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Method for multiple analog-to-digital conversions

A technology of analog-to-digital conversion and analog-to-digital converter, which is applied in the direction of analog/digital conversion, code conversion, signal transmission system, etc., and can solve the problem of low conversion rate

Pending Publication Date: 2022-03-01
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conversion rate of the ADC 90 is lower than that of a conventional SS ADC that performs a single AD conversion per cycle of the ramp reference signal

Method used

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  • Method for multiple analog-to-digital conversions
  • Method for multiple analog-to-digital conversions
  • Method for multiple analog-to-digital conversions

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Embodiment Construction

[0059] The technical solutions of the embodiments are described below in conjunction with the accompanying drawings. It can be understood that the embodiments described below are not all, but only some embodiments related to the present invention. It should be noted that other embodiments that can be derived by those skilled in the art from the embodiments described below are within the protection scope of the present invention without any creative effort.

[0060] figure 1is a schematic block diagram for describing the device provided by the embodiment of the present invention. figure 1 The shown device 10 is an example of the device provided by the embodiment of the present invention.

[0061] Apparatus 10 may be a mobile device with camera functionality, a digital camera, or the like. The mobile device may be a mobile phone, a smart phone, a wireless communication terminal, a tablet device, a personal computer, and the like.

[0062] Such as figure 1 As shown, device 1...

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Abstract

There is provided a method of performing a plurality of analog-to-digital conversions by an analog-to-digital converter (ADC), comprising: receiving a first ramp reference signal whose level varies from an initial level along a slope during each period of the first ramp reference signal and a second ramp reference signal whose level varies from an initial level along a slope during each period of the first ramp reference signal; a level of the second ramp reference signal follows the first ramp reference signal at a given offset from the level of the first ramp reference signal; comparing the second ramp reference signal with an input analog signal; sampling a level of the first ramp reference signal when the second ramp reference signal reaches the analog input signal, and resetting a level of the second ramp reference signal to a level sampled from the first ramp reference signal after the sampling; and generating a digital signal according to a result of the comparison, in which the comparison, the sampling, and the resetting are performed a plurality of times in each period of the first ramp reference signal, and the comparison after the resetting is performed using the reset second ramp reference signal.

Description

technical field [0001] The present invention relates to an analog-to-digital converter (analog-to-digital converter, ADC), in particular, to a multiple conversion ADC. The invention also relates to an image sensor for generating a digital image, such as a static image (still image) or a moving image (video image), and a device having an image sensor, such as a mobile device or a digital camera. Background technique [0002] In recent years, mobile devices such as cell phones, smartphones, wireless communication terminals, tablet devices, or personal computers have a camera function. A mobile device or a digital camera is equipped with an image sensor, such as a complementary metal-oxide-semiconductor (CMOS) image sensor or a charge-coupled device (CCD) image sensor. [0003] The image sensor includes: a plurality of pixels that output analog signals each having a signal level corresponding to the intensity of incident light; and a plurality of ADCs that convert the output a...

Claims

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Application Information

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IPC IPC(8): H03M1/36
CPCH03M1/56H03M1/123H03M1/144
Inventor 樱木孝正
Owner HUAWEI TECH CO LTD
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