I am an Engineering Student and studying about RF Mixers. I want to know what are Amplitude Balance and Phase Balance in RF Mixers and how much critical are these parameters? Mixer HMC-C041
A direct conversion receiver uses two quadrature sinusoidal signals to perform the so-called quadrature down conversion. This process requires shifting the local oscillator (LO) signal by 90 degrees to produce a quadrature sinusoidal component. When mismatches exist between the gain and phase of the two sinusoidal signals and/or along the two branches of down-conversion mixers, amplifiers, and low-pass filters, the quadrature baseband signals will be corrupted.
in the case of the HMC-C041, the amplitude imbalance is 0.5dB and the phase imbalance is 5deg.
there are several detailed tutorials on this topic at analog-dialogue.