Stability circles calculation from S-params. Error in book or in my calculations?..

时间：04-05 整理：3721RD 点击：

Here is example from book:
S11=0.70 -57deg
S12=0.04 47deg
S21=10.5 136deg
S22=0.79 -33deg

Results from book:
k=0.41
|delta|=0.69
Cin=39.04 108deg
Rin=38.62
Cout=3.56 70deg
Rout=3.03

Mine result:
k=0.41 - okay
|delta|=0.68 - okay
Cin=13.5 106deg <<<<<<<<<<< ?
Rin=13.08 <<<<<<<<<<<< ?
Cout=3.07 68deg <<<<<<<<<<< ?
Rout=2.52 <<<<<<< ?

The same problem for another example from this book.
Here is my calculations:

Code:

S11=PolarToRect(0.70,-57)S11 = 0.381247325 - 0.587069398i
S12=PolarToRect(0.04,47)S12 = 0.027279934 + 0.029254148i
S21=PolarToRect(10.5,136)S21 = -7.553067904 + 7.29391289i
S22=PolarToRect(0.79,-33)S22 = 0.662549749 - 0.430264838i






A=Conj(S11)A = 0.381247325 + 0.587069398i

Arg(A)Ans = 57
Abs(A)Ans = 0.7
' stab factor

delta=S11*S22-S12*S21delta = 0.419424405 - 0.531018898i
Abs(delta)Ans = 0.676681536
Arg(delta)Ans = -51.69661455

k=(1-Abs(S11)^2-Abs(S22)^2+Abs(delta)^2) / (2*Abs(S12*S21))k = 0.409283216


Cin=Conj(S11-Conj(S22)*delta)/ (Abs(S11)^2-Abs(delta)^2 )  Cin = -3.897594728 + 12.949512775i

Rin=Abs( S12*S21 / ( Abs(S11)^2-Abs(delta)^2 ) )Rin = 13.08325689

Abs(Cin)Ans = 13.523354827
Arg(Cin)Ans = 106.75094833

Rout=Abs( S12*S21 / ( Abs(S22)^2-Abs(delta)^2 ) )Rout = 2.527043907

Cout=Conj(S22-Conj(S11)*delta)/ (Abs(S22)^2-Abs(delta)^2 )  Cout = 1.14860386 + 2.852229548i

Abs(Cout)Ans = 3.074817754

Arg(Cout)Ans = 68.065163428

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