公开(公告)号：US20040222360A1

公开(公告)日：2004-11-11

申请号：US10435119

申请日：2003-05-09

Applicant: FINISAR CORP.

Inventor： Darin James Douma ,  Stephan C. Burdick

IPC: H01J040/14

CPC classification number: H04B10/0799

Abstract: In an embodiment of the invention the circuit for monitoring an optical signal detector comprises a current divider current mirror and a current multiplier current mirror. The current divider current mirror has a mirror leg and a primary leg. The primary leg is coupled to the optical signal detector. The current divider current mirror is configured to generate mirror leg current corresponding with a fraction of the primary leg current. The current multiplier current mirror has a mirror leg and a primary leg coupled to the mirror leg of the current divider current mirror. The current multiplier current mirror is configured to generate mirror leg current corresponding with a multiple of the primary leg current. In another embodiment the circuit comprises a first and second current mirror. The first current mirror has a primary current leg and a mirror current leg with the primary current leg exhibiting a resistance corresponding with a fractional part of the resistance exhibited by the mirror current leg, and with the primary current leg of the first current mirror series coupled between the optical signal detector and one of an electrical source and an electrical sink. The second current mirror has a primary current leg and a mirror current leg with the mirror current leg of the second current mirror exhibiting a resistance corresponding with a fractional part of the resistance exhibited by the primary current leg of the second current mirror, and with the primary current leg of the second current mirror series coupled with the mirror current leg of the first current mirror.

Abstract translation: 在本发明的实施例中，用于监测光信号检测器的电路包括分流器电流镜和电流乘法器电流镜。 电流分流器电流镜具有镜腿和主支腿。 主支路耦合到光信号检测器。 电流分流器电流镜被配置为产生对应于主支路电流的一部分的镜腿电流。 当前的乘法器电流镜具有耦合到分流器电流镜的镜腿的镜腿和主腿。 当前乘法器电流镜被配置为产生对应于主支路电流的倍数的镜腿电流。 在另一个实施例中，电路包括第一和第二电流镜。 第一电流镜具有初级电流支路和反射镜电流支路，其中初级电流支路表现出与镜电流支路呈现的电阻的分数部分相对应的电阻，并且第一电流镜阵列的初级电流支路耦合 在光信号检测器和电源和电汇之一之间。 第二电流镜具有初级电流支路和反射镜电流支路，其中第二电流镜的反射镜电流支路呈现出与第二电流镜的初级电流支路呈现的电阻的分数部分相对应的电阻，并且与 与第一电流镜的反射镜电流支路耦合的第二电流镜系列的初级电流支路。