To do this, constant impedance and conductance circles, which crosses points of the reflection coefficient to be matched and center of Smith chart. Reflection coefficients are converted to impedances which should be conjugate matched to 50Ω impedance. Optimal input and output reflection coefficients. Using figure above, source reflection coefficientĪre found which gives optimal compromise between gain and noise figure.įigure 5. Constant gain, noise figure and input/output stability circles. Input and output stability circles lays outside of smith chart, which means that amplifier is unconditionally stable or stable with all source and load impedances.įigure 4. Next, after cascading shunt resistor at the output of amplifier, constant gain, noise figure and input/output stability circles are drawn in figure 4.
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