To learn more about Zuken’s CR-8000 tools for high-speed design, visit our website and check out our e-training courses here.6.1.9 The pump suction- specific speed shall be calculated in accordance with Annex A and, if specified, limited as stated on the data sheet. Signal Speed and Propagation Delay in a PCB Transmission Line, Atar Mittal,
Keep this information in mind the next time you’re calculating trace lengths it should make the job a little easier for you. it predicts the general shape of a pump's impeller and is represented as N s (N sqrt (Q))/(H mano (3/4)) or Specific Speed of Centrifugal Pump (Angular velocity of centrifugal pump sqrt (Actual discharge at centrifugal pump outlet))/(Manometric Head of Centrifugal Pump. Note*: Different microstrip and stripline structures will affect the signal speed, but only slightly. The Specific Speed of Pump formula is defined as an index used to predict desired pump or turbine performance. Yet to calculate the odds of winning certain. To calculate the actual time in nanoseconds (ns) of a given timing: 2000 timing / ddrfreq. NS&I happily lists the chance of one bond winning a prize in a month (1 in 24,000) on its website. Question: What is the maximum skew of the trace length for all the signals?Īnswer: Max skew in time delay = +/-2.5% of the 833ps clock period = 20.825ps FR4 Er≈4, Er eff≈2.92 Using the specific speed formula, a turbine designed to deliver 100,000 horsepower (74,600 kilowatts) with a head of 40 feet (12.2 metres) operating at 72 revolutions per minute would have a specific speed of 226, suggesting a propeller or Kaplan turbine. In this example, the normal FR4 material with a dielectric constant of 4 is used on the PCB with a differential clock rate of 1.2GHz (i.e., 833ps clock period): All the signals of SDRAM are directly or indirectly referenced to the clock. In order to be compliant with the specification of JEDEC, the maximum skew among all the signals shall be less than +/-2.5% of the clock period driven by the memory controller. On PCB transmission lines, the propagation delay is given by: Case study In a vacuum or through the air, it equals 85 picoseconds/inch (ps/in).
The formulas for calculating the signal speed on a PCB are given below: There are two general PCB trace structures : stripline and microstrip. The transmission line structure also affects the signal speed. Vc = 3 x 10 8 M/sec = 186,000 miles/second = 11.8 inch/nanosecondĪ signal travels on a PCB transmission line at a slower speed, affected by the dielectric constant (Er) of the PCB material. Let me take you through the process… Calculating signal speedĪccording to physics, electromagnetic signals travel in a vacuum or through the air at the same speed as light, which is:
SPECIFIC SPEED NS CALCULATOR HOW TO
To manage the time delays, we need to know how to calculate trace length from time delay value in order to implement the PCB trace routing accordingly. One of the most challenging issues is managing the propagation delay and relative time delay mismatches.
SPECIFIC SPEED NS CALCULATOR DRIVER
To keep a good high-speed signal quality from driver to receiver on a PCB is not an easy task for designers.
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