公开(公告)号：WO1981002233A1

公开(公告)日：1981-08-06

申请号：PCT/US1980001585

申请日：1980-11-24

Applicant: MOTOROLA INC

Inventor： MOTOROLA INC ,  LOCASCIO J ,  JARRETT R

IPC: H03F03/14

CPC classification number: B03B9/00 ,  C10C3/007 ,  C10G1/00 ,  C10L9/00 ,  F23K1/00 ,  G05F3/265 ,  H03F3/347

Abstract: Three terminal current source (10) including a current turn around circuit comprising first (12) and second (14) transistors. The emitters of the pair of transistors are coupled to a common terminal (20) with the collector of the first one of the pair of the transistors being coupled to an input terminal at which is supplied a reference current (25) with the collector of the other one of the pair of transistors being coupled in cascode through the emitter collector path of an output transistor (24) to the output terminal (34) of the current source circuit. The base electrodes of the pair of transistors are directly connected to each other with the control electrode of the output transistor being connected to the collector of the first one of the pair of transistors of the current turn around circuit. A single lateral split collector transistor (26) is utilized to improve the current match between the input and output of the current source wherein the emitter of this transistor is connected to the base electrodes of the pair of transistors of the current source with one collector and the base of the split collector transistor being connected to the collector of the second one of the pair of transistors. The other one of the collectors of the split collector transistor is connected directly to the output terminal of the current source. The aforedescribed structure provides a current source having improved matching characteristics over a temperature range which varies from -40`C to +125`C.

Abstract translation: 包括第一晶体管（12）和第二晶体管（14）的包括电流转向电路的三端电流源（10）。 一对晶体管的发射极耦合到公共端子（20），其中一对晶体管中的第一晶体管的集电极耦合到输入端子，在该输入端子处与参考电流（25）的集电极 一对晶体管中的另一个通过输出晶体管（24）的发射极集电极路径以共源共栅耦合到电流源电路的输出端（34）。 一对晶体管的基极电极直接连接，输出晶体管的控制电极连接到电流转向电路的一对晶体管的第一个的集电极。 单个横向分离集电极晶体管（26）用于改善电流源的输入和输出之间的电流匹配，其中该晶体管的发射极与一个集电极连接到电流源的一对晶体管的基极， 分离集电极晶体管的基极连接到该对晶体管中的第二晶体管的集电极。 分离集电极晶体管的另一个集电极直接连接到电流源的输出端。 上述结构提供了在-40℃至+ 125℃变化的温度范围内具有改进的匹配特性的电流源。