Patent ID: 8406263
Filing Date: 2013-03-26
Classification: G11B,H01S

Abstract:
1. A laser diode read driver, comprising: A. a supply lead and a ground lead; B. a first transistor coupled between the supply lead and the ground lead and having a control lead; C. a first resistor connected between the first transistor and the supply lead; D. an input reference current Iout/K connected between the first transistor and the ground lead, the input reference current having a K gain factor; E. a transconductor having a first input connected to the control lead of the first transistor and to between the first transistor and the input reference current Iout/K, the transconductor having a second input, and having an output; F. a second transistor coupled between the supply lead and the ground lead, the second transistor having a control lead that is connected to the output of the transconductor; G. a third transistor coupled between the supply lead and an output, the third transistor having a control lead that is connected to the second input of the transconductor and that is coupled to the second transistor, the first transistor being scaled to the third transistor by the inverse of the gain factor K; and H. a second resistor connected between the third transistor and the supply lead, the first resistor being scaled to the second resistor by the gain factor K.