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1. 发明授权

US4138641A Instrument amplifier and load driver having offset elimination and common mode rejection 失效
标题翻译：仪表放大器和负载驱动器具有偏移消除和共模抑制
公开(公告)号：US4138641A
公开(公告)日：1979-02-06
申请号：US788421
申请日：1977-04-18
申请人： Richard A. Karlin , Kirk K. O. K. Rim
发明人： Richard A. Karlin , Kirk K. O. K. Rim
IPC分类号： G01R1/30 , G01R19/00 , H03F3/45 , H03F1/26
CPC分类号： G01R1/30 , G01R19/0084 , H03F3/45479
摘要： The disclosure describes improved apparatus for driving a load, such as a meter, in proportion to a source voltage produced by a signal generator. The apparatus includes a non-differential gain stage for generating an amplified voltage between a gain stage output and one of the generator outputs. The non-differential gain stage is followed by a differential stage which generates a rereferenced voltage between the differential stage output and one of the load terminals. The rereferenced voltage is proportional to the amplified voltage and is substantially independent of any offset voltage between the one generator output and the one load terminal. By coupling the rereferenced voltage to the load, the load voltage is made proportional to the source voltage irrespective of changes in the offset voltage between the one generator output and the one load terminal. The load may include a meter and an amplifying stage for ranging and zeroing the meter.
摘要翻译：本公开描述了与由信号发生器产生的源电压成比例的用于驱动诸如仪表的负载的改进的装置。该装置包括用于在增益级输出和发生器输出之一之间产生放大电压的非差分增益级。非差分增益级之后是差分级，其在差分级输出和负载端子之一之间产生重新引用的电压。重新引用的电压与放大的电压成比例，并且基本上与一个发电机输出端和一个负载端子之间的任何偏移电压无关。通过将重新引用的电压耦合到负载，负载电压与源电压成比例，而与一个发电机输出和一个负载端之间的偏移电压的变化无关。负载可以包括用于测量和调零仪表的仪表和放大级。

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