Laser diode driver damping circuit

摘要

A damping circuit having an input terminal and an output terminal is described. The damping circuit comprises a driver having an input and an output; an RC circuit coupled between the input terminal and the output; and a resistor coupled between the output and the output terminal, wherein the RC circuit delays passing a signal from the output terminal to the input terminal and a low impedance associated with the driver generally reduces ringing.

主权项

1. A damping circuit having an input terminal and an output terminal, the damping circuit comprising:
a current source having a first current; a first current mirror coupled to the current source, the first current mirror having an associated current approximately equal to the first current; a plurality of slave devices coupled to the compensated current mirror, the slave devices having an associated current approximately equal to a scaled version of the first current; a second current mirror coupled to the current source and the first current mirror, the second current mirror having an associated current approximately equal the first current; a driver having first and second driver inputs and a driver output; a first resistor circuit coupled between the driver inputs; a capacitor coupled between the first input and a low voltage supply; and a second resistor coupled between the driver output and the output terminal; wherein the first resistor and the capacitor delay passing a signal from the output terminal to the input terminal and a low impedance associated with the driver generally reduces ringing.