SMU-6556 - how to control the rise in digital lines (hsdio) time
Hello
Is it possible to control the rise in digital lines SMU-6556 time?
Even in a low frequency 10 kHz signal rise time is 2ns.
TKS,
Hello engfpe,
The SMU-6556 is a 50 Ohm system, which means that the output is source series finished to be 50 Ohms and all our cables and accessories are 50 Ohms. With this configuration, regardless of the flow of data, you should have a clean edge up or down, regardless of the data rate. The quality of the production (edge up or down) on your device is related to the adaptation of impedance of your cables.
The SMU-6556 cannot adjust the speed of scanning by itself. However, you can insert simple passive components to do it for you. I have attached below the images. The first is a diagram showing a way to slow down the edge. The second is the a waveform simulation showing the rate of original edge before it slows down and the edge of idle. This simulation is not the SMU-6556 but rather a generic digital output for concept. In the schema that R1 is set on 34 Ohms because U1.8 has the 16 additional Ohms on the inside. TL1 is the output of 50 ohms simulating the cable on the SMU-6556. R2, R3, and C1 are components, you can insert after the SMU-6556 twist before moving your device/cable. In this configuration from cable to your device is TL2 which is also 50 ohm, but it could be another impedance in which case you would change R3 to match.
You can see in the attached images, you can slow down significantly the edge with this configuration by altering the C1. I hope this helps.
Tags: NI Hardware
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