Electronics > Beginners

Sample Rate

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radiolistener:

--- Quote from: metrologist on September 03, 2019, 02:36:09 pm ---What if a sample is taken on both the rising and falling edge? I guess your 50 MHz sampling clock would produce a 100 MHz sample rate

--- End quote ---

if sample is taken on both rising and falling edge, then sample rate Sa/s and sample frequency Hz will be still equals.

For example if you use clock source 50 MHz and use rise and fall edges to produce samples, then you will get 100 MSa/s = 100 MHz = 100 M cycles per second sample rate. Nothing confusing :)

Sample rate means how many samples per second is produced. If you put strobe for each sample, you will get square wave with frequency which is exactly equals to sample count per second. And it doesn't matter what is source oscillator frequency.

macboy:

--- Quote from: radiolistener on September 03, 2019, 09:46:16 pm ---
--- Quote from: metrologist on September 03, 2019, 02:36:09 pm ---What if a sample is taken on both the rising and falling edge? I guess your 50 MHz sampling clock would produce a 100 MHz sample rate

--- End quote ---

if sample is taken on both rising and falling edge, then sample rate Sa/s and sample frequency Hz will be still equals.

For example if you use clock source 50 MHz and use rise and fall edges to produce samples, then you will get 100 MSa/s = 100 MHz = 100 M cycles per second sample rate. Nothing confusing :)

Sample rate means how many samples per second is produced. If you put strobe for each sample, you will get square wave with frequency which is exactly equals to sample count per second. And it doesn't matter what is source oscillator frequency.

--- End quote ---
I agree with radiolistener. No ambiguity exists unless the reader chooses to add unnecessary confusion to a simple topic. Sampling at 100 MHz means sampling at "100 Million per second" since the "Hz" unit is literally "per second". Whether or not a DDR clock is used internally is moot. I am absolutely certain that my oscilloscope, which can sample at 16 GHz real time, does not have any 16 GHz clock internally. It actually samples on multiple phases of a slower clock.

In other words: Hz, MHz, GHz, can specify rate of anything, not just a clock signal.

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