| 摘要 |
In a laser-driving device including a high-frequency current generating circuit generating a high-frequency current superimposed on a control current output from a light intensity control circuit for light intensity control, and supplied to a laser diode as a drive current, the high-frequency current generating circuit has a sourcing current source, a sinking current source, current switches connected between the current sources and a drive output terminal respectively, a gated oscillation circuit oscillating with a desired frequency, and switch drive circuits complementarily on/off controlling the current switches by using a drive switching signal obtained by removing a high-frequency component from an output signal of the oscillation circuit. The present invention, therefore, provides a high-frequency current generating circuit which can increase the amplitude of the high-frequency current superimposed on the control current of the laser diode and which generates less heat while suppressing power consumption.
|
