公开(公告)号：US12250487B2

公开(公告)日：2025-03-11

申请号：US18315579

申请日：2023-05-11

Applicant: NOVATEK MICROELECTRONICS CORP.

Inventor： Pai-Hsiang Hsu ,  Chao-Yu Meng ,  Yueh-Ru Lee

IPC: H04N25/78 ,  H04N25/77

Abstract: An image readout device includes comparator circuits. Each comparator circuit includes an amplifier, an input capacitor, an auto-zero switch, and a control capacitor. The amplifier compares a pixel signal to a reference signal to generate a comparison signal. The input capacitor receives the pixel signal or the reference signal. The auto-zero switch couples or decouples the input node and the output node of the amplifier. The control capacitor receives a respective control signal. Alternatively, the control capacitor can be replaced with a control switch. The control switch is coupled to the auto-zero switch in parallel. The control switch and the control capacitor can be omitted. Instead, the voltage level of the reference signal is adjusted to change the transition time points of the comparison signal.

公开(公告)号：US20250008242A1

公开(公告)日：2025-01-02

申请号：US18216606

申请日：2023-06-30

Applicant: NOVATEK Microelectronics Corp.

Inventor： Pai-Hsiang Hsu ,  Yueh-Ru Lee

IPC: H04N25/78 ,  H03K5/24

Abstract: A comparator includes an input stage, a gain stage, an output stage and a clamp circuit. The input stage receives an input signal and a ramp signal and generates a first output signal. The gain stage, coupled to the input stage, receives the first output signal and generates a second output signal. The output stage, coupled to the gain stage, receives the second output signal and generates a third output signal. The clamp circuit, coupled to the gain stage and the output stage.