A 5.2 Gb/s Receiver for Next-Generation 8K Displays in 180 nm CMOS Process

This article presents a high-speed receiver for next-generation 8K ultra-high-definition TVs. The receiver supports error-free communication between the timing controller and the display driver integrated circuits (DDIs) across various channels. Because the receiver must be co-integrated with pixel drivers in the DDI, it must be implemented in a process with high-voltage devices, which poses significant challenges in achieving beyond 5-Gb/s operation. We propose techniques for overcoming such process-induced speed limitations. They include a level-shifting passive continuous-time linear equalizer (CTLE), an active CTLE with extended bandwidth using a negative capacitor, a speculative decision feedback equalizer with a down-sampled edge-sampling path, and a low-dropout regulator with parallel error amplifiers to achieve all-band power supply rejection. A reference-less clock and data recovery circuit with a new frequency detector is also described. Fabricated in a 180-nm CMOS process, the prototype receiver operates at 5.2 Gb/s and can compensate up to 29-dB channel loss while consuming 120 mA from a 1.8-V supply.