Signal Type

Hi:

Is the signal generated from the DAC stage of a RF Transmitter comes into the first mixing stage in a In-phase (sine) and Quadrature- phase (cosine) mode or only a In-phase (sine) mode. Please do clarify. Thanks in advance.

Rgds

Hi,
Signal just comes. You resolve it into inphase and quadrature components based on your local oscillator phase. So signal does not come in I and Q arms. It just is.
Hope this helps
B R M

oh,the signal from the DAC is the modulated signal,so the mixer is just the upconverter,it is no the modulater of the mixer,so neither the I signal nor the Q signal