Version 4
SHEET 1 880 680
WIRE 144 0 32 0
WIRE -112 0 -160 0
WIRE 224 0 272 0
WIRE 272 0 272 160
WIRE 272 160 176 160
WIRE 32 0 -32 0
WIRE 48 208 0 208
WIRE 112 224 112 272
WIRE 112 96 112 80
WIRE 0 240 0 208
WIRE 0 208 -80 208
WIRE 0 320 0 352
WIRE -160 208 -256 208
WIRE -256 208 -256 240
WIRE -256 320 -256 352
WIRE 272 160 400 160
WIRE 144 192 144 256
WIRE 144 256 192 256
WIRE 256 256 288 256
WIRE 368 256 400 256
WIRE 400 256 400 160
WIRE 272 384 272 352
WIRE 400 384 400 352
WIRE 272 464 272 496
WIRE 400 464 400 496
WIRE 400 160 496 160
WIRE 496 160 496 208
WIRE 496 272 496 320
WIRE 32 112 32 0
WIRE 32 112 48 112
FLAG 112 80 vcc
FLAG 112 272 vss
FLAG -160 0 0
FLAG 0 352 0
FLAG -256 352 0
FLAG 400 496 0
FLAG 272 496 0
FLAG 272 352 vcc
FLAG 400 352 vss
FLAG 496 320 0
SYMBOL res 128 16 R270
WINDOW 0 -28 28 VTop 0
WINDOW 3 -6 90 VBottom 0
SYMATTR InstName R1
SYMATTR Value 500
SYMBOL res -128 16 R270
WINDOW 0 -30 20 VTop 0
WINDOW 3 -8 104 VBottom 0
SYMATTR InstName R2
SYMATTR Value 500
SYMBOL res -16 224 R0
SYMATTR InstName R3
SYMATTR Value 100
SYMBOL res -176 224 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R4
SYMATTR Value 100
SYMBOL voltage -256 224 R0
WINDOW 3 96 201 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value PULSE(0 5 0 10n 10n 90n 200n)
SYMATTR InstName V1
SYMBOL cap 192 272 R270
WINDOW 0 32 32 VTop 0
WINDOW 3 0 32 VBottom 0
SYMATTR InstName Cf
SYMATTR Value 22p
SYMBOL res 272 272 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName Rf
SYMATTR Value 750
SYMBOL voltage 272 368 R0
SYMATTR InstName V2
SYMATTR Value 12
SYMBOL voltage 400 368 R0
SYMATTR InstName V3
SYMATTR Value -12
SYMBOL cap 480 208 R0
SYMATTR InstName Cload
SYMATTR Value 100p
SYMBOL H:\\ELE\\SOFT\\Ecad\\LtSpice\\OpAmps\\XOpAmp&Var\\Ad844a 112 160 R0
SYMATTR InstName U1
TEXT -224 64 Left 0 !.tran 0 1u 0 1n
TEXT -168 -40 Left 0 ;Opamp requires compensation (Rf,Cf