Just select your preferences below, and start your free email subscriptions today. It is not necessary to power up the MAX9979EVKIT. We are, therefore, assured that we have a good, clean, valid output driven by a very clean and valid DATA1/NDATA1. The delay is approximately 2ns. Are you sure you want to Request Company Account? What product(s) will you be manufacturing with these Maxim parts? The second cursor shows 97.8Ω, and this is the impedance of the MAX9979's internal 100Ω resistor across DATA1/NDATA1 (see Figure 4). 06 27 12 10 36. What project(s) will these Maxim parts be used in? Step 1 - Delay at the NAND gate Lets look first at the propagation delay of the 74HCT00: the spec sheet says typical t=10ns, max t=25ns. Step 1. M1 is a mathematical calculation of the differential signals C1 - C2. Propagation Channel Models. Timely updates on new products, reference designs, design tools, technical articles and design resources. Propagation delays are short in simple circuits, but as the circuit becomes more complex, delays become extended. Typical propagation delay for category 5e UTP is a bit less than 5 nS per meter (worst case allowed is 5.7 nS/m). Impedance measurements ensure correct impedances for connectors and PCB runs. Jansweijer, H.Z. Channel models for 802.11™ WLAN Toolbox™ provides functions that let you model SISO and MIMO transmit-receive links with IEEE ® standard defined channel models. Our free samples program limits the quantities that we can provide to each customer per calendar year.If you feel that you have received this message in error, please contact samples-admin@maximintegrated.com. Step 1. Propagation delay is determined in an effort to avoid glitches in digital circuits. The output signal amplitude is now 0V to 1.5V. This article will demonstrate how to use TDR (time-domain reflectometery) measurements to minimize probing errors and improve the accuracy of propagation delay measurements. email@mycompany.com The delay measure… DELAY MEASUREMENT ECE 555/755-Cadence Tutorial Prepared by: Ranjith Kumar DELAY MEASUREMENT WITHOUT USING THE WAVEFORM CALCULATOR. Use the TDR pulldown menu to make the measurement. Ground the NDATA1 SMA connector with an SMA ground. City, State, Zip/Postal Excess capacitance and inductance in the signal path can be analyzed with the TDR signals, and then used as feedback to redesign the board if necessary. 196 0 obj <>stream To quickly measure this parameter, an arbitrary function generator can be used to stimulate the device input with a pulse signal, while measuring the device input and the output signal with an oscilloscope. We also expect this. Since DATA1 and NDATA1 are symmetrical and have identical lengths to the pins of the MAX9979, we will only measure the DATA1 PCB run. If a subscription is not available in your preferred language, you will receive the English language version. The cables are around 120 m and specified up to 1 GHz. The delay measured here is 804ps. h�b```e``z���� ��A��b�@̱XP ֯�M*�_"���sCOõ����u]�e+�:x8�x�}H�\p��p&W� E���,�}��Y�H.h5. But we still can measure this delay with the MAX9979 soldered in place. Because these cables will also be used to measure the signal's delay through the board, their delays cancel out. 0 These dips represent capacitances created by the board SMA and the DATA1 pin of the MAX9979. The Foresight Method. By the way, you keep posting flawed LTspice circuits, as in your previous thread. This emulates the TDR signal generated by the CSA8000. The trigger is the same, as in Step 4. The recovered clock at the slave node is used as the transmit clock of the slave so the complete system is synchronous. I recommend you write the delay below the gate. Here is how we can calculate the propagation delay from the trace length and vice versa: Where: V is the signal speed in the transmission line. The actual time measurement is the same in both configurations. Examining the capacitive dips reveals both where the SMA connector is soldered to the board, and where the dip of the MAX9979's DUT1 pin is. For example, if the source and destination are in the same building at the distance of 200 m, the propagation delay will be ∼ 1 μsec. τ it follows from (2) that τgr = τ. Question I have to measure the length of cables with a ZVL3 as accurately as possible. Please contact customer support. This is depicted in Figure 4. We expect this. This measurement was made with the MAX9979 soldered onto the board but with no power applied. The procedure to do the same is listed below. Propagation Delay & ExampleWatch more videos at https://www.tutorialspoint.com/videotutorials/index.htmLecture By: Ms. Gowthami … The setup for the CSA8000 remains as in Step 5. The rise and fall times are well within the specifications for the MAX9979. Measure the delay of a 2in SMA cable that attaches the DUT1 node to the CSA8000 vertical input (Figure 6). Use of good practices in measuring critical specifications. P. Jansweijer Nikhef Amsterdam Electronics-Technology October 15, 2009 2VLVnT-09 Athens Introduction yIt is feasible to measure propagation delay over an 8B/10B coded link over 100 Km of fibre yA 3.125 Gbps serial link implemented in FPGA provides a resolution of 320 ps. The scope is triggered, and all we want is one of these crossing points. The measurements are made between dips in the signal. 9 Measuring the Overdrive Voltage Curve ... How Comparator Topology Influences Propagation Delay 1 Abstract When using microprocessors, field-programmable gate arrays (FPGAs), or systems-on-a-chip (SOCs) there are power supply tolerances that must be met. TDR is normally used to measure the length vs. impedance changes along a signal path.
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