DC-coupled laser diode driver circuit with large modulation current

Abstract

A DC-coupled laser driver circuit with large modulation current belongs to the optical field. The present invention solves the problem that the conventional laser driver circuit consumes too much voltage margin because the transistor is used as the tail current source, resulting in a small modulation current. The present invention includes a negative feedback unit, an adaptive drive unit, a mirrored tail current source, a resistor R11, a resistor R12, a bias current source IBIAS and a diode D2; The resistor R12, laser D1, resistor R11, and bias current source IBIAS are connected in series between the voltage VCC and the ground in sequence; the input terminal of the negative feedback unit is connected to the data signal input ports TINP and TINN, the output terminal of the negative feedback unit is connected to the input terminal of the adaptive drive unit, the output terminal of the adaptive drive unit is connected to the control signal input terminal of the mirrored tail current source, a drive signal output terminal of the mirrored tail current source is connected to the anode of the laser D1 through a diode D2, the other drive signal output terminal of the mirrored tail current source is connected to the cathode of the laser D1.

Dependencies are inferred from the claim text.