Is there any frequency divider which can divide the reference frequency by fractional multiples with 50% duty cycle for its output?

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Roman V. Ozhegov

What frequency range you need? MHz? GHz? If you need hundred MHz frequency refer to 74HC logic. In one of my projects I had used 74HC4040 for frequency divide.

Also you can use standard VCO from texas instruments (LMX25xx), analog devices or some company else. Main questions are next what frequency range you have, what frequency range you need and what is value of your frequency multiplier?

Dobromir Dobrev

Include :2 after arbitrary freq. Divider, the output will have 50% duty cycle

Please look to 74HC404.

Tomasz Starecki

This can be quite easily obtained with fractional division PLL solutions. See e.g. http://www.silabs.com/products/clocksoscillators/clock-generator/Pages/default.aspx