01 Structure of SIB SIB (Segment Insertion Bit) is a fundamental unit of the IEEE 1687 standard specification. Utilizing the characteristics of SIB circuitry, we can achieve plug-and-play and flexible configuration of the IJTAG network. Essentially, SIB is a single-bit TDR. By controlling the two states of SIB being on and off, we can connect … Read more
Welcome FPGA engineers to join the official WeChat technical group. Clickthe blue textto follow us at FPGA Home – the largest and best FPGA pure engineer community in China. Introduction: Transmission lines define and control characteristic impedance along their length. However, the three-dimensional structure at their interfaces does not have easily defined or constant impedance … Read more
“In the field of signal integrity, TDR testing and impedance matching are core technologies to ensure the reliability of high-speed circuits, and the two are closely related and indispensable.” 01 Impedance Matching — Reflection Coefficient: As shown in the figure below, when an incident signal is transmitted to a transmission line, it propagates towards the … Read more
01 What made me curious about passive probes It all started with a question: can a 1X passive probe be used to match a 50-ohm or 75-ohm system like a coaxial cable? Experienced individuals would immediately say no, because even a 1X probe has a significant resistor in series. I happened to have a broken … Read more