APD bias circuit with overcurrent protection

Abstract

The invention provides an APD bias circuit with overcurrent protection, which comprises an APD Bias chip circuit for outputting high voltage and an operational amplifier chip circuit for realizing amplification output of four circuits and with adjustable output, and is characterized in that the APD Bias chip circuit comprises an APD Bias chip, the operational amplifier chip circuit comprises an operational amplifier chip, and the operational amplifier chip circuit is connected with the APD Bias chip; wherein a voltage output port of the APD Bias chip is electrically connected with a power supply input port of the operational amplifier chip, four operational amplifiers are arranged in the operational amplifier chip, operational amplifier power supplies of the operational amplifiers are output voltage of the APD Bias chip, negative input ends of the operational amplifiers are grounded through a first resistor, and negative input ends of the operational amplifiers are grounded through a second resistor. The output port of the operational amplifier is electrically connected with the negative input end of the operational amplifier through a second resistor, and the positive input end ofthe operational amplifier is electrically connected with the controller through a third resistor. According to the invention, one APD Bias chip and one operational amplifier chip are adopted, the high-voltage power supply function which can only be completed by four traditional APD BIAS chips is realized; therefore, the performance is equivalent, the material cost is low, and the board distribution space is saved.

Description

technical field [0001] The invention relates to the field of power supply, in particular to an APD bias circuit with overcurrent protection. Background technique [0002] With the development of technology, the transmission rate of optical communication modules is getting higher and higher, and the transmission distance is getting longer and longer. Long-distance transmission requires the optical device at the receiving end to have high optical signal sensitivity. Almost every long-distance transmission optical module will use APD ROSA. This ROSA must be driven by high voltage, the low is more than ten volts, and the high is more than thirty volts. The traditional solution is completed by using four APD BIAS chips. High-voltage power supply function, but the cost of this solution is high and the layout space is wasted. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to overcome the defects of the prior art, and to provide an APD bias circuit wit...

AI Technical Summary

Problems solved by technology

Almost every optical module for long-distance transmission will use APD ROSA. This kind of ROSA must be driven by high voltage, which can be as low as a dozen volts or as high as 30 volts. The traditional solution is to use four APD BIAS chips to complete High-voltage power supply function, but the cost of this solution is high, and the layout space is wasted

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