1 files changed, 31 insertions, 0 deletions
diff --git a/605/CH2/EX2.9/2_9.sce b/605/CH2/EX2.9/2_9.sce
new file mode 100755
index 000000000..bad28fa80
--- /dev/null
+++ b/605/CH2/EX2.9/2_9.sce
@@ -0,0 +1,31 @@
+//data in question
+//noise power at Th=290 K(dBm)
+P1=-70
+Th=290
+//noise power at Tc=77 K(dBm)
+P2=-75
+Tc=77
+//given noise temperature(K)
+Ts=450 
+//frequency band B
+B=1.5*10^9-500*10^6
+//power gain of amplifier(10dB=10)
+G=10
+//boltzamn constant
+k=1.38*10^(-23)
+//data print
+printf("\nP1=-70 dBm at Th=290 K\tP2=-75 dBm at Tc=77 K \tTs=450 K G=10\n")
+//equation and result
+printf("\nresult:-")
+//Y-factor(Y=P1/P2 = (P1-P2)dBm)
+Y=10^((P1-P2)/10)
+printf("\n Y-factor = 10^((P1-P2)/10) = %.4f",Y)
+//equivalent noise temperature
+Te=(Th-Y*Tc)/(Y-1)
+printf("\nequivalent noise temperature\nTe=(Th-Y*Tc)/(Y-1)=%.2f K",Te)
+//noise power output of amplifier
+Po=G*k*Ts*B+G*k*Te*B
+printf("\nnoise power output\nPo=G*k*Ts*B+G*k*Te*B=%.4e W",Po)
+printf(" = %.4f dBm\n",10*log10(Po*1000))
+
+