I wanted to know the primary difference between an Inphase/Quadrature (I/Q) Demodulator and an I/Q Mixer.
My requirements are as follows: My input signal is a 500 Mhz bandwidth signal centred around 4.25 Ghz. I need to obtain the I and Q components of the baseband signal with respect to the Local Oscillator( of 4.25 Ghz ).
Previously a Hittite chip [HMC620](http://www.hittite.com/products/view.html/view/HMC620I/Q Mixer) which has been described as a "mixer" in the datasheet. But I am unable to find an I/Q "mixer" from big companies like Texas Instruments or Analog Devices (the companies that are easily available). If my understanding is correct, an I/Q demodulator (TI and AD ics available) should also do the job I require.Is this correct?
UPDATE 1 :
The TI I/Q demodulator chip i am talking about is TRF371135 . while the Analog Devices one is ADL5380. They do not exactly satisfy my 500Mhz bandwidth requirement, but they are the closest I could find on Digikey.
Are all I/Q demodulators I/Q mixers ? Or am I going fundamentally wrong somewhere ?