University of Michigan

Sung-Yun Park

Euisik Yoon

Kyuseok Lee

An energy harvesting imaging sensor includes an array of pixel structures each formed from a semiconductor having a photodiode overlying a photovoltaic diode. The photodiode and photovoltaic diode are implemented as a vertically stacked P+/N/Pjunction. This structure enables simultaneous imaging and energy harvesting by generating charge in the photodiode that is indicative of light impinging on the photodiode and simultaneously generating charge from the light in the photovoltaic diode located underneath the photodiode.

Imaging sensor and pixel structure for simultaneous imaging and energy harvesting

A biological recording device used to monitor biological electrical activity and a method of recording neural signals. In a preferred embodiment, the biological recording device is a neural probe. The biological recording device includes a probe body with a probe shank and a recording platform that uses a delta (&#x394;) modulator and a delta sigma analog to digital converter (&#x394;&#x3a3; ADC). The &#x394; modulator and the &#x394;&#x3a3; ADC form a &#x394;-&#x394;&#x3a3; analog front end (AFE) architecture for processing biological electrical activity. A large dynamic range (DR) of neural signals, including local field potentials (LFPs) and action potentials (APs) for example, can be compressed and subsequently reconstructed.

Biological recording device and method for recording biological electrical activity

A pulse width modulated power converter is presented with load-adaptive power transistor scaling scheme using analog-digital hybrid control. The coarse digital control generates an approximate duty cycle necessary for driving a given load and selects an appropriate width of power transistors to minimize redundant power dissipation. The fine analog control provides the final tuning of the duty cycle to compensate for the error from the coarse digital control. The mode switching between the analog and digital controls is accomplished by a mode arbiter which estimates the average duty cycle for the given load condition from limit cycle oscillations induced by the coarse adjustments.

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Ann Arbor, MI, United States of America

Sung-Yun Park