Laser diode control circuit loop

Abstract

A laser diode control circuit loop comprises a reference circuit with a programmable reference current, a first endpoint thereof providing a first voltage and a second endpoint thereof providing a second voltage, according as the reference current passing through the first endpoint and the second endpoint; and a driving circuit, a third endpoint thereof connected to the first endpoint of the reference circuit, a fourth thereof connected to the second endpoint of the reference circuit, a output end thereof providing a driving voltage and an output current, and the reference current of the reference circuit and the output current of the driving circuit are as direct ratio. With regard to the operation field of the laser diode driving circuit, the operation limitation within low voltage can be got over, according as the output current from the reference current matching.

Description

Technical field [0001] The present invention relates to a laser diode control loop, especially a high-speed and low-voltage laser diode control loop. Through this, the output current can be obtained according to the reference current matching, so that the working range of the laser diode driving circuit can overcome Limitations of low voltage operation. Background technique [0002] With the rapid development of the electronic industry, the performance requirements of electronic products are getting higher and higher, and the functions of the products are diversified, and the circuit design is becoming more and more complicated. When a sophisticated circuit is operated at a high supply voltage, it will not only cause high power consumption of the circuit and affect the response time of the circuit, but also reduce the yield of the circuit semiconductor manufacturing process. [0003] Generally, the output driving voltage of the existing laser diode driving circuit must be operate...

AI Technical Summary

Problems solved by technology

Obviously, the supply voltage 12 is insufficient, which will make the driving circuit 10 of the laser diode unable to work normally

[0008] Low power consumption circuit design is currently the mainstream product. The supply voltage 12 of many electronic products is designed from the previous high voltage (example: 5V), and gradually uses low voltage (example: 3.3V) to supply its operating voltage, so use The driving circuit 10 of the existing high voltage laser diode will not be able to meet the needs of today's circuit design

[0009] For this reason, how to design a control circuit of a laser diode with high-speed operation and low supply voltage for the above-mentioned shortcomings of using a high-voltage operation for the driving circuit of the existing laser diode, this is the key point of the present invention

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