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LED drive circuit and light transmission module therewith

A technology of light-emitting diodes and driving circuits, which is applied in the field of optical transmission modules, can solve problems such as difficulty in working at very high speeds, and achieve the effects of shortening the leading time and suppressing the narrowing of the optical pulse width

Inactive Publication Date: 2002-05-01
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that it is difficult to perform very high-speed operation

Method used

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  • LED drive circuit and light transmission module therewith
  • LED drive circuit and light transmission module therewith
  • LED drive circuit and light transmission module therewith

Examples

Experimental program
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Effect test

Embodiment Construction

[0030] Next, we describe the embodiment of the present invention with reference to the figures.

[0031] 1st embodiment

[0032] figure 1 A light emitting diode drive circuit according to the first embodiment of the present invention is shown. Such as figure 1 As shown, the input terminals of the pulse current generating circuit (3) and the pulse shaping circuit (16) are connected to the input terminal (32), and the input ends of the first current switch circuit (2) and the discharge circuit (5) are connected to the pulse shaping circuit (16) output connection. The anode and cathode of the LED (1) are connected to the output end of the discharge circuit (5), and the output ends of the pulse current generating circuit (3) and the first current switch circuit (2) are connected to the cathode of the LED (1). Thus, the first current switch circuit (2) is connected in series with the ELD (1), the discharge circuit (5) is connected in parallel with the LED (1), and the pulse c...

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PUM

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Abstract

A light-emitting diode driving circuit according to an embodiment of this invention includes a light-emitting diode (1), a first current switch circuit (2) connected in series with the light-emitting diode (1), the first current switch circuit (2) turning on / off a current in accordance with an external input signal input from an input terminal (32), a pulse current generating circuit (3) connected in parallel with the first current switch circuit (2), the pulse current generating circuit (3) supplying a pulse current including a pulse width smaller than the pulse width of the external input signal and shaping a leading edge portion of an optical waveform output from the light-emitting diode (1) into a desired optical waveform, and a discharge circuit (5) connected in parallel with the light-emitting diode (1), the discharge circuit (5) quickly discharging charge stored in the light-emitting diode (1) when the current to the first current switch circuit (2) is turned off.

Description

technical field [0001] The present invention relates to a light-emitting diode (LED) drive circuit and an optical transmission module using it, in particular to its use in a high-speed optical transmission module or an optical transceiver. Background technique [0002] Existing light-emitting diode (LED) drive circuits that increase the speed of light output waveforms, as disclosed in Japanese Patent Publication No. 7-74788 "High-Speed ​​Optical Transmission Circuit" published in 2017, have a speed-up circuit using a trailing edge time , to further peak the front part. [0003] Figure 6 Shows a light emitting diode drive circuit according to the prior art. Such as Figure 6 As shown, the first current switch circuit (33), the input end of the buffer amplifier (34) and the inverter circuit (35) are connected with the input terminal (32). The first capacitor (36) is connected to the output terminal of the buffer amplifier (34), and the second current switch circuit (38) is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/00H04B10/25H04B10/2507H04B10/40H04B10/50H04B10/58H04B10/60
CPCH04B10/508H04B10/502H04B10/50H04B10/40H04B10/00
Inventor 佐仓成之上西克二
Owner KK TOSHIBA
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