Need input amplifier design for frequency meter

[Rockzinstruz]

Hi ...

I am measuring the unknown frequency of sine and triangular wave using 8051 based frequency meter.for that I have to give the input 5V square wave with only positive half cycle as the input of the microcontroller. Suppose I wants to measure and display the unknown frequency of sine /triangular means,i have to convert the these waves as the square wave.
Which input amplifier circuit is suitable for this conversion?
please suggest your ideas...


Thanks.

 

[ericgibbs]

hi,
You could use a high speed comparator to give a square wave output for a sinewave wave input.

Is this for the 3MHz OPA in your other thread.?

 

[Rockzinstruz]

No...my another thread for increasing the amplitude aspect.This one for measuring the frequency of sine and triangular wave form 1Hz to 3MHz with 2Vp-p

 

[ericgibbs]

No...my another thread for increasing the amplitude aspect.This one for measuring the frequency of sine and triangular wave form 1Hz to 3MHz with 2Vp-p

hi,
I think my question was not clear,, is this squaring circuit for the 3MHz project.?

I believe your reply is yes, so thats why I suggested a 'high speed' comparator.

So your signal inputs will be triangular or sine, do they both swing thru zero volts.? [ie: no offset]

EDIT:
A LT1712 comparator would be suitable.

 

[Rockzinstruz]

Ok..Thanks for your replies.