What is the main difference between these two RF quadrature modulator?
Comparing the noise figure, IIP3, it seems ADL5382/5385/5375 solution have more SNR advantage over the other. Is it true?
It is not necessary that one solution has more advantage over others. It depends on application such as operating frequency, power consumption, package size and so on. Below table shows performance differences among modulators mentioned above at some frequiencies as an example. As mentioned above, performance can be simulated at ADIsimRF.
ADL5385: 30 MHz to 2.2 GHz IQ Mod with 2XLO based Phase Splitter (LO Freq is equal to twice the RF Output Frequency)
AD8349: 700 MHz to 2.7 GHz IQ Mod with IXLO based Phase Splitter
ADL5382: 700 MHz to 2.7 GHz IQ Demodulator (1XLO)
AD8347:800 MHz to 2.7 GHz IQ Demodulator (1XLO) with VGA and Baseband Amplifiers (lower performance and power consumption than ADL5382)
ADL5375: 400 MHz to 6 GHz IQ Modulator (1XLO). Higher IP3 and power consumption than ADL5385 and AD8349.
Comparative performance of these devices can be simulated using ADIsimRF (www.analog.com/adisimrf)
I agree on your opinion.
For GSM 900/1800 band, according to the datasheet
I think ADL5382 is a better solution in the case that power consumption is not a key issue. The noise figure and IIP3 is better than AD8347.
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