Semiconductor device and camera system

By using a capacitor-type amplifier and a refresh circuit in the Hall amplifier circuit, the offset voltage of the Hall element is offset, solving the problem of increased semiconductor device size and achieving device miniaturization and reduced startup time.

CN122247360APending Publication Date: 2026-06-19RENESAS ELECTRONICS CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
RENESAS ELECTRONICS CORP
Filing Date
2025-12-05
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

In the prior art, installing a digital-to-analog converter to offset the offset voltage of the Hall element leads to an increase in the size of the semiconductor device, which is particularly undesirable in small camera systems such as smartphones, and also increases the startup time of the camera system during startup testing.

Method used

A capacitor-type Hall amplifier circuit is used in conjunction with a refresh circuit. The capacitor maintains the correction voltage to offset the offset voltage, reducing the dependence on the digital-to-analog converter, and the refresh operation is performed synchronously with the sensor control signal.

Benefits of technology

This enabled the miniaturization of semiconductor devices, reducing circuit area and cost, while also reducing camera system startup time and power consumption.

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Abstract

Embodiments of this disclosure relate to semiconductor devices and camera systems. The semiconductor device includes a Hall amplifier circuit and an input terminal to which a sensor control signal generated during periods when the image sensor is not performing image acquisition operations is input. In the Hall amplifier circuit, a differential amplifier includes a differential input node for receiving a Hall voltage from a Hall sensor. One end of a plurality of capacitors is connected to the differential input node to determine the gain of the Hall amplifier circuit. A refresh circuit maintains a correction voltage at the differential input node to compensate for offset voltages according to a refresh signal synchronized with the sensor control signal.
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