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A low power highly sensitive Thoracic Impedance Variance (TIV) and Electrocardiogram (ECG) monitoring SoC is designed and implemented into a poultice-like plaster sensor for wearable cardiac monitoring. 0.1 Ω TIV detection is possible with a sensitivity of 3.17 V/Ω and SNR > 40 dB. This is achieved with the help of a high quality (Q-factor > 30) balanced sinusoidal current source and low noise...
A continuous time electrode skin impedance monitoring system is implemented in parallel with ECG monitoring. To avoid degradation of the ECG signal quality, chopper stabilized AC current sources are adopted. Measured impedance signal is used as a reference signal input for a post processing adaptive filter removing motion artifacts in the ECG signal. The impedance measurement core is implemented in...
We propose a novel dual-mode neural stimulator circuit. For stimulation requiring small or medium amount of charge, the stimulator supplies a constant current to the stimulation load in the same way as any standard current-mode stimulator. For high-charge stimulation applications, the stimulator supplies a variable stimulus current, depending on the voltage available across the current generator circuit...
An integrated front-end architecture for in-vivo detection is presented. The system is conceived to be implanted under the human skin. The powering and communication between this device and an external primary transmitter are based on an inductive link. The presented architecture is oriented to two different approaches, defining a true/false alarm system, based on amperometric or impedance biosensors...
This paper details the design and operation of a two-stage current-input current-output topology suitable for three-electrode amperometric sensor measurements. The first stage is an interface providing current-follower block, whereas the second stage is a novel hyperbolic-sine-based current amplification stage. The linear amplification stage bases its operation upon the compressive sinh-1 conversion...
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