I am using TRF370417 quadrature modulator to modulate two sets of IQ balance signals into one unbalance signal.
The two sets of IQ signal frequency = 245.76MHz.
LO frequency = 2686.76MHz.
The output signal frequency should be 2441MHz.
The two sets of input signals are comb spectrum signals which have 80MHz.The flatnesses of input signals are good which are 1dB flatness.
The output of TRF370417 flatness has degraded. Highest and lowest comb-fingers amplitude difference is about 13dB.
Please refer to pictures below.
Could kindly help to give me some suggestions?