Invention Grant
- Patent Title: Column amplifier reset circuit
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Application No.: US16441674Application Date: 2019-06-14
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Publication No.: US11240456B2Publication Date: 2022-02-01
- Inventor: Hiroaki Ebihara , Zheng Yang
- Applicant: OmniVision Technologies, Inc.
- Applicant Address: US CA Santa Clara
- Assignee: OmniVision Technologies, Inc.
- Current Assignee: OmniVision Technologies, Inc.
- Current Assignee Address: US CA Santa Clara
- Agency: Christensen O'Connor Johnson Kindness PLLC
- Main IPC: H04N5/378
- IPC: H04N5/378 ; H04N5/365 ; H04N5/3745 ; H01L27/146

Abstract:
An amplifier circuit for use in an image sensor includes a common source amplifier coupled to receive an input signal representative of an image charge from a pixel cell of the image sensor. An auto-zero switch is coupled between an input of the common source amplifier and an output of the common source amplifier. A feedback capacitor is coupled to the input of the common source amplifier. An offset switch is coupled to the feedback capacitor and is further coupled to a reset voltage and an output of the amplifier circuit. The auto-zero switch and the offset switch are configured to couple the feedback capacitor to the reset voltage during a reset of the amplifier circuit. The offset switch is configured to couple the feedback capacitor to the output of the amplifier circuit after the reset of the amplifier circuit.
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