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  1. #1
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    Phase Interpolator for high frequency circuit

    Why don't we generate Phase Interpolator using RC Delay ( LPF).
    Just by changing the R/C Value, delay can be generated and it can be go through a comparator or Strong ARM to get the suare wave with Delay based on digital code.

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  2. #2
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    Re: Phase Interpolator for high frequency circuit

    "We"? I've done it (decade or more ago, 800MHz PECL
    clock recovery). Made 8 phases from the single incoming,
    with the non-quadrature ones by interpolation as you
    say (comparator, forget it - inverters were all that could
    hang with that clock in 3.3V RF SOI CMOS).

    That said I'm not a fan of how the interpolated phases
    degrade edge rate (@ the RC and next stage), picking up
    more phase noise / jitter.



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