公开(公告)号：US08928518B1

公开(公告)日：2015-01-06

申请号：US14014854

申请日：2013-08-30

Applicant: Agilent Technologies, Inc.

Inventor： Dusan Stepanovic

IPC: H03M1/12 ,  H03M1/46

CPC classification number: H03M1/466 ,  H03M1/0656 ,  H03M1/0863

Abstract: A charge redistribution SAR analog-to-digital converter includes a source of a reference voltage, a digital-to-analog converter, and a reset circuit. The digital-to-analog converter includes converter stages that range in significance from most significant to least significant. Each converter stage includes respective capacitors and switches. The switches are controllable to selectively connect the capacitors to the reference voltage or to ground. The capacitors of the converter stages are weighted in capacitance in accordance with significance of the converter stage. The reset circuit is to control the switches to reset the converter stages with a temporal offset between at least two of the converter stages. The temporal offset between the at least two of the converter stages reduces the dependence of the charge drawn from the reference voltage source during each conversion cycle on the sample of an analog input signal converted to a digital value during the conversion cycle.

Abstract translation: 电荷再分配SAR模数转换器包括参考电压源，数模转换器和复位电路。 数模转换器包括从最高有效值到最低有效值的重要性范围的转换器级。 每个转换器级包括相应的电容器和开关。 开关是可控制的，以选择性地将电容器连接到参考电压或接地。 根据转换器级的意义，转换器级的电容器以电容进行加权。 复位电路用于控制开关以在至少两个转换器级之间的时间偏移来重置转换器级。 至少两个转换器级之间的时间偏移降低了在转换周期期间在每个转换周期期间从参考电压源抽取的电荷对在转换周期中转换为数字值的模拟输入信号的采样的依赖性。

公开(公告)号：US08872691B1

公开(公告)日：2014-10-28

申请号：US13886608

申请日：2013-05-03

Applicant: Agilent Technologies, Inc.

Inventor： Dusan Stepanovic

IPC: H03M1/34

CPC classification number: H03M1/06 ,  H03M1/46

Abstract: A method of operating an analog to digital converter (ADC) comprises comparing an analog input signal to a reference signal, using a comparator, and generating a comparator output according to the comparison, storing the comparator output in at least one memory unit, monitoring the stored comparator output to determine whether a difference between the analog input signal and the reference signal is within a predetermined range, and detecting a metastability error upon determining that the difference between the analog input signal and the reference signal is within a predetermined range.

Abstract translation: 一种操作模数转换器（ADC）的方法包括：使用比较器将模拟输入信号与参考信号进行比较，并根据比较产生比较器输出，将比较器输出存储在至少一个存储单元中，监视 存储比较器输出，以确定模拟输入信号和参考信号之间的差是否在预定范围内，并且在确定模拟输入信号和参考信号之间的差在预定范围内时检测亚稳态误差。