METHOD FOR MEMORY EFFECTS QUANTIFICATION AND COMPARISON IN RF TRANSMITTERS AND AMPLIFIERS

摘要

The method for memory effects quantification and comparison in RF transmitters and amplifiers is a method in which a processor performs a spectrum analysis of an RF transmitter or RF amplifier device under test (DUT). The processor then calculates a normalized frequency (f_n) according to the relation:; $$ f_n=\frac{f-f_c}{\mathrm{BW}}.$$ ;The processor then utilizes the normalized frequency calculation in a spectrum asymmetry index (SAI) computation characterized by the relation:; $$ \mathrm{SAI}=\frac{1}{K}\sum _{f_n=f_{n,\mathrm{start}}}^{f_n=f_{n,\mathrm{stop}}}P\left(f_n\right)-P\left(-f_n\right).$$ ;Next, utilizing the absolute value of the normalized frequency according to the relation:; $$ f_n=\frac{f-f_c}{\mathrm{BW}},$$ ;the processor displays the calculated SAI and causes a display device to display a mirrored spectrum as a function of the absolute value of the normalized frequency around a zero frequency. The resulting plot and calculated SAI displays reveal the degree of memory effects a given DUT exhibits. Similarly produced display plots among various DUTs can be quantitatively compared utilizing the method's SAI metric.