* SPICE netlist
Rlaplace N001 E2_Laplace {Rsource}
R3 lump N002 {R}
C1 N002 0 {C/lambda}
C2 lump 0 {C}
R4 lump N003 {R/k}
C3 N003 0 {C/lambda}
R5 lump N004 {R/k/k}
C4 N004 0 {C/lambda}
R7 lump N005 {R/k/k/k}
C5 N005 0 {C/lambda}
R8 lump N006 {R/k/k/k/k}
C6 N006 0 {C/lambda}
Rlump N001 lump {Rsource}
Rideal N001 Ideal {Rsource}
V3 N001 0 PULSE(0 1 1u 5n 5n 1u 2u) AC 1
C8 Ideal 0 {C0}
V4 E2_Laplace N007 0
E1 N007 0 LAPLACE {I(V4)} = {1/(s*C0+0.07*C0*abs(s)+1/Rleak)}
R2 Ideal 0 {Rleak}
R1 lump 0 {Rleak}
.param C0 100p
.param tangentdelta 1/(Rp* C0*6.28*f0)
.param R 20meg
.param C C0/(1+5/lambda)
.param k 10
.ac dec 1000 10 100meg
.param lambda (-1+sqrt(1+1/(tangentdelta*tangentdelta)))/2
.param Rp 227k
.param f0 100k
.param Rsource=250 Rleak=100meg

* LTspice schematic (.asc)
Version 4
SHEET 1 1344 800
WIRE -672 336 -672 400
WIRE -672 144 -560 144
WIRE -480 144 -400 144
WIRE -240 -208 -240 -176
WIRE -240 -304 -240 -272
WIRE -240 -384 -240 -400
WIRE -352 -208 -352 -176
WIRE -352 -272 -352 -400
WIRE -352 -400 -240 -400
WIRE -64 -400 -240 -400
WIRE -64 -208 -64 -176
WIRE -64 -304 -64 -272
WIRE -64 -384 -64 -400
WIRE 112 -208 112 -176
WIRE 112 -304 112 -272
WIRE 112 -384 112 -400
WIRE -64 -400 112 -400
WIRE 624 -352 624 -400
WIRE 624 -272 624 -176
WIRE 304 -208 304 -176
WIRE 304 -304 304 -272
WIRE 304 -384 304 -400
WIRE 304 -400 112 -400
WIRE 464 -208 464 -176
WIRE 464 -304 464 -272
WIRE 464 -384 464 -400
WIRE 464 -400 304 -400
WIRE 464 -400 624 -400
WIRE -352 -400 -480 -400
WIRE -672 -400 -672 -112
WIRE -560 -400 -672 -400
WIRE -352 16 -352 48
WIRE -352 48 -464 48
WIRE -352 48 -352 64
WIRE -464 48 -464 16
WIRE -480 -112 -464 -112
WIRE -464 -112 -464 -64
WIRE -464 -112 -352 -112
WIRE -352 -112 -352 -48
WIRE -560 -112 -672 -112
WIRE -672 -112 -672 144
WIRE -400 336 -400 400
WIRE -320 144 -400 144
WIRE -400 160 -400 144
WIRE -400 256 -400 240
WIRE -304 -112 -352 -112
WIRE -672 256 -672 144
WIRE 672 -400 624 -400
FLAG -672 400 0
FLAG -240 -176 0
FLAG -352 -176 0
FLAG -64 -176 0
FLAG 112 -176 0
FLAG 624 -176 0
FLAG 304 -176 0
FLAG 464 -176 0
FLAG -352 64 0
FLAG 672 -400 lump
IOPIN 1280 -432 Out
FLAG -400 400 0
FLAG -304 -112 Ideal
IOPIN 304 -144 Out
FLAG -320 144 E2_Laplace
IOPIN 288 112 Out
SYMBOL res -576 160 R270
SYMATTR InstName Rlaplace
SYMATTR Value {Rsource}
SYMBOL res -256 -400 R0
SYMATTR InstName R3
SYMATTR Value {R}
SYMBOL cap -256 -272 R0
SYMATTR InstName C1
SYMATTR Value {C/lambda}
SYMBOL cap -368 -272 R0
SYMATTR InstName C2
SYMATTR Value {C}
SYMBOL res -80 -400 R0
SYMATTR InstName R4
SYMATTR Value {R/k}
SYMBOL cap -80 -272 R0
SYMATTR InstName C3
SYMATTR Value {C/lambda}
SYMBOL res 96 -400 R0
SYMATTR InstName R5
SYMATTR Value {R/k/k}
SYMBOL cap 96 -272 R0
SYMATTR InstName C4
SYMATTR Value {C/lambda}
SYMBOL res 288 -400 R0
SYMATTR InstName R7
SYMATTR Value {R/k/k/k}
SYMBOL cap 288 -272 R0
SYMATTR InstName C5
SYMATTR Value {C/lambda}
SYMBOL res 448 -400 R0
SYMATTR InstName R8
SYMATTR Value {R/k/k/k/k}
SYMBOL cap 448 -272 R0
SYMATTR InstName C6
SYMATTR Value {C/lambda}
SYMBOL res -576 -384 R270
SYMATTR InstName Rlump
SYMATTR Value {Rsource}
SYMBOL res -576 -96 R270
SYMATTR InstName Rideal
SYMATTR Value {Rsource}
SYMBOL voltage -672 240 R0
SYMATTR Value2 AC 1
SYMATTR InstName V3
SYMATTR Value PULSE(0 1 1u 5n 5n 1u 2u)
SYMBOL cap -368 -48 R0
SYMATTR InstName C8
SYMATTR Value {C0}
SYMBOL voltage -400 144 R0
SYMATTR InstName V4
SYMATTR Value 0
SYMBOL Misc\\Epoly -400 240 R0
SYMATTR InstName E1
SYMATTR Value LAPLACE {I(V4)} = {1/(s*C0+0.07*C0*abs(s)+1/Rleak)}
SYMBOL res -480 -80 R0
SYMATTR InstName R2
SYMATTR Value {Rleak}
SYMBOL res 608 -368 R0
SYMATTR InstName R1
SYMATTR Value {Rleak}