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Joseph Hopfmüller
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examples/Educational/GFT.asc
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examples/Educational/GFT.asc
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Version 4
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SHEET 1 2208 680
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WIRE 272 -848 160 -848
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WIRE 976 -480 976 -512
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WIRE 976 -480 848 -480
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WIRE -112 -464 -112 -560
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WIRE -32 -432 -32 -464
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WIRE 128 -160 128 -176
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WIRE -112 -96 -112 -304
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WIRE 32 -96 32 -128
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WIRE 224 -96 80 -96
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WIRE 976 -80 864 -80
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WIRE 608 -64 608 -80
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WIRE -112 16 -112 0
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WIRE 608 32 608 16
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FLAG -112 16 0
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FLAG 128 -160 0
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FLAG -16 -176 Y
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FLAG 416 -400 0
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FLAG 1056 -832 0
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FLAG 608 32 0
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FLAG 1040 -176 0
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FLAG 1040 -288 O
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SYMBOL voltage -112 -96 R0
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WINDOW 123 21 100 Left 2
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WINDOW 39 0 0 Left 2
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SYMATTR Value2 AC {1-z*z}
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SYMATTR InstName Vi
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SYMATTR Value ""
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SYMBOL current 16 -304 R270
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WINDOW 0 32 40 VTop 2
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WINDOW 3 -32 40 VBottom 2
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WINDOW 123 -35 42 VBottom 2
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WINDOW 39 0 0 Left 2
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SYMATTR InstName Iz
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SYMATTR Value ""
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SYMATTR Value2 AC {0.5*z*(z+1)}
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SYMBOL voltage 224 -304 R0
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WINDOW 123 0 0 Left 2
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WINDOW 39 0 0 Left 2
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WINDOW 3 31 87 Left 2
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WINDOW 0 31 35 Left 2
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SYMATTR Value 0
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SYMATTR InstName Viy
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SYMBOL voltage 224 -208 R0
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WINDOW 123 23 96 Left 2
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WINDOW 39 0 0 Left 2
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WINDOW 0 33 28 Left 2
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SYMATTR Value2 AC {0.5*z*(z-1)}
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SYMATTR InstName Vz
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SYMATTR Value ""
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SYMBOL e 0 -176 R270
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WINDOW 0 29 89 VRight 2
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WINDOW 3 -31 91 VRight 2
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SYMATTR InstName Ey
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SYMATTR Value 1
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SYMBOL res -128 -480 R0
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SYMATTR InstName Rs
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SYMATTR Value 100
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SYMBOL voltage 128 -432 R90
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WINDOW 0 -32 56 VBottom 2
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WINDOW 3 32 56 VTop 2
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WINDOW 123 32 56 VTop 2
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WINDOW 39 32 56 VTop 2
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SYMATTR InstName V1
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SYMATTR Value 0
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SYMBOL cap -48 -528 R0
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SYMATTR InstName C1d
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SYMATTR Value 30p
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SYMBOL res 144 -544 R0
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SYMATTR InstName Rm1
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SYMATTR Value 50
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SYMBOL cap -48 -656 R0
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SYMATTR InstName Ct1
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SYMATTR Value 5p
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SYMBOL bi 160 -656 R0
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SYMATTR InstName B1
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SYMATTR Value I=I(V1)
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SYMBOL res 144 -832 R0
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SYMATTR InstName R3
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SYMATTR Value 200
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SYMBOL cap 256 -768 R0
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SYMATTR InstName C2d
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SYMATTR Value 16p
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SYMBOL voltage 416 -784 R90
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WINDOW 0 -32 56 VBottom 2
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WINDOW 3 32 56 VTop 2
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WINDOW 123 32 56 VTop 2
