Intermodulation Distortion of Third-Order Nonlinear Systems With Memory Under Multisine Excitations

Characterization of SNDR degradation in nonlinear wireless transmitters

“…In [12] it was also proved that the cor- Figure 2. Proposed Behavioral model with long-term memory effects.…”

“…A deep study of this type of scheme can be found in [11,12]. Some authors have represented these effects using some special forms of behavioral models [13], which somehow represent the mechanism that were already described.…”

“…Based on the work presented in [12] it is known that the fundamental zone nonlinear distortion can be described by 6 :…”

“…5 In this case, we consider that the impact of the RF filter can be ignored. 6 Similar assumptions as used in [12], where also considered here, that is: the second harmonic filter and the in-band filter are considered flat all over the interesting bandwidth. related part, in respect to the input signal, is only affected by terms equal to:…”

Co-channel and adjacent channel distortion in microwave amplifiers presenting memory

“…That paper states, for the first time, that a third order nonlinearity presenting memory, coming mainly from the base band impedance characteristics, is perfectly described by a two tone test. Then the authors have also proved in [4], that the low frequency response that impacts the long term memory effects in the co-channel and adjacent channel distortion are different, that means the adjacent channel distortion is more affected by the middle frequency region of the base band impedance, while the co-channel distortion is more affected by the low frequency region of the base band impedance. Based on this fact we can predict that the co-channel best memoryless linearizer, is in fact, different from the adjacent channel optimum linearizer.…”