Patent ID: 8837542

Claim:
A laser diode driving apparatus for optical communication, comprising: a pre-driver; and a main driver, wherein the pre-driver includes a first differential amplifying unit having a plurality of cascode amplifiers CA 1 and CA 2 , in which drains of pnp-type transistors M 1 and M 2 and npn-type transistors M 3 and M 4 are commonly connected to a plurality of output terminals V out1 and V out2 , sources of the pnp-type transistors M 1 and M 2 are connected to a power supply voltage terminal V DD , sources of the npn-type transistors M 3 and M 4 are commonly connected to a ground terminal V SS , gates of the pnp-type transistors M 1 and M 2 are connected to a DC bias voltage terminal V b2 , gates of the npn-type transistors M 3 and M 4 are respectively connected to a plurality of low voltage differential signal input terminals V in1 and V in2 , and a plurality of differential amplified signals are output to the main driver.