A kind of overvoltage protection device and method for cmos laser driver

Abstract

The invention relates to an overvoltage protection device for a complementary metal oxide semiconductor (CMOS) laser driver. The laser driver is controlled by a voltage of an input end and outputs an appropriate driving current to a laser, the overvoltage protection device is characterized in that sampling is performed from an output end of the laser driver, the voltage of the output end is adjusted according to a sampling signal, an output end of the overvoltage protection device is connected with the input end of the laser driver, the overvoltage protection device comprises a high-impedance module, an offset voltage generator and a summator, an input end of the high-impedance module is connected with the output end of the laser driver, an input end of the offset voltage generator is connected with an output end of the high-impedance module, and two input ends of the summator are respectively connected with the output end of the high-impedance module and an output end of the offset voltage generator to obtain an output voltage of the overvoltage protection device. The overvoltage protection device has the advantages of simple structure, low power consumption, low hardware cost and the like, and is easy to implement.

Description

technical field [0001] The invention relates to the technical field of laser driving in systems such as optical fiber communication, in particular to an overvoltage protection device and method for a CMOS laser driver. Background technique [0002] Traditional optical fiber communication systems include electro-optic converters, data transmitters, photoelectric converters, and data receivers. The transceiver chips are currently integrated using special processes such as GaAs, InP, or SiGe. These special processes are expensive and undoubtedly increase the overall optical power. Therefore, it is of great significance to develop low-cost optical communication transceivers. The cut-off frequency of modern deep submicron CMOS technology is constantly increasing, making it possible to design high-speed laser drivers based on CMOS technology. Since the deep submicron CMOS process improves the cut-off frequency by continuously reducing the channel length and gate oxide thickness, ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the reliability problem caused by gate-source or drain-source overvoltage of deep submicron CMOS laser drive devices, the present invention provides an overvoltage protection device and method for deep submicron CMOS laser drivers, through simple loop control To achieve effective control of the gate-source and drain-source voltage differences of CMOS devices to improve the reliability and stability of the circuit

Images