45 degree LO other than I/Q

Hey, guys,

I have a VCO running at twice speed of LO. After a divide-by-2, I get I/Q LO signals. Is there anyway I can generate another pair of clocks with 45 degree phase shift of I/Q, but still at half of VCO frequency?

Thanks a lot,

Kun

Sure, take a 45deg vco phase and divide it by two using a toggle flip flop.

well i think a Dll will do this, so a 4 delay cells VCDL and a PD should be good

First thing, if 45 degree vco phase, then you divide it by 2, what you get will be 22.5 degree phase shift, not 45 degree phase.

Second, if I don't have 45 degree vco phase, how can I do the job?

Thanks a lot