Version 4
SHEET 1 1280 700
WIRE -48 -128 -128 -128
WIRE 96 -128 -48 -128
WIRE 272 -128 96 -128
WIRE 272 -112 272 -128
WIRE 96 -96 96 -128
WIRE -128 -48 -128 -128
WIRE 96 0 96 -32
WIRE 272 0 272 -32
WIRE 96 16 96 0
WIRE 272 16 272 0
WIRE -128 128 -128 32
WIRE 96 128 96 96
WIRE 96 128 -128 128
WIRE 272 128 272 96
WIRE 272 128 96 128
WIRE -128 160 -128 128
FLAG -128 160 0
FLAG 96 0 1
FLAG 272 0 2
FLAG -48 -128 Ue
SYMBOL res 80 0 R0
SYMATTR InstName R1
SYMATTR Value 100
SYMBOL res 256 0 R0
SYMATTR InstName R2
SYMATTR Value 100
SYMBOL cap 80 -96 R0
SYMATTR InstName C1
SYMATTR Value {CX}
SYMBOL ind 256 -128 R0
SYMATTR InstName L1
SYMATTR Value 100µ
SYMATTR SpiceLine Rser=0
SYMBOL voltage -128 -64 R0
SYMATTR InstName V1
SYMATTR Value AC 1
TEXT -136 280 Left 2 !.ac dec 100 1k 100Meg
TEXT -152 352 Left 2 ;Ua/Ue = -(1+w^2*T1*T2)/((1+jw*T1)*(1+jw*T2))\n|Ua/Ue| = (1+w^2*T^2)/( sqrt(1+(w*T1)^2)*sqrt(1+(w*T2)^2) )\nphi = 180°-arctan(w1*T)  -arctan(w2*T)\n   \nFalls T1=T2=T\nUa/Ue = -(1+w^2*T^2)/(1+jw*T)^2\n|Ua/Ue| = 1\nphi = 180°-2*arctan(w*T)
TEXT 160 -16 Left 2 ;Ua
TEXT -136 240 Left 2 !.step param CX list 0.1n 10n 1u
LINE Normal 224 0 144 0
LINE Normal 208 -16 224 0 2
LINE Normal 224 0 208 -16 2
LINE Normal 208 16 224 0