A 2.1-Gb/s 12-Channel Transmitter With Phase Emphasis Embedded Serializer for 55-in UHD Intra-Panel Interface

Phase and amplitude emphasis are combined in a 2.1-Gb/s 12-channel transmitter for ultra-high definition (UHD) intra-panel interface. The transmitter performs phase emphasis within the final 2:1 stage of its 20:1 serializer. This reduces datadependent jitter (DDJ) without increasing IO capacitance by making the timing of bit transitions depend on the previous data. We have also proved the compensation effect of this emphasis by a mathematical analysis. The low-voltage differential signaling (LVDS) driver in the transmitter can accommodate a 300mV variation in common-mode voltage and swings of 300 mV-1.2 V in the output signal, so as to match the variations between channel characteristics which occur in large displays. A prototype was fabricated in 28-nm CMOS, and occupies 1.35 mm²; it was tested on a 55-in 3840 × 2160 thin-film transistor liquid-crystal display (TFT-LCD) intra-panel interface, where it compensated for channel losses exceeding 10 dB, while reducing eye jitter by 38%: phase emphasis is responsible for about half of this reduction.