Design of PAM-4 and 10-Gb/s Common Cathode Laser Diode Driver Integrated Circuits
碩士 === 國立高雄應用科技大學 === 電子工程系碩士班 === 102 === In this thesis, two optical transmitter circuits are designed for optical communication systems, and their output current signals use the different modulation methods. Those circuits were designed and simulated in TSMC 0.18μm CMOS process technology. The f...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2014
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| Online Access: | http://ndltd.ncl.edu.tw/handle/37414826935159468749 |
| Summary: | 碩士 === 國立高雄應用科技大學 === 電子工程系碩士班 === 102 === In this thesis, two optical transmitter circuits are designed for optical communication systems, and their output current signals use the different modulation methods. Those circuits were designed and simulated in TSMC 0.18μm CMOS process technology.
The first laser diode driver(LDD) was designed using common cathode for reducing noise interference and signal distortion. The LDD used the capacitively couple current amplifier(C3A) to improve the switching time of LDD. The LDD can be operated at 10-Gb/s non-return zero(NRZ) data; its modulation current can be adjusted from 2 to 13 mA. The LDD suits for OC-192 system or 10-Gb Ethernet.
The second LDD was designed for four-level pulse amplitude modulation(PAM-4) to reduce the required circuit bandwidth and easy design of high-speed circuits. The LDD can transmit 5-Gb/s data; its total
modulation current can be adjusted from 0 to 9 mA; and its bias current can be set from 0 to 10 mA. Using the same PAM-4 decode receiver circuit, the LDD can be applied in high-speed optical fiber transmission
interface.
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