What conditions should be set on LO and BB inputs and RF output to perform Balanced AM with a suppressed carrier?

Apply only the I waveform and no Q waveform (or vice versa). This results in RF = cos(W_LO*t) * cos(W_BB*t) = { cos[ (W_LO + W_BB)*t ] + cos[ (W_LO - W_BB)*t ] } / 2, which includes both sidebands. When you just operate one side of ADL5375 or any IQ modulator, you are reducing the functionality to a simple mixer.

Baseband Bandwidth of ADL5375 Broadband IQ Modulator

Q. Do you have a plot showing the baseband bandwidth of the ADL5375? ------------------------------------------------------------------------------------------------------------------- A. The two attached plots show the results of baseband frequency sweeps of the ADL5375-05 and ADL5375-15. In both cases, the frequency cruvature of the IQ Modulator's RF output response has been calibrated out. The ADL5375-05 has a 3 dB bandwidth of 750 MHz. In the case of the ADL5375-15, the device's baseband response was measured up to approximately 850 MHz at which point it was 1 dB down. ADL5375-05 Baseband Bandwidth ADL5375-15 Baseband Bandwidth

Is there a Performance Benefit Associated with Driving the ADL5375 Local Oscillator Input Differentially?

Q. Is there a Performance Benefit Associated with Driving the ADL5375 Local Oscillator Input Differentially? --------------------------------------------------------------------------------------------------------------------- A. The LO inputs of most IQ Modulators can be driven single-ended(the unused LO input is ac-coupled to ground) or differentially. While most of ADI's IQ Modulators are specified for single-end LO drive, differential LO drive can improve performance. Differential LO drive results in some common mode rejection, cancellation of even-order LO harmonics and can improve modulator quadrature accuracy. While differential LO drive has traditionally required the use of an external balun to convert the signal from a single-ended VCO, to differential mode, modern PLL/VCOs such as the ADF4350 provide a differential output which can be directly interfaced to the IQ Modulator or Demodulator. The attached plots compare Sideband Suppression, OIP2 and 2 nd harmonic distortion when the ADL5375-05's LO input is driven single-ended and differentially. The most notable performance difference is sideband suppression in the 1500 MHz range. The measurements showed no difference in output power, LO leakage, 3 rd order distortion, and OIP3. The TC1-1-43+(600MHz ~ 4GHz) transformer was used to generate the differential LO. Based on these results, we would recommend that if a differential LO is available (e.g. from a device like the ADF4350), then it is worth using this to drive the ADL5375 differentially. However, if only a single-ended LO signal is available, in this case it is probably not worthwhile to spend the money on a balun to achieve a differential LO drive.