公开(公告)号：US20170077943A1

公开(公告)日：2017-03-16

申请号：US15309259

申请日：2015-05-04

Applicant: PYXALIS

Inventor： Laurent SAINT MARTIN ,  Grégoire CHENEBAUX

IPC: H03M1/56 ,  H04N5/378 ,  H04N5/357 ,  H03M1/06 ,  H03M1/12

CPC classification number: H03M1/56 ,  H03M1/00 ,  H03M1/0634 ,  H03M1/12 ,  H03M1/1225 ,  H03M1/123 ,  H03M1/1245 ,  H04N5/3575 ,  H04N5/378

Abstract: Ramp analog-digital converters used in matrix image sensors to provide a digital value representative of a level of illumination of a pixel are provided. Two voltage samples are applied to a comparator, a counter is used to count pulses at a frequency F from a starting instant of the ramp until a toggling of the comparator. Two other voltage samples, one of which is added to a linear voltage ramp having an identical starting instant and slope to the first ramp, are applied to a second comparator, a half counting frequency F/2 is applied to the counter from the toggling of one of the comparators, and the content of the counter at the moment of toggling of the other comparator is stored. Two measurements of samples of the same signal or of two different signals are averaged without undergoing a digital conversion for each signal and a digital addition.

Abstract translation: 提供了在矩阵图像传感器中使用的用于提供表示像素的照明水平的数字值的斜坡模数转换器。 将两个电压样本施加到比较器，计数器用于从斜坡的起始时刻到比较器的切换来对频率F的脉冲进行计数。 将另外两个电压样本（其中之一加到具有相同起始时刻的线性电压斜坡和斜坡到第一斜坡的斜坡上）被施加到第二比较器，半计数频率F / 2从切换 存储比较器之一，并且存储在切换另一个比较器时计数器的内容。 对相同信号或两个不同信号的采样进行两次测量，而不对每个信号进行数字转换和数字加法。