The Design And Implementation Of An Integrated Circuit Of Optocoupler

Optocoupler is a common electronic devices on the market, the application range of optocoupler is becoming more and more widely. As a research hotspot in the field of optoelectronics, optocoupler have made continuous progress of technology. Optocoupler product lines become greater than ever.Silicon integrated optocoupler with high integration, low cost, easy package and other characteristics is an important branch of optocoupler design. Monolithically integrated silicon optocoupler design difficulty lies in the process limits the design flexibility of the photodetector, photocurrent is mainly slow current, which limits the speed of photodetector. Photodetector using interdigitated structure, which improves the ratio of photo-generated “fast carriers”, to improve the speed of response of the detector. Due to a large parasitic capacitance of photodetectors, and photodetectors transimpedance amplifier is directly connected to the detector, so the main problem faced by the circuit design is how to increase the bandwidth of the transimpedance amplifier to increase the speed of the entire chip. In order to facilitate the testing, the paper specially designed test module.The main indicators of optocouplers include power, latency, transfer rate, and so on. The performance of optocouplers can be improved from both photodetectors and signal processing circuitry. Photodetectors designed by standard CMOS process, the whole design work is divided into two parts: the photoelectric detector design and the circuit part design. Firstly, introduced the development of photodetectors at home and abroad, and then introduced the optocoupler basic principle, followed the completed the design work and each photodetector and circuit module, Finally, completed the layout design and test of the chi, the test results show that the chip meets design specifications and successful completion of the design task.