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(another) Pulse generator with Si5351

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stcoso:
Hi! I'm trying to design a pulse generator.
I need  adjustable 1-10 ns  pulse with adjustable frequency (ideally 10kHz/50MHz).
Si5351 has 3/8 clock outputs with adjustable 333ps/step phase offset. So I'm thinking to generate 2 clock signal ( same frequency but out of phase) and feed them into a fast comparator (with reasonable rise/fall) to obtain the pulse that I need.

Where am I wrong?

radiolistener:
si5351 already has 1 ns rise/fall time. So, there is no need for comparator, you can use it's output directly.

stcoso:
Ok... but it's 1ns 20/80% and that wouldn't allow 1ns pulse width

radiolistener:

--- Quote from: stcoso on February 20, 2020, 03:31:50 pm ---Ok... but it's 1ns 20/80% and that wouldn't allow 1ns pulse width

--- End quote ---

1 ns pulse width is 500 MHz. But you're mention that you're needs 10kHz...50MHz frequency with 1..10 ns rise time. si5351 allows to produce 5 kHz...200 MHz with rise time 1 ns. Which ideally fits your requirements, isn't it?

stcoso:
1 to 10 ns pulse width. Rise/fall need to be good enough to get 1ns pulse with decent shape (this signal will be fed into a gan driver). For a 1-ns pulse width 1ns rise/fall time are clearly not enough. Also,  si5351 has fixed duty cycle and is limited to 200MHz so can't use this directly to generate 1ns pulse width.
 I'm wondering if there is a clever way to achieve what I need.
I could also use a AND gate with the clock signals from the si5351 shifted (starting from 180°) to achieve overlap.

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