Need a circuit or chip to do some magic

[djalli]

I have signals 1Volts p-p roughly with very low frequencies 0.5-5Hz. Can I convert them to square wave signals with the same frequency as original signal is.
example as:

-If signal is sinusoid 1volts p-p 2hz to make at ouput a square wave also 2hz in frequency ---or

-If signal is triangle 1.2volts p-p 1.5hz to make at ouput a square wave also 1.5hz in frequency

Can I make a circuit out of it or is any precision IC exactly for this purpose out there?

thousands of thanks to all of you

 

[bomba]

You can use comparator OP AMP configuration, with a reference equal to 1Vpp mean. If you want more stability you can use window comparator OP AMP configuration.

Best Regards

 

[djalli]

You can use comparator OP AMP configuration, with a reference equal to 1Vpp mean. If you want more stability you can use window comparator OP AMP configuration.

Best Regards

I tried several comparator configuration, circuitwise with op-amps. I mean it does works.
Since the op-amp used for the comparison is configured with no feedback (see figure I am attaching) the output will change to its maximum positive value for rising edges and change to its maximum negative value for falling edges.

There is one problem with this configuration. An input signal with low signal to noise ratio with these very low frequencies will
cause the comparator to falsely trigger on the noise present in the signal. I do not want that. That is why maybe some precise IC is out there.

thank you bomba

 

[djalli]

How can I improve it for low frequencies?

Below 1Hz as input signal I dont get what I want at Vout input for PIC chip.

Above that my extraction is precise in pulse width. I am including the 5Hz which works fine. 1.jpg is circuit itself. 2.jpg & 3.jpg are simulations.

Input maybe also triangular or any modulated waveform.

Give me sone hints. thank you all.

 

[linxf2003]

Is it possible to use hysterisis comparator to increase your SNR ?

 

[djalli]

Is it possible to use hysterisis comparator to increase your SNR ?

I tried. Output is in the middle as term of frequency. Thank you for the help. I am going to try incorporating phase lock loops. Any idea anyone how again to retain exact frequency this way?