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Design >> RF Design >> divide by 2.5
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Message started by nxing on May 27^th, 2008, 2:45pm

Title: divide by 2.5
Post by nxing on May 27^th, 2008, 2:45pm

Hi,

I need to design a divider to divide the signal by 2.5 ( the input signals are at around 4GHz), I would prefer the injection lock divider. Does anybody have any idea how to design that? or can refer to any papers regarding this matter?

Thanks

Norman

Title: Re: divide by 2.5
Post by Zero on May 30^th, 2008, 4:16am

Hi,

As far as I know, the injection locked dividers operate as integer dividers (you simply synchronize the nth harmonic of the oscillator to the input signal). However, to make such fractional divider, ÷2.5, you can multiply by 2, then divide by 5; one way to do that is to make a divide by 5 using flip-flops working on both clock edges. That would be possible at the GHz range if you are using a fast process. The alternative might be using an injection locked multiply-by-2 followed by an injection locked divide-by-5!