A HDMI Transmitter with Adaptive Pre-emphasis for Different Cable Length

本篇論文設計了一個具有適應性補償功能的HDMI傳輸器，可針對不同長度的HDMI纜線利用時域反射原理進行長度偵測，並自動優化HDMI傳輸器的補償係數以提升在傳輸端對傳輸信號的補償功能。此HDMI傳輸器可應用於1.5公尺、3公尺以及5公尺的HDMI纜線傳輸，並使接收兩端的傳輸信號符合HDMI 1.4版規格。使用者可以自由切換不同長度的HDMI纜線進行傳輸，而無須擔心因更換HDMI纜線造成傳輸器補償失當的問題。除此之外，此HDMI傳輸器還採用了電壓模式的前饋型等化器架構，不同於傳統的高功耗電流模式傳輸器。電壓模式架構有效地降低了傳輸器在傳輸信號時的消耗功率，前饋型等化器電路更能有效率地將傳輸速度提高至3.6Gbps。此HDMI傳輸器結合兩者的優點，使其在與一般傳統的傳輸器比較時，能達到更低的功耗以及更快的速度。In this thesis, a HDMI transmitter with adaptive compensative function was developed. The HDMI transmitter uses the TDR theorem to detect the length of different HDMI cables, and automatically optimizes the compensation coefficients of the HDMI transmitter to enhance the compensation function on the transmitter side. The HDMI transmitter can be applied to 1.5 meter, 3 meter, and 5 meter HDMI cables for transmission, and fully complied with the HDMI 1.4 specification. Users can freely switch different lengths of HDMI cables for transmission, without worrying about the transmitter compensation misconduct, which is caused by replacing different lengths of HDMI cables. In addition, different from the traditional current mode transmitter, the HDMI transmitter utilizes voltage mode feed-forward equalizer. Voltage mode architecture effectively reduces power consumption of signal transmission, and feed-forward equalizer successfully enhances transmission speed up to 3.6Gbps. The HDMI transmitter combines with the advantages of both. Compared with traditional transmitters, the HDMI transmitter has lower power consumption and faster transmission speed