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US 2016/0242645 A1Published application
Systems and methods for electrocorticography signal acquisition
AssigneeThe Regents of the University of California
InventorRikky Muller
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Abstract
Systems and methods for biosignal acquisition, and in particular, electrocorticography signal acquisition, are disclosed for small area, low noise recording and digitization of brain signals from electrode arrays.
Claims25
An apparatus for acquisition of signals from a sensor interface, comprising:
- a chopper-stabilized, open-loop amplifier, said amplifier comprising:
- one or more input up-modulation chopper switches;
- a Gm stage;
- and
- one or more down-modulation chopper switches;
- said amplifier having an input for receiving signals from said sensor interface and an output;
- and
- wherein said output is fed back to the input through a low-pass filter.
5 more elements
A circuit for acquisition of signals from a sensor interface, comprising:
- a forward path comprising:
- an input up-modulation chopper module;
- an amplifier having an input coupled to the up-modulation chopper module;
- a down-modulation chopper module coupled to an output of the amplifier;
- and
- an ADC having an input coupled to the down-modulation chopper module and a digital output;
- and
- a mixed-signal feedback loop from the digital output to the amplifier input;
- wherein the mixed-signal feedback loop comprises a digital filter.
6 more elements
A circuit for acquisition of signals from a sensor interface, comprising:
- a forward path comprising:
- a chopper-stabilized voltage-to-current converter;
- wherein chopper down-modulation is applied to an output current of the converter;
- a current-input loop filter;
- and
- an ADC;
- and
- a mixed-signal feedback path emanating from a digital output of the ADC;
- the mixed-signal feedback path comprising a DAC having an output feeding back into the forward path.
6 more elements
Dependencies are inferred from the claim text.