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 data-dependent 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 300 mV 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 mm(2); it was tested on a 55-in 3840 x 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.