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[SOLVED] How I get two precise phase-difference clock?

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rardongs

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Hi

I need to two clock(LO) for I, Q from one clock source (same freq. or higher)

they must have same precise phase-difference(90 degree) anytime.

how could i get?

plz give me the keyword to search.
 

Is the signal digital or analog?

Digital: Use a BUFD (if of clock period is small) else use DPLL circuit to get more flexibility

Analog: your talking about use a capacitive or inductive delay on one or the other to create a 90 phase lead or lag.

Keyword: digital (analog) phase delay circuit
 
Thanks kalyanasv!

I try that.

p.s.
Is it might work at 2.4 Ghz?
 

Use inverter to get precise 180 degree phase shift.
 

If you have a 2X input clock, I've done a quadrature static
divider using half-latches that worked pretty well (>1GHz in,
>500MHz out, 0.5um SOI @ 3.3V) as the clock recovery
phase-field generator for a burst-mode SERDES. The half-
latches (and all FFs) are bare-clocked with a 2-phase
(CK, CKb) clock input, the split pair is generated at the
ECL-compatible input buffer. So flipping clock phase is
just a pin swap. Each half-latch Q output is one of the
quadrature phases. The thing operates as a ring counter
with an inverter wrap.

No, I can't show you deep detail. We jus' po' sharecroppers.

I am sure that you could get a CML/SCL scheme to run above
2GHz. Bang-bang CMOS, that could be tricky.
 
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