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Transcript

To design an amplifier stage, a source and load impedance combination must be found that gives the gain desired. Synthesis can be accomplished in three stages. Step 1 The vector voltmeter measures the scattering parameters over the frequency range desired. Step 2 Transducer power gain is plotted versus frequency using equation 19 and the measured data from step 1. This determines the frequency response of the uncompensated transistor network so that a constant-gain amplifier can be designed. Step 3 Source and load impedances must be selected to provide the proper compensation of a constant power gain from 100 to 500 Mhz. Such a constant-gain amplifier is de- signed according to the following: â¢ Plot SnÂ° on the Smith chart. The magnitude of Sn* is the linear distance measured from the center of the Smith chart. Radius from the center of the chart to any point on the locus of Sn represents a reflection coefficient r. The value of r can therefore be determined at any frequency by drawing a line from the origin of the chart to a value of su* at the frequency of Step3 -lOOMhz^ONSTANT â SOOMhz | CIRCLES J *M Source impedance is found by inspecting the input plane for realizable source loci that give proper gain. Phase angle is read on the peripheral scale "angle of reflection coefficient in degrees." Electronics | September 5, 1966