Patent ID: 11885673
Assignee: PROPHESEE
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. An event-based vision sensor that includes a plurality of pixels, each pixel comprising:
a photosensitive element configured to generate a current signal in response to brightness of light impinging on the photosensitive element;
a converter configured to receive the current signal from the photosensitive element and generate a voltage signal based on the received current signal;
a capacitor electrically coupled to the converter in series and configured to receive the voltage signal from the converter;
an open-loop amplifier electrically coupled, at an input, to the capacitor in series and configured to generate, at an output, an amplified signal based on an output signal from the capacitor, wherein there is no feedback between the output and the input of the open-loop amplifier, and further wherein the open-loop amplifier comprises a plurality of stacked transistors providing a well-controlled and high-accuracy open-loop gain of the open-loop amplifier, wherein a gate of at least one of the plurality of stacked transistors is configured to receive a bias voltage that sets an operation point of the open-loop amplifier; and
a reset device electrically coupled between the input and the output of the open-loop amplifier and configured to reset the open-loop amplifier in response to a trigger signal being generated.