On-chip high frequency damping for driver chips

摘要

A driver chip (14) for a laser diode (10) is disclosed which has a circuit to substantially reduce a ringing (Fig. 3) on a laser diode driving current generated by the driver chip. This invention is based on the discovery that the ringing on the laser diode driving current is caused by three different resonances which are coupled together. One or more series RC damping circuits (R1, C3) are fabricated between the main nodes (O, G) of the driver (14) to substantially reduce the ringing on the laser diode driving current. <IMAGE>