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N5465A Datasheet(PDF) 7 Page - Keysight Technologies |
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N5465A Datasheet(HTML) 7 Page - Keysight Technologies |
7 / 11 page 07 | Keysight | N5465A InfiniiSim Waveform Transformation Toolset for Infiniium Oscilloscopes - Data Sheet Measurement and simulation circuits The core of the InfiniiSim waveform transformation software is in defining two circuits: one that defines your measurement setup and the other to define what you desire to have as your measurement. The first we call the ‘measurement circuit’ and the second is the ‘simulation circuit’. These can be as simple as one block between the source and the oscilloscope load, or as complex as nine circuit blocks as in general purpose model. The simulation and measurement circuits share the topology selected, however, in many cases, circuit definitions for each block will be very different from measurement to simulation. This leads to great flexibility in transforming acquisitions at a measurement point to any other virtually probed location. For the circuit shown in Figure 6, for instance, Block `P’ has an S parameter file describing its loading during measurement, however, for simulation, the loading is desired to be eliminated, thus the `open’ designation. See what you deserve to see With the InfiniiSim waveform transformation toolset, you can see transformed signals in confidence whether channel elements are being inserted removed or whether the measurement plane is being relocated. Figure 7 shows a waveform of a digital signal at 1.8 Gb/s going through a combination of fixture and cable. Note that for the longer sequences of identical digits the waveform reaches a level that is very different from when the data changes frequently. This is called ISI and is seen when the channel exhibits low pass filter characteristics. The fixture and cables were measured with a 4-port Vector Network Analyzer and removed using the channel element removal selection in InfiniiSim. The yellow CH1 trace in Figure 7 depicts the results. Note the blue waveform depicting the ‘before measurement’ directly at the transmitter versus the yellow waveform transformed using the 4-port channel model of the fixture. Figure 7. De-embedded, yellow, channel 1 waveform along with original channel 3 waveform. Figure 6. Measurement and Simulation circuits. Blue designates the measurement circuit elements while the brown labeling designates the simulation circuit elements. Model your System as Detailed as you Need (Continued) |
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