US20250294266
2025-09-18
Electricity
H04N25/709
An advanced image sensor is designed to improve noise reduction through an innovative power management strategy. This sensor comprises a pixel array, row driver, and power management devices, all working together to enhance image quality by minimizing noise interference. The pixel array is organized into multiple groups across rows and columns, converting light into electrical signals that form pixel signals.
The pixel array's primary function is to capture light and convert it into electrical signals. These signals are organized into pixel groups, which are controlled by a row driver. The row driver generates control signals that manage the operation of the pixel array's rows, ensuring precise and efficient signal processing.
One or more power management devices play a crucial role in the system by generating a power supply voltage necessary for the row driver's operation. These devices respond to an input signal to produce the required control signals. The power management unit ensures stable voltage supply, which is essential for maintaining consistent image sensor performance.
Each power management device incorporates two chopping circuits to address noise issues. The first chopping circuit modulates the input signal, while an amplifier generates an output signal from this modulated input. The second chopping circuit demodulates the output signal and modulates noise produced by the amplifier, effectively reducing noise interference in the final signal.
The integration of chopping circuits within the power management devices significantly enhances noise reduction capabilities of the image sensor. By modulating and demodulating signals, these circuits minimize amplifier-induced noise, leading to clearer and more accurate image capture. This approach ensures high-quality performance of the image sensor in various lighting conditions.