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    Analog to digital converter for electrical signals
    2.
    发明授权
    Analog to digital converter for electrical signals 失效
    模拟数字转换器电子信号

    公开(公告)号：US3859654A

    公开(公告)日：1975-01-07

    申请号：US29670772

    申请日：1972-10-11

    Applicant: IBM

    Inventor： HARRISON THOMAS J ,  HELLWARTH GEORGE A ,  JAEGER RICHARD C

    IPC: H03M1/50 ,  H03M1/00 ,  H03K13/20

    CPC classification number: H03M1/50

    Abstract: Unknown bipolar analog signals are converted to equivalent digital signals by comparison with positive and negative reference voltages. Sampling is performed for a preselected time period during which the reference voltages are alternately compared against the unknown analog signal. The reference polarity is switched each time the comparison result indicates a polarity change. Counting of clock pulses during all times one of the reference voltages is applied for the preselected period results in the digital equivalent of the analog input.

    Abstract translation: 与正和负参考电压相比，未知的双极模拟信号被转换为等效的数字信号。 在预选的时间段执行采样，在此期间参考电压与未知模拟信号交替地进行比较。 每次比较结果表示极性变化时，参考极性被切换。 在所有时间内对时钟脉冲进行计数，一个参考电压被施加在预选的周期，导致模拟输入的数字等效。

    Integrating ramp analog to digital converter
    3.
    发明授权
    Integrating ramp analog to digital converter 失效
    将数字转换器集成到数字转换器

    公开(公告)号：US3582947A

    公开(公告)日：1971-06-01

    申请号：US3582947D

    申请日：1968-03-25

    Applicant: IBM

    Inventor： HARRISON THOMAS J

    IPC: H03M1/00 ,  H03K13/02

    CPC classification number: H03M1/00 ,  H03M1/50

    Abstract: A multiple integrating ramp analog to digital converter is provided wherein an unknown analog input signal is coupled to an integrator for a variable time. The variable time is determined by an integral number of cycles of operation of a counter which is stepped at a predetermined rate while the unknown voltage is being integrated. During this time the output voltage of the integrator goes from an initial level to a second level. When the required time has elapsed, a reference voltage of opposite polarity to the unknown input voltage is coupled to the integrator and the counter is stepped at the predetermined rate. During this time the output voltage of the integrator starts from the second level and, when the initial voltage level appears at the output of the integrator, the counter is stopped and that count then provides a digital representation of tee unknown analog input signal.

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