Accurate and stable encoding with low cost circuit elements
    7.
    发明授权
    Accurate and stable encoding with low cost circuit elements 失效
    具有低成本电路元件的精确而稳定的编码

    公开(公告)号:US3914760A

    公开(公告)日:1975-10-21

    申请号:US31678972

    申请日:1972-12-20

    Applicant: IBM

    Inventor: LOGUE JOSEPH C

    CPC classification number: H03M1/56

    Abstract: This accurate and stable analog to digital conversion system and circuits useful therewith is based upon selective counting of high frequency electrical signal oscillations generated by a phase locked frequency multiplication network. The network contains only low cost components. Accuracy and stability derive from maintenance of predetermined phase locked relationship between the signal derived through frequency division of the network output signal and a cyclic reference signal which is also the reference for gating the encoding counts (i.e. the reference for measurement of the analog parameter which is to be encoded). The network output frequency is a harmonic of the frequency of the reference signal. Feedback phase control is developed through interaction of the frequency divided network output with the reference signal in a phase comparator circuit. A novel circuit arrangement for generating the reference signal in the form of ramp oscillations is also disclosed.

    Abstract translation: 这种精确和稳定的模数转换系统和有用的电路是基于对由锁相倍频网产生的高频电信号振荡的选择性计数。 该网络只包含低成本组件。 精度和稳定性来源于通过网络输出信号的分频得到的信号与循环参考信号之间的预定锁相关系的维持,循环参考信号也是用于选通编码计数的参考(即,用于测量模拟参数的参考, 被编码)。 网络输出频率是参考信号频率的谐波。 在相位比较器电路中,通过频率分频网络输出与参考信号的相互作用来开发反馈相位控制。 还公开了一种以斜坡振荡的形式产生参考信号的新型电路装置。

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