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公开(公告)号:US5640681A
公开(公告)日:1997-06-17
申请号:US149886
申请日:1993-11-10
CPC分类号: G05F3/262
摘要: A cascode current mirror circuit includes a cascode connected input stage (401) that operates to conduct an input current (400) in response to an input voltage of an input signal coupled to an effective transconductance of the cascode connected input stage (401). An input mirroring transistor (404) operates to control a mirror reference current (406) in response to the input voltage of the input signal. A diode connected transistor (409) coupled to a second control node of the cascode connected input stage (410) generates a control bias proportional to the mirror reference current (406) and to the input signal. A cascode connected output stage (411) has a first control node (413) coupled to the input signal and a second control node (414) coupled to the diode connected transistor (409) and the second control node (410) of the cascode connected input stage (401) for establishing an output current (415) that is substantially equivalent to the input current (400).
摘要翻译: 共源共栅电流镜电路包括共源共栅连接的输入级(401),其操作以响应耦合到共源共栅连接的输入级(401)的有效跨导的输入信号的输入电压来传导输入电流(400)。 输入镜像晶体管(404)用于响应于输入信号的输入电压来控制镜参考电流(406)。 耦合到共源共栅连接的输入级(410)的第二控制节点的二极管连接晶体管(409)产生与镜参考电流(406)成比例的控制偏置和输入信号。 级联连接的输出级(411)具有耦合到输入信号的第一控制节点(413)和耦合到二极管连接的晶体管(409)的第二控制节点(414)和连接的共源共栅的第二控制节点(410) 输入级(401),用于建立基本上等于输入电流(400)的输出电流(415)。