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This paper describes a micropower instrumentation amplifier that enables chronic biopotential sensing in battery powered applications. The amplifier is chopper-stabilized to eliminate excess noise from 1/f or popcorn processes, insuring the highest fidelity of signal measurement for diagnostic analysis. The circuit consumes 2.0μW of power from a 1.8V supply, with a noise floor of 0.94μVrms in a bandwidth...
This paper describes a prototype acceleration sensor that enables chronic motion sensing in battery powered applications. The design facilitates inertial measurement with minimal area, power penalty, and routing concerns by converting three axes of acceleration into three independent analog output channels in a single package. The sensor includes on-chip memory to store trim codes during production,...
A chopper-stabilized instrumentation amplifier is targeted for "deep-brain" human implants and consumes 2.2muW from a 1.8V supply. The integrated noise from 0.5 to 100 Hz is 0.94muV, providing a noise efficiency factor of 4.9. The use of chopper stabilization provides rail-to-rail inputs and 105dB CMRR. An integrated 0.5Hz HPF is used to suppress electrode offsets. The circuit is also used...
This paper describes a prototype micropower instrumentation amplifier intended for chronic sensing of neural field potentials (NFPs). NFPs represent the ensemble activity of thousands of neurons and code-useful information for both normal activity and disease states. NFPs are small - of the order of tens of muV- and reside at low bandwidths that make them susceptible to excess noise. Therefore, to...
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