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Product Suggestion: High speed square wave generator with variable duty cycle

Hi:

As title, yes! it means a high frequency PWM controller.

My requirement:

(1) >400MHz clock @ 50% duty cycle

(2) and variable duty cycle between 10% ~ 100%

(3) if frequency also can be variable, that's perfect!

(4) I prefer to easy peripheral circuit, e.g. VCC/GND, XTAL I/O, PWM out, and VR to control duty cycle

I've surveyed timers class, but none of them met my requirements.

Does anyone give me suggestions?