| Products > Test Equipment |
| FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator |
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| pantelei4:
--- Quote from: radiolistener on August 22, 2019, 06:03:36 pm ---Also, as you can see, even with 50 Ohm input there is some small impedance mismatch. --- End quote --- This is not related to the number and level of steps. The level of quantization remains the same, and if it can be seen, this is enough. |
| radiolistener:
--- Quote from: pantelei4 on August 22, 2019, 06:31:19 pm ---This is not related to the number and level of steps. The level of quantization remains the same, and if it can be seen, this is enough. --- End quote --- DAC works at 250 MHz, so there is about 1-2 ns rise time transition between two levels. Are you sure that you can measure voltage difference on this transition with no proper termination at the end of cable? |
| pantelei4:
--- Quote from: radiolistener on August 22, 2019, 06:45:28 pm ---DAC works at 250 MHz, so there is about 1-2 ns rise time transition between two levels. Are you sure that you can measure voltage difference on this transition with no proper termination at the end of cable? --- End quote --- In order to see, a low frequency is selected, for example 1 kHz or even lower. The quantization level is a constant voltage signal, the RF bandwidth does not matter. |
| radiolistener:
pantelei4, but these quantization levels are changed with rise time about 1-2 ns. It doesn't depends what frequency you selected, because DAC sample rate is fixed at 250 MHz. With any output frequency, transition between two quantization levels will occurs with fixed interval 4 ns and with fast rise time. With low frequency you will get longer interval between changes. But how you know if this interval is one step 100 ns or 4 steps 25 ns? Since your cable doesn't have proper termination, short intervals may be overlapped with ringing in the cable and you will not be able to recognize short steps. |
| pantelei4:
--- Quote from: radiolistener on August 22, 2019, 07:06:04 pm --- Since your cable doesn't have proper termination, short intervals may be overlapped with ringing in the cable and you will not be able to recognize short steps. --- End quote --- The steps will be long. |
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