发明授权
US06586918B2 Current generator circuit and method of providing drive current to a laser diode driver 有权
电流发生器电路和向激光二极管驱动器提供驱动电流的方法

  • 专利标题: Current generator circuit and method of providing drive current to a laser diode driver
  • 专利标题(中): 电流发生器电路和向激光二极管驱动器提供驱动电流的方法
  • 申请号: US10041470
    申请日: 2002-01-10
  • 公开(公告)号: US06586918B2
    公开(公告)日: 2003-07-01
  • 发明人: David Martin Gee
  • 申请人: David Martin Gee
  • 优先权: EP01303927 20010430
  • 主分类号: G05F156
  • IPC分类号: G05F156
Current generator circuit and method of providing drive current to a laser diode driver
摘要:
To provide a stabilized current to a current modulator or the like in a limited voltage headroom environment, the a current mirror having first and second mirror transistors is provided. Bases of the transistors are coupled together through a resistive element, with base leakage current to the first transistor generating a voltage drop across the resistive element. The voltage drop acts to boost a voltage through an emitter resistor of an output stage of the current mirror, the output stage realized by at least the second mirror transistor. With boosting of the voltage through the emitter resistor there is a corresponding boost in output current defined by the voltage across emitter resistor. As such, the circuit effectively increases the operating voltage and hence the voltage headroom derived from a supply voltage provided to the bases of the first and second mirror transistors.
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