Version 4
SHEET 1 1160 680
WIRE 496 48 496 32
WIRE 512 48 496 48
WIRE 880 48 880 32
WIRE 896 48 880 48
WIRE 416 64 416 32
WIRE 496 64 496 48
WIRE 496 64 464 64
WIRE 800 64 800 32
WIRE 880 64 880 48
WIRE 880 64 848 64
WIRE 144 112 48 112
WIRE 288 112 224 112
WIRE 320 112 288 112
WIRE 400 112 320 112
WIRE 544 112 480 112
WIRE 784 112 544 112
WIRE 928 112 864 112
WIRE -160 128 -224 128
WIRE 48 128 48 112
WIRE 288 144 288 112
WIRE 544 144 544 112
WIRE -160 224 -160 208
WIRE 48 224 48 208
WIRE 288 224 288 208
WIRE 544 224 544 208
WIRE 928 224 928 192
FLAG 48 224 0
FLAG 288 224 0
FLAG 512 48 0
FLAG 544 224 0
FLAG 896 48 0
FLAG 928 224 0
FLAG -160 224 0
FLAG -224 128 calc
FLAG 320 112 sim
SYMBOL voltage 48 112 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value {U0}
SYMBOL res 240 96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value {R}
SYMBOL cap 272 144 R0
SYMATTR InstName C1
SYMATTR Value {Cbuf}
SYMBOL sw 496 112 R90
SYMATTR InstName S1
SYMATTR Value mySW
SYMBOL voltage 400 32 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 96 -5 VBottom 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value PULSE(0 1 {1/(2*fs)} 1n 1n {1/(2*fs)} {1/fs})
SYMBOL cap 528 144 R0
SYMATTR InstName C2
SYMATTR Value {Cint}
SYMBOL sw 880 112 R90
SYMATTR InstName S2
SYMATTR Value mySW
SYMBOL voltage 784 32 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 93 104 VBottom 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value PULSE(1 0 {1/(2*fs)} 1n 1n {1/(2*fs)} {1/fs})
SYMBOL res 912 96 R0
SYMATTR InstName R2
SYMATTR Value 0.1
SYMBOL bv -160 112 R0
SYMATTR InstName B1
SYMATTR Value V={CalcV}
TEXT 344 264 Left 2 !.model mySW SW(Ron = 1k, Roff = 10Meg, Vt = 0.5)
TEXT 32 312 Left 2 !.param fs 200k
TEXT 32 344 Left 2 !.param R 1k
TEXT 248 352 Left 2 !.tran 0 50m 0 1m
TEXT 32 376 Left 2 !.param Cbuf 10u
TEXT 32 408 Left 2 !.param Cint 20p
TEXT 32 440 Left 2 !.param CalcV { U0 - Cint * U0 *fs * R}
TEXT 32 280 Left 2 !.param U0 5
TEXT 728 376 Left 2 !.step param R list 1 100 1k