Hi. I cannot understand the I&Q Modulator...

I am reading this one of mini circuits..http://217.34.103.131/pdfs/ZFMIQ-10M.pdf

It has I and Q inputs...and it write (DC to 2MHz) freq for the input..

1)is the I and Q analog signals or bit stream ?If is a bit stream how can it has 2MHz frequency?

2)The I&Q Modulators as i understand make QPSK/8QAM/16QAM etc modulation..so the message I and Q must be bit streams (symbols basic) and carrier analog signal..right?

3)The output of a I&Q Modulator is exactly like the output of a AM-Modulator (?)...USB, LSB , carrier...what is going on here?

George

 

You might want to read this blog post that I write which gives a little background on IQ signals.
http://www.tek.com/blog/what’s-your-iq-–-about-quadrature-signals…

 

You might want to read this blog post that I write which gives a little background on IQ signals.
http://www.tek.com/blog/what’s-your-iq-–-about-quadrature-signals…

i have already read this article.it is very understood.many thanks

 

The discussion is older. If someone are interested in this discussion I can explain.

Two sinusoidal modulated in amplitude and with 90grd phase difference are sums.
We obtain a complex wave modulated in both in amplitude and angular.

At the reception Costa's loop must keep in phase........

 

Hello,

Did you notice the warning?
This is an VERY old thread.

Bertus