Laser diode driver
AssigneeNEC Electronics Corporation
InventorMakoto Sakaguchi
Life of this patent
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Abstract
There is provided a current switching circuit that adds additional current in accordance with an intensity of output current to input current of a current mirror at a rising edge of the output current of the current mirror. The current switching circuit includes a MOS transistor outputting the additional current upon receiving ON potential at a gate terminal, and a slope of a leading edge waveform of a pulse signal providing the ON potential is controlled in accordance with the intensity of the output current.
Claims12
A current switching circuit that adds additional current in accordance with an intensity of output current to input current of a current mirror at a rising edge of the output current of the current mirror, comprising:
- a MOS transistor outputting the additional current upon receiving ON potential at a gate terminal, a slope of a leading edge waveform of a pulse signal providing the ON potential being controlled in accordance with the intensity of the output current.
A current switching circuit comprising:
- a first current mirror outputting second current proportional to input first current;
- a variable current source generating the first current;
- a current energized circuit generating third current to be added to the first current at the rising edge of the second current, in accordance with an intensity of the second current, the current energized circuit including:
- a MOS transistor outputting the third current;
- and
- a controller controlling a slope of a leading edge waveform of a pulse signal providing ON potential to be supplied to a gate terminal of the MOS transistor, in accordance with the intensity of the second current at the rising edge of the second current.
A current switching circuit comprising:
- a first current mirror outputting second current proportional to input first current;
- a variable current source generating the first current;
- a MOS transistor outputting third current to be added to the first current at the rising edge of the second current, in accordance with an intensity of the second current, the third current;
- and
- a controller controlling a slope of a leading edge waveform of a pulse signal providing ON potential to be supplied to a gate terminal of the MOS transistor in accordance with the intensity of the second current at the rising edge of the second current.
Dependencies are inferred from the claim text.