Quadrature Amplitude Modulation Phase shift

USMCinfinity · Apr 17, 2012

Hey guys I'm trying to do a Quadrature Amplitude Modulation circuit in Simulink but I don't know how to do the phase shift, any help on what block should I use?

WimRFP · Apr 17, 2012

Hello,

search for quadrature modulator. Such a modulator uses two mixers that have two base band signal (I and Q) as input. The mixers are fed by a cosine and -sine carrier (derived from one oscillator).

chuckey · Apr 18, 2012

As WimRFP says, as you need 90 degs between the two outputs, this is +- 45 degees wrt the input. So a series R with a C to earth in one leg and a series C and a R to earth in the other leg with Xc = R.
Frank

Quadrature Amplitude Modulation Phase shift

USMCinfinity

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WimRFP

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chuckey

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