Abstract
A new dual-loop adaptive continuous-time linear equalizer (CTLE) based on power comparison is proposed to realize a 25-Gb/s optical transmitter. The adaptive CTLE controls the high-frequency gain peaking of the loop regulation path to match the configuration of the boost factor for improved adaptive capacity and power comparison accuracy. A digital control method is used to operate two power comparison loops with different running cycles for increased power comparison accuracy and reduced power consumption of the adaptive control process. Measurements of an adaptive CTLE fabricated by the 0.18 μm SiGe BiCMOS process showed that it was able to compensate for the coaxial cables with an attenuation of at least −11.4 dB @12.5 GHz. The adaptive CTLE only consumed 22.8 mW from a 1.8-V power supply, resulting in energy efficiency at 0.91 pJ/b.
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