Version 4
SHEET 1 880 680
WIRE 80 32 -64 32
WIRE 272 32 160 32
WIRE 320 32 272 32
WIRE 368 32 320 32
WIRE -64 64 -64 32
WIRE 368 64 368 32
WIRE 272 80 272 32
WIRE 96 96 96 80
WIRE 144 112 144 80
WIRE -64 240 -64 144
WIRE 144 240 144 192
WIRE 144 240 -64 240
WIRE 272 240 272 144
WIRE 272 240 144 240
WIRE 368 240 368 144
WIRE 368 240 272 240
WIRE -64 256 -64 240
FLAG -64 256 0
FLAG 96 96 0
FLAG 320 32 out
SYMBOL cap 256 80 R0
SYMATTR InstName C1
SYMATTR Value {CX}
SYMBOL res 352 48 R0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL voltage -64 48 R0
SYMATTR InstName V1
SYMATTR Value 10
SYMBOL sw 64 32 R270
SYMATTR InstName S1
SYMBOL voltage 144 96 R0
WINDOW 3 -86 181 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value PULSE(10 1n 1n 1n 1 2)
SYMATTR InstName V2
TEXT -64 -240 Left 2 !.model sw sw(Ron=1 Roff=1G Vt=0.5)
TEXT -64 -304 Left 2 !.tran 0 5m 0 1u
TEXT -64 -280 Left 2 !.options plotwinsize=0
TEXT -56 -96 Left 2 !.meas Taus find time when V(out)=2
TEXT -64 -192 Left 2 !.param CX=1u
TEXT -64 -160 Left 2 !.step param CX list 0.5u 1u 1.5u 2u 2.5u 3u
TEXT -80 376 Left 2 ;View -> SPICE Error Log\nRight mouse-click -> Plot stepped meas. data