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Copyright: 1996 - 2024
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    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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How can i convert square wave to sinewave of same frequency? - RF Cafe Forums

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khalil_cse@yahoo.com
Post subject: How can i convert square wave to sinewave of same frequency?
Unread postPosted: Sun Mar 20, 2005 2:20 am

Hi
Anybody can help me to design a circuit to convert square wave to sine wave of same frequency to build local oscillator for radio card.
khalil


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Guest
Post subject:
Unread postPosted: Sun Mar 20, 2005 9:40 am

If you perform a Fourier Series of a square wave you will see that it is made up of multiple frequencies, in particular, high frequency components. Therfore, to convert a square wave to a sine wave, you simply filter out the higher order components by using a low pass filter that will pass the frequency of the square wave (1/period) and reject the higher order components.


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chaitanya
Post subject: need the same help as u need
Unread postPosted: Tue Apr 12, 2005 4:13 am

If u get pls forward to saichaitanya@indiatimes.com..thanks..and pls


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Guest
Post subject: Square to Sine for LO
Unread postPosted: Mon Apr 18, 2005 10:07 pm

Actually, most of the time you want your mixer to act as a switch, rather than as a linear multiplier. This is the reason for running standard diode double balanced mixers at the rated power (+7/17/27dBm) - to get good switching action. This gives you better 3rd order intercept performance, for example.

What frequency range are you looking at? A low pass filter only works if you have somewhat less than a 3:1 frequency range. People have used tunable bandpass filters (such as those made by Pole-Zero Corp) to cover wider ranges.

Good Luck!





Posted  11/12/2012
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