公开(公告)号：US06320406B1

公开(公告)日：2001-11-20

申请号：US09677340

申请日：2000-10-02

Applicant: Mark W. Morgan ,  Fernando D. Carvajal ,  Kevin J. Gingerich

Inventor： Mark W. Morgan ,  Fernando D. Carvajal ,  Kevin J. Gingerich

IPC: H03K9007

CPC classification number: H03K19/007 ,  H03K5/1252 ,  H04L25/08

Abstract: An active fail-safe method and apparatus for a LVDS receiver that uses a window comparator circuit to monitor the differential voltage at the receiver's input pins and drive the output to a known logic HIGH state in the absence of a valid input signal; i.e., when the input differential signal is less than a chosen threshold value of approximately 80 mV. Such a condition may occur when the cable is removed or damaged in such a way that no valid input signal is present. In the presence of a valid input signal, the circuit's output tracks the differential input without any degradation to the signal.

Abstract translation: 一种用于LVDS接收机的主动故障保护方法和装置，其使用窗口比较器电路来监视接收机输入引脚处的差分电压，并且在没有有效输入信号的情况下将输出驱动到已知的逻辑高电平状态; 即当输入差分信号小于约80mV的选定阈值时。 当电缆被去除或损坏时，可能会发生这种情况，使得不存在有效的输入信号。 在存在有效输入信号的情况下，电路的输出跟踪差分输入，而不会对信号造成任何降级。

公开(公告)号：US06486695B1

公开(公告)日：2002-11-26

申请号：US09546558

申请日：2000-04-10

Applicant: Chikashi Nakagawara

Inventor： Chikashi Nakagawara

IPC: H03K9007

CPC classification number: H03K5/08 ,  H04L25/08

Abstract: A protecting unit is provided. The protecting unit can prevent accidents from occurring that become problems when data are transmitted due to for instance LVDS and for instance laser light is emitted based on the data. The protecting unit is applied in an instrument comprising an input end to which differential signal is transmitted, the input end being attachable to and detachable from an input line. Here, the voltage at the input end when the input line is not connected is set to a voltage different from that generated at the input end when the input line is connected, variation of the voltage at the input end is transmitted to an input terminal of a differential input/output circuit, and the voltage at the input end or a portion corresponding thereto is compared with a prescribed voltage to fix a state of output of the differential input/output circuit to a prescribed state based on the compared results.

Abstract translation: 提供保护单元。 保护单元可以防止发生数据由于例如LVDS而发生的问题，并且例如基于数据发射激光。 保护单元被应用在包括输入端的仪器中，差分信号被传输到该输入端，该输入端可附接到输入线并可从输入线上拆卸。 这里，输入线未连接时的输入端的电压被设定为与输入线连接时在输入端产生的电压不同的电压，输入端的电压的变化被发送到 将差分输入/输出电路以及输入端或对应的部分的电压与规定电压进行比较，以根据比较结果将差分输入/输出电路的输出状态固定在规定状态。