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WINDOW 39 32 56 VTop 2
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SYMATTR InstName V2
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SYMATTR Value 0
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SYMBOL res 400 -784 R0
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SYMATTR InstName Rm2
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SYMATTR Value 200
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SYMBOL cap 256 -640 R0
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SYMATTR InstName Ct2
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SYMATTR Value 5p
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SYMBOL bi 416 -560 M180
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WINDOW 0 26 78 Left 2
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WINDOW 3 24 0 Left 2
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SYMATTR InstName B2
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SYMATTR Value I=I(V2)
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SYMBOL cap 400 -512 R0
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SYMATTR InstName Cc
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SYMATTR Value 5p
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SYMBOL res 272 -528 R0
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SYMATTR InstName R8
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SYMATTR Value 10Meg
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SYMBOL cap 560 -800 R0
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SYMATTR InstName C3t
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SYMATTR Value 5p
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SYMBOL bi 704 -816 R0
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WINDOW 3 25 81 Left 2
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SYMATTR Value I=I(V3)
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SYMATTR InstName B3
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SYMBOL cap 560 -656 R0
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SYMATTR InstName C3d
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SYMATTR Value 30p
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SYMBOL res 688 -704 R0
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SYMATTR InstName Rm3
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SYMATTR Value 50
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SYMBOL voltage 704 -608 R0
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WINDOW 123 0 0 Left 2
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WINDOW 39 0 0 Left 2
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SYMATTR Value 0
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SYMATTR InstName V3
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SYMBOL cap 832 -800 R0
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SYMATTR InstName C4t
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SYMATTR Value 50p
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SYMBOL bi 976 -800 R0
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SYMATTR InstName B4
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SYMATTR Value I=I(V4)
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SYMBOL cap 832 -624 R0
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SYMATTR InstName C4d
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SYMATTR Value 160p
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SYMBOL res 960 -704 R0
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SYMATTR InstName Rm4
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SYMATTR Value 10
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SYMBOL voltage 976 -608 R0
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WINDOW 123 0 0 Left 2
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WINDOW 39 0 0 Left 2
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SYMATTR Value 0
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SYMATTR InstName V4
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SYMBOL res 592 -80 R0
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SYMATTR InstName R1
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SYMATTR Value 100
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SYMBOL res 880 -96 R90
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WINDOW 0 0 56 VBottom 2
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WINDOW 3 32 56 VTop 2
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SYMATTR InstName R2
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SYMATTR Value 900
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SYMBOL res 1024 -288 R0
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SYMATTR InstName RL
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SYMATTR Value 1k
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TEXT 232 16 Left 2 !.ac dec 100 100m 100G
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TEXT 232 -48 Left 2 !.param z=0
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TEXT 232 -16 Left 2 !.step param z list -1 0 1
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TEXT 136 56 Top 1 ;This example schematic is supplied for informational/educational purposes only.\nWe thank Frank Wiedmann for contributing this example.
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TEXT 80 -872 Bottom 2 ;This example shows how to simulate the quantities of the General Feedback Theorem, which are defined in the article\n R. David Middlebrook, "The General Feedback Theorem: A Final Solution for Feedback Systems", IEEE Microwave Magazine, vol. 7, no. 2, pp. 50-63, April 2006.\nThis article can be downloaded from http://resolver.caltech.edu/CaltechAUTHORS:MIDieeemm06 .\nSee also message 18008 of the independent LTspice users' group at http://groups.yahoo.com/group/LTspice where this method was originally presented by Frank Wiedmann.
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TEXT -936 -744 Left 2 ;* For this example, add the following definitions to the plot.defs file:\n* A() is an auxiliary quantity.\n* Dd() corresponds to D.\n* Hinf() corresponds to H_infinity.\n* All other function names are equal to those of the corresponding quantities.\n \n.func A() = V(o)@2*(V(y)@1*I(Viy)@3-V(y)@3*I(Viy)@1)+V(o)@1\n+ *(V(y)@3*I(Viy)@2-V(y)@2*I(Viy)@3)+V(o)@3\n+ *(V(y)@2*I(Viy)@1-V(y)@1*I(Viy)@2)\n.func Dd() = V(y)@1*I(Viy)@3-V(y)@3*I(Viy)@1\n.func H() = V(o)@2\n.func Hinf() = A()/Dd()\n.func T() = 1/(1/Dd()-1)\n.func Dn() = H()/A()\n.func Tn() = 1/(Dn()-1)\n.func D0() = 1-Dd()\n.func H0() = (H()-A())/D0()
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