公开(公告)号：WO1981000924A1

公开(公告)日：1981-04-02

申请号：PCT/US1980001104

申请日：1980-09-08

Applicant: MOTOROLA INC

Inventor： MOTOROLA INC ,  ALLEN G ,  NEIDORFF R

IPC: H01L27/04

CPC classification number: G05F3/265 ,  H01L27/0229 ,  H01L29/735

Abstract: A current source (30) which provides multiple output currents having magnitudes which are of a predetermined ratio of the magnitude of an input current supplied to the current source. The current source includes an input transistor (14) and at least two output transistors (12, 16). The emitters and bases of the input and two output transistors are connected in common with the emitters thereof being connected to a terminal (18) at which is supplied a source of operating potential. The collectors are respectively coupled to individual utilization means. First and second additional transistors (32, 34) are provided having symmetrical structures with the bases thereof being connected to the bases of the output transistors and their emitters connected to the collector of the first output transistor (16). The collectors of the two output transistors are connected respectively to the collector of the input transistor and the collector of the second output transistor (12) whereby all of any saturation current produced by the first output transistor becoming saturated is equally conducted between the two additional transistors to maintain the ratio of input and output currents.

Abstract translation: 一种电流源（30），其提供多个输出电流，其大小具有预先确定的提供给电流源的输入电流的大小的比值。 电流源包括输入晶体管（14）和至少两个输出晶体管（12,16）。 输入和两个输出晶体管的发射极和基极共同连接，其发射极连接到端子（18），在端子（18）处提供工作电位源。 收集器分别耦合到个人利用装置。 提供具有对称结构的第一和第二附加晶体管（32,34），其基极连接到输出晶体管的基极，并且其发射极连接到第一输出晶体管（16）的集电极。 两个输出晶体管的集电极分别连接到输入晶体管的集电极和第二输出晶体管（12）的集电极，由此由第一输出晶体管产生的所有饱和电流饱和都在两个附加晶体管 以保持输入和输出电流的比率。