摘要:
A sensing device comprising: an output area having an output circuit comprising an integrator adapted to integrate a received current so as to generate an output voltage corresponding to the received current; an electrode area comprising: an electrode comprising an exposed, electrically conductive, surface area and electrode circuitry connected to the exposed surface area, wherein the electrode circuitry comprises a voltage-to-current transducer adapted to produce a wire current corresponding to a voltage present at the exposed surface area; and a connecting wire electrically connecting the electrode circuitry to the output circuit, wherein the current received by the output circuit is the wire current.
摘要:
Described herein is a multi-channel biopotential signal acquisition system (900) in which a plurality of biopotential channels is corrected for common-mode interference. Each biopotential channel comprises an electrode (910, 920, 930, 940) for providing a biopotential input signal and an associated amplifier (950, 960, 970, 980) for amplifying the biopotential input signal and for providing a biopotential output signal (955, 965, 975, 985) that is processed in a processor (250, 260, 270, 990). Each biopotential output signal (955, 965, 975, 985) is passed to a common-mode feedback system (810) that determines an average common-mode signal and feeds that signal back to each of the amplifiers (950, 960, 970, 980) in each of the biopotential channels to enhance common-mode rejection ratio of the system (900).
摘要:
The invention provides a biopotential signal acquisition system, comprising at least two active electrodes (10,16) each for receiving a signal from an input, for example in the form of a respective patient contact. A unity gain buffer (32) is used to feed forward a signal from an associated input and provide the buffered output to the amplifiers of the active electrodes as a reference signal. The buffered signal is approximately equal to the input common mode signal so that the effective common mode input voltage appearing at the inputs of each amplifier is significantly reduced. This reduces the common mode gain of the active electrodes and thus improves their common mode rejection ratio while also avoiding saturation of the active electrodes.
摘要:
The invention relates to a biopotential signal acquisition system (100) comprising: an analogue readout unit (10) configured to receive an analogue biopotential signal (BS1) and to extract an analogue measured biopotential signal (BS2) and an analogue reference signal (REF); an ADC unit (20) configured to provide a digital version of the analogue measured biopotential signal (DBS2) and the analogue reference signal (DREF); a first digital filter unit (30) comprising a cascaded integrator-comb filter (32) configured to provide a first digital filtered version (DBS2', DREF') of the digital measured biopotential signal (DBS2) and the reference signal (DREF); and a second digital filter unit (40) configured to calculate a digital motion artifact estimate (MA) based on said first digital filtered version signals (DBS2', DREF'). The invention further relates to an electronic device and a method for acquisition of biopotential signals.