700MHz CMOS output to SINE convertion

[varaprasad]

Hi All,

We are trying to make 700MHz sine output from 700MHz CMOS output.We want make this in small package.Is it possible to convert 700MHz ( High Freq) signal in to sine by using simple LPF?Is there any method to convert this in to pure sine?

 

[karesz]

Hi,
I belief, that purest signal is to generate by an tuned Amp, or minimum a serial connected filter...
K.

 

[dick_freebird]

Umm... just about any bond wire at all ought to get you pretty
close, at that frequency. Hell, I've seen 80MHz 5mA outputs
not reach the flat-top with 10-15pF load. But there is no such
thing as pure - perhaps you ought to set a finite goal and
then you can begin to analyze your compliance to it.

 

[karesz]

Yes, most bondings are equal to ~150nH...
I thank the (seriel)filter on chip_of course, otherside I beliefe, that filtering at 700MHz is not so a big problem with clear layouting.
K.