Techniques are provided for calibrating on-chip termination impedances on integrated circuits. An on-chip termination (OCT) calibration circuit generates calibration codes that selectively control the conductive states of a set of transistors coupled in parallel. The OCT calibration circuit selects a...http://www.google.com.tw/patents/US8004308?utm_source=gb-gplus-share專利 US8004308 - Techniques for providing calibrated on-chip termination impedance
