US 2024/0192575 A1 · ANALOG FRONT-END CIRCUIT AND CAMERA MODULE CONTROL DRIVER INCLUDING THE SAME

Abstract

An analog front-end circuit includes a hall bias correction loop circuit configured to correct a sensing voltage of a hall sensor by adjusting a hall bias current flowing in the hall sensor while tracking a change in the sensing voltage of the hall sensor based on a temperature change, an offset correction loop circuit configured to correct an offset correction voltage while tracking an offset change of the hall sensor and an offset change of an amplifier circuit based on the temperature change, the amplifier circuit configured to amplify and output the sensing voltage of the hall sensor, corrected through at least one of the hall bias correction loop circuit and the offset correction loop circuit, and an analog-digital converter configured to convert an output voltage of the amplifier circuit into sensing data and output the sensing data.

Claims20

Dependent claims

An analog front-end circuit comprising:

a hall bias correction loop circuit configured to correct a sensing voltage of a hall sensor by adjusting a hall bias current flowing in the hall sensor while tracking a change in the sensing voltage of the hall sensor based on a temperature change;
an offset correction loop circuit configured to correct an offset correction voltage while tracking an offset change of the hall sensor and an offset change of an amplifier circuit based on the temperature change;
the amplifier circuit configured to amplify and output the sensing voltage of the hall sensor, corrected through at least one of the hall bias correction loop circuit and the offset correction loop circuit;
and
an analog-digital converter configured to convert an output voltage of the amplifier circuit into sensing data and output the sensing data.

2 more elements

A control driver of a camera module, the control driver comprising:

a plurality of actuators configured to drive a lens module;
a plurality of hall sensors respectively disposed on the plurality of actuators and configured to sense respective positions of the plurality of actuators and output each sensing signal;
an analog front-end circuit configured to correct a sensing voltage change of each of the plurality of hall sensor based on a temperature change, correct an offset change based on the temperature change, amplify the sensing voltage of each of the plurality of hall sensors, in which the sensing voltage change and the offset change are corrected, and convert the amplified sensing voltage into a plurality of sensing data;
a controller configured to generate a plurality of control signals using the plurality of sensing data;
and
a driver configured to drive the plurality of actuators configured to drive each of the plurality of actuators using the plurality of control signals, respectively.

3 more elements

Dependencies are inferred from the claim text.

Analog front-end circuit and camera module control driver including the same

Life of this patent

Analog front-end circuit and camera module control driver including the same

Life of this patent

Abstract

Claims20