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Comparator for restoring 27MHz clock from sine signal.

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Esmund:
Hello,

I'm looking for comparator that allowes me to restore 27MHz clock from sinusoidal waveform ( min. 100mVpp ). I'm struggling with finding one because it's low power solution, so maximum quiescent current suppose to be around 1mA, and minimum supply voltage around 2V7 / 3V0. Are you familiar with any solution that meets the requirements? Thank you for any help.

Best regards,

Esmund :)

Benta:
With those requirements, it might be easier to build a discrete amplifier/clipper.

OwO:
PL133-37 at 2.5V seems to meet those specs

DaJMasta:
I assume this is a sine centered around zero?  Well if it's just a sine, you already have your clock, you just have to make it usable by digital circuits, so:

signal -> DC blocking cap -> resistor divider to bias the signal to remain positive -> schmitt trigger/transistor amplifier/fast comparator -> regular, sharp edged digital clock signal


Since you already have the signal in a clean state, the basic approach, as mentioned in the second post, is to amplify it - this will get you a more-square edge in the voltage range of interest, but then clip off the top and bottom.


Worth mentioning, a pure sine wave is generally the clock of choice at high frequencies, and is sometimes most of what is manageable when the parasitics start rounding the edges of your square wave.

LapTop006:

--- Quote from: Esmund on February 13, 2019, 03:16:36 pm ---I'm looking for comparator that allowes me to restore 27MHz clock from sinusoidal waveform ( min. 100mVpp ). I'm struggling with finding one because it's low power solution, so maximum quiescent current suppose to be around 1mA, and minimum supply voltage around 2V7 / 3V0. Are you familiar with any solution that meets the requirements? Thank you for any help.

--- End quote ---

For this purpose I quite like the Linear Tech LTC6957, although it (the CMOS output version at least) uses ~20x more power than you want.

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