Post subject: How can i convert square
wave to sinewave of same frequency?
Unread postPosted: Sun Mar
20, 2005 2:20 am
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.
Unread postPosted: Sun Mar 20, 2005 9:40
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.
Post subject: need the same help
as u need
Unread postPosted: Tue Apr 12, 2005 4:13 am
If u get pls forward to firstname.lastname@example.org..thanks..and
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.