CHip for zero cross detector

[suribright]

Hi I need to convert sine signal (>10Mhz ) to DC and would like to use CMOS opamp. Anyone know a CHIP (high speed conversion zero cross detector), please help! Chip work in range 0-5V only. I am getting difficult to find a chip. Thanks

 

[neddie]

Sounds like you are looking for an active rectifier cct , not a zero crossing detector?
Am I right?

 

[suribright]

No I need to zero crossing detector with reference is 0 - 1V. Input is sinewave but output is square waves. If active rectifier can do that it will be fine too. Please give me your cct. Tks

 

[neddie]

I don't have a cct off hand , was just a little confused by your post. " convert sine signal (>10Mhz ) to DC " , sounds like a rectifier to me :0)

 

[myfaithnka]

hi,
i think this one solves your requirement.

**broken link removed**

please run a simulation.

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hi,
i think this one solves your requirement.

http://www.engineering.uiowa.edu/sites/default/files/ees/files/NI/pdfs/01/27/DS012711.pdf

please run a simulation.

 

[suribright]

Hi myfaithnka, I sound like the one. I will try to simulate first and get back to you soon. @neddie: I think rectifier is ok too. If you have that cct please let me know.

 

[suribright]

Hi myfaithnka. I have tried to run with single 5V and it did not work. Do you have any recommend? Tks

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here is the circuit

 

[suribright]

Hi, anyone know the answer please. I have tried to simulate circuit above but did not work. @ myfaithnka: your chip is not work at single 5V.

 

[crutschow]

If you Google "high speed comparator" you will get a number of hits. I suggest you read this to understand some of the problems that can occur at such high frequencies.