2013-10-08
Classification: A61B

Abstract:
1. An apparatus comprising: a first signal line configured to couple signals from a first electrode to a signal detection circuitry for measurement of biometric signals sensed by the first electrode; a second signal line configured to couple a reference signal to a second input of the signal detection circuitry; and a coupling circuitry configured to selectively couple the first signal line and the second signal line to a common electrical potential, and to thereby cause a change in an electric potential of the first electrode and reduction in electrical potential difference between the first signal line and the second signal line, wherein the selective coupling of the coupling circuitry is synchronized with a clock signal controlling sampling instants of an analog-to-digital converter of the apparatus such that the selective coupling is performed between consecutive sampling instants of an analog-to-digital converter without performing selective coupling during sampling instants of the analog-to-digital converter.