公开(公告)号：US09170595B2

公开(公告)日：2015-10-27

申请号：US13650829

申请日：2012-10-12

Applicant: STMicroelectronics International N.V.

Inventor： Abhirup Lahiri

IPC: H02M3/02 ,  G05F3/24

CPC classification number: G05F3/24 ,  G05F3/245

Abstract: A PTAT circuit includes a first, second, third, and fourth transistors plus a resistor. The first and second transistors have control terminals coupled to each other. The third and fourth transistors have control terminals coupled to each other. The third transistor sources a first current to the first transistor and the fourth transistor sources a second current to the second transistor. The resistor is coupled at a node to the second transistor. A current source circuit sources additional current into the node that is derived from the first and second currents. In one implementation, the additional current is a scaled mirror of the second current. In another implementation, the additional current is a scaled mirror of the sum of the first and second currents. An output current is obtained by mirroring one of the first-third currents. A band-gap output voltage is obtained by applying the additional current across a resistance.

Abstract translation: PTAT电路包括第一，第二，第三和第四晶体管加上电阻器。 第一和第二晶体管具有彼此耦合的控制端子。 第三和第四晶体管具有彼此耦合的控制端子。 第三晶体管向第一晶体管馈送第一电流，而第四晶体管将第二电流馈送至第二晶体管。 电阻器在一个节点处耦合到第二晶体管。 电流源电路将来自第一和第二电流的额外电流输入到节点中。 在一个实现中，附加电流是第二电流的缩放镜。 在另一实施方案中，附加电流是第一和第二电流之和的经比例的镜。 通过镜像第一至第三电流之一获得输出电流。 通过在电阻上施加附加电流来获得带隙输出电压。