A stipid question, yet need the and truely

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aq_mishu

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Guys,
I know it's totally a stupid question here...

I am generating a 50-50 duty pulse wave at 1MHz. Thus it will give me a 500KHz Oscillation. (that's what i want, a 500KHz carrier). Now, as I'm generating it from CMOS, the OSC is in the range of 0-5v. It's not AC type, instead a pulse only. To make it +/- voltage like OSC, i am planning to scale the 0 voltage to -5. Thus +/- 5V OSC. Any ideas??? [I'm using arduino].

Also, the other way is scale down the whole pulse to 2.5V, thus 0 will be -2.5, 2.5 will be 0 and 5 will be 2.5.

But still, I prefer the +/-5V option.
 

A 1MHz signal with a 50% duty cycle is 1MHz, not 500KHz. As is a 1MHz signal with 1% duty cycle.

As far as level shifting this thing, you could use a capacitor so that your signal will be centered around zero. You will also need an amplifier if you want +/- 5 volts out.
 

About the amplifier option, can you give an example?? so that I can work with it.
 

LMH6642, e.g.

Look at the manufacturers websites for high-speed opamps: TI, Linear, Analog Devices....

You could probably also do this with a couple of BJTs/MOSFETS
 

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