| Summary: | 碩士 === 國立暨南國際大學 === 電機工程學系 === 92 === ABSTRACT
Providing high speed, wide bandwidth, and low loss communication environment, optical fiber communication plays an important role of high-speed data transmission in recent years. To implement optical communication system, the laser diode driver and the frequency synthesizer are critical components. The laser diode driver with low power concussion improves the transmission efficiency, and the frequency synthesizer providing a stable frequency clock enhances the quality of the optical communication system,
Up to the present, most laser diode drivers use the technique of differential current switch to drive the laser diode. That advantages the jitter suppression to output current. However, the tail current source of the differential amplifier keeps flowing, no matter the input data equals “1” or “0”. It wastes power greatly.
In this thesis, a 1.25Gbps laser diode driver with Auto Power Control and a frequency synthesizer using a fast-locked PLL are designed and implemented by TSMC 0.35μm 2P4M process. The laser diode driver uses single current source to drive the laser diode and saves half the power compared to the traditional laser diode driver. The fast-locked PLL uses fine-tuning and coarse-tuning to speed up the locking time.
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