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1. 发明授权

US5661395A Active, low Vsd, field effect transistor current source 失效
标题翻译：有源，低Vsd，场效应晶体管电流源
公开(公告)号：US5661395A
公开(公告)日：1997-08-26
申请号：US534900
申请日：1995-09-28
申请人： David K. Johnson , Daniel Edward Skooglund , Michael Anthony Sorna
发明人： David K. Johnson , Daniel Edward Skooglund , Michael Anthony Sorna
IPC分类号： G05F3/24 , G05F3/20
CPC分类号： G05F3/242
摘要： A current source circuit that operates advantageously in the linear region of an FET and that minimizes any voltage drop at its output node which is not load related. The circuit operates under the principle that the output current is dynamically measured without introducing any elements that affects the voltage drop across the FET. Its current source includes a pass device with feedback control, such that a constant current is obtained regardless of the load placed at the output terminal. The operation of the pass device is mirrored by a second pass device having physical dimension that only a fraction of those of the first pass device. A high input impedance differential amplifier, driven by the respective outputs of the first and second pass devices, forces the mirror pass device to the identical voltage as the first pass device.
摘要翻译：一种电流源电路，其有利地在FET的线性区域中工作，并且使其输出节点处的任何电压降最小化，其不负载相关。该电路的工作原理是输出电流被动态测量而不引入任何影响FET两端的电压降的元件。其电流源包括具有反馈控制的通过装置，使得获得恒定电流，而不管放置在输出端子处的负载如何。通过装置的操作由具有物理尺寸的第二通过装置镜像，该尺寸仅为第一通过装置的一部分。由第一和第二通过装置的相应输出驱动的高输入阻抗差分放大器迫使镜面传递装置与第一通过装置相同的电压。

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