25-Gb/s Optical Transceiver System
25-Gb/s Optical Transceiver System
25-Gb/s Optical Transceiver System
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Low-power TDC designabPFDArbiterdelaydelayDirection1bitMUXstartstopDLL1GHz clkDLL128 Vernier delay lines& SamplerDecoderOutput 7bitabPFDArbiterdelaydelayDirection1bitMUXstartstopDFF1GHz clkDFF1nsDLLslowDFFDLLfast128 Vernier delay lines& SamplerDecoderOutput 7bit300umDLLsSampler&Delaylines270umDecoderLow-power DLL TDC- 3.9ps resolution- ±500ps input range- Power : 4.6mW- Area : 270um x 300umConventional DLL TDC- 3.9ps resolution- ±500ps input range- Power : 10.4mW- Area : 270um x 300um2