An HDMI Cable Equalizer With Self-Generated Energy Ratio Adaptation Scheme

This brief presents an adaptive equalizer for high-definition-multimedia-interface (HDMI) systems with a new adaptation scheme by comparing the energy ratio in high-frequency and low-frequency bands of the equalized signal with a self-generated energy ratio. The self-generated energy ratio tracks process, voltage, and temperature variations to overcome the problem with preset energy ratio adaptation. Fabricated in 0.5- mum SiGe BiCMOS technology, the adaptive equalizer occupies 0.25 mm² and consumes 108 mW from 3.3-V voltage supply at 2.25-Gb/s data rate. Measurement results show that it can automatically adapt to up to 10-m HDMI cables, achieving 0.1-UI peak-to-peak jitter in equalized signals.