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Integrating ramp circuit with reduced ramp settling time

A technology of integrator and ramp signal, applied in the field of image sensor

Active Publication Date: 2021-09-28
OMNIVISION TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It will be appreciated that the ramp settling time or delay of the ramp signal generated by the ramp generator and received by the comparator can limit the maximum frame rate of the image sensor

Method used

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  • Integrating ramp circuit with reduced ramp settling time
  • Integrating ramp circuit with reduced ramp settling time
  • Integrating ramp circuit with reduced ramp settling time

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Embodiment Construction

[0019] Examples are described herein for a ramp generator that provides a ramp signal with reduced ramp settling time. In the following description, numerous specific details are set forth in order to provide a thorough understanding of examples. One skilled in the art will recognize, however, that the techniques described herein may be practiced without one or more of the specific details, or with other methods, components, materials, etc. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects.

[0020] Reference throughout this specification to "one example" or "one embodiment" means that a particular feature, structure, or characteristic described in connection with the example is included in at least one example of the present invention. Thus, appearances of the phrase "in one example" or "in one embodiment" in various places in this specification are not necessarily all referring to the same exa...

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Abstract

The present invention relates to an integrating ramp circuit with reduced ramp settling time. The ramp generator includes an integrator including a first stage and a second stage, wherein the first stage has a first input and a second input, and a first output and a second output, and the second stage A first transistor and a second transistor are included that are coupled between the power rail and ground. The node between the first transistor and the second transistor is coupled to the output of the integrator amplifier. The control terminal of the first transistor is coupled to the first output of the first stage, and the control terminal of the second transistor is coupled to the second output of the first stage. During a ramp event in the ramp signal generated from the output, a first current flows from the output to ground. A trim circuit is coupled to the output of the integrator amplifier to provide a second current to the output of the integrator amplifier in response to the trim input. The second current substantially matches the first current.

Description

technical field [0001] The present invention relates generally to image sensors, and in particular, but not limited to, comparator output circuits for analog-to-digital conversion in image sensors. Background technique [0002] Image sensors have become ubiquitous. They are widely used in digital cameras, cellular phones, security cameras, as well as in medical, automotive and other applications. The technology used to manufacture image sensors has been evolving at a rapid pace. For example, the need for higher resolution and lower power consumption encourages further miniaturization and integration of these devices. [0003] Image sensors typically receive light on an array of pixels, which creates an electrical charge in the pixels. The intensity of light can affect the amount of charge generated in each pixel, with higher intensities generating higher amounts of charge. An analog-to-digital converter (ADC) is often used in a CMOS image sensor (CIS) to convert the char...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/378H04N5/374
CPCH04N25/76H04N25/75H03F3/45475H03F2203/45156H03F2203/45512H03K4/502H03K4/56H03M1/123H03M1/56H03F3/45269H04N25/709H04N25/778
Inventor 左亮王睿海老原弘知江妮君
Owner OMNIVISION TECH INC