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+// Chapter 6 example 15
+//------------------------------------------------------------------------------
+clc;
+clear;
+// Given data
+f2      = 20;       // pump frequency in GHz
+f1      = 2;        // signal frequency in GHz
+
+// Calculations
+Gp      = (f1+f2)/f1;       // power gain if parametric amp. operated as USB up-converter
+Gp_dB   = 10*log10(Gp);     // power gain in dB
+Gp_lsb  = (f2-f1)/f1;       // power gain if parametric amp. operated as LSB up-converter
+Gp_db_lsb = 10*log10(Gp_lsb )// power gain in dB
+
+// output
+mprintf('Power gain of parametric amplifier when operated as USB up-converter = %3.1f dB\n Power gain of parametric amplifier when operated as LSB up-converter = %3.1f dB',Gp_dB,Gp_db_lsb)
+//------------------------------------------------------------------------------