首页>
外国专利>
Imaging systems with sub-radix-2 charge sharing successive approximation register (SAR) analog-to-digital converters
Imaging systems with sub-radix-2 charge sharing successive approximation register (SAR) analog-to-digital converters
展开▼
机译:具有次基2电荷共享逐次逼近寄存器(SAR)模数转换器的成像系统
展开▼
页面导航
摘要
著录项
相似文献
摘要
An image sensor may contain an array of imaging pixels arranged in rows and columns. Each column of imaging pixels may be coupled to a column line which is used to read out imaging signals from the pixels. The column line may be coupled to an analog-to-digital converter for converting analog imaging signals from the pixels to digital signals. The analog-to-digital converter may be implemented as a charge sharing successive approximation register (SAR) analog-to-digital converter (ADC). The SAR ADC may include a comparator coupled to a feedback digital-to-analog converter (DAC). The comparator may have a non-zero comparator offset. The feedback DAC may include capacitors that are scaled using a sub-radix-2 sizing scheme to help improve tolerance to the comparator offset while enabling resolutions of up to 10-bits or more.
展开▼
机译:图像传感器可以包含以行和列布置的成像像素的阵列。成像像素的每一列可以耦合到用于从像素读出成像信号的列线。列线可以耦合到模数转换器,用于将来自像素的模拟成像信号转换成数字信号。模数转换器可以被实现为电荷共享逐次逼近寄存器(SAR)模数转换器(ADC)。 SAR ADC可以包括耦合到反馈数模转换器(DAC)的比较器。比较器可以具有非零的比较器偏移。反馈DAC可以包括使用sub-radix-2大小调整方案缩放的电容器,以帮助提高对比较器偏移的容限,同时实现高达10位或更高的分辨率。
展开▼