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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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