公开(公告)号：US06664841B1

公开(公告)日：2003-12-16

申请号：US09816621

申请日：2001-03-23

申请人： Yusuf Cetin ,  Graham S. Hamilton ,  Ibrahim G. Yayla

发明人： Yusuf Cetin ,  Graham S. Hamilton ,  Ibrahim G. Yayla

IPC分类号： H03K508

CPC分类号： H03M3/48

摘要： A novel method and apparatus for conditioning an analog signal before it is input to a downstream device such as a delta-sigma analog-to-digital converter is disclosed. An analog conditioning circuit having a reference voltage generator circuit, positive and negative voltage comparators, threshold voltage generator circuits, and a plurality of transistor gate switch limiters is disclosed. The reference voltage generator circuit generates predetermined threshold voltages against which the input signal is compared by the voltage comparators. All conditioning circuit components between the conditioning circuit input and output are electrically disconnected from the circuit when the input signal voltage does not exceed the threshold voltages, thereby minimizing signal distortion in the useful range of the input signal. When the input signal voltage meets or exceeds one of the relevant threshold voltages, the conditioning circuit components rapidly and sharply switch into the signal pathway, and the input signal is “clipped” appropriately. Transistor-based switches are used to provide rapid switching, and to reduce power that is consumed by the circuit when no clipping of the input signal is required. An integrated circuit including the aforementioned conditioning circuit and a delta-sigma analog-to-digital converter, and an electronic device incorporating the integrated circuit, are also disclosed.

摘要翻译： 公开了一种用于在将模拟信号输入到诸如Δ-Σ模数转换器之类的下游装置之前调节模拟信号的新型方法和装置。 公开了具有参考电压发生器电路，正负电压比较器，阈值电压发生器电路和多个晶体管栅极开关限制器的模拟调节电路。 参考电压发生器电路产生预定的阈值电压，通过电压比较器对输入信号进行比较。 当输入信号电压不超过阈值电压时，调理电路输入和输出之间的所有调理电路组件与电路电气断开，从而使输入信号的有用范围内的信号失真最小化。 当输入信号电压达到或超过相关阈值电压之一时，调理电路组件迅速并急剧地切换到信号通路中，并且输入信号被适当地“钳制”。 基于晶体管的开关用于提供快速切换，并且在不需要削波输入信号时降低电路消耗的功率。 还公开了包括上述调理电路和Δ-Σ模数转换器的集成电路以及并入集成电路的电子器件。

公开(公告)号：US06642859B1

公开(公告)日：2003-11-04

申请号：US09611294

申请日：2000-07-07

申请人： Graham S. Hamilton ,  Yusuf Cetin ,  Alan T. Asbeck

发明人： Graham S. Hamilton ,  Yusuf Cetin ,  Alan T. Asbeck

IPC分类号： H03M734

CPC分类号： H03M1/0651 ,  H03M1/747

摘要： An apparatus and method of calibrating a signal sourcing device having a plurality of signal sources to reduce errors between signals generated by the signal sources by categorizing the signal sources into groups based on the amount of error in the signal generated by the signal sources and selecting the signal sources from the groups in a manner which reduces the overall error in selecting signals. For example, the signal sourcing device may be a digital to analog converter having a plurality of current sources that output currents which may have an error. Such an improved digital to analog converter would categorize the current sources into groups based on the amount of error in the current generated by the current sources and selecting the current sources from the groups in a manner which reduces the overall error in selecting signals for the conversion process. The groups may include a center group that straddles the median current generated by the current sources. For example, the digital to analog converter may select current sources from complementary groups where current sources in complementary groups tend to have similar but opposite errors. This calibration method may be used to reduce errors in the signal sources which have a linear, Gaussian, or other error distributions.

摘要翻译： 一种用于校准具有多个信号源的信号源设备的装置和方法，用于基于信号源产生的信号中的误差量将信号源分组成组，以减少由信号源产生的信号之间的误差，并选择 来自组的信号源以减少选择信号的总体误差的方式。 例如，信号源装置可以是具有输出可能具有错误的电流的多个电流源的数模转换器。 这种改进的数模转换器将基于当前源产生的电流中的误差量将电流源分组成组，并且以减少用于转换的信号的总体误差的方式从组中选择当前源 处理。 这些组可以包括跨越由当前源产生的中间电流的中心组。 例如，数模转换器可以从互补组中选择当前源，其中互补组中的当前源倾向于具有相似但相反的错误。 该校准方法可用于减少具有线性，高斯或其他误差分布的信号源中的误差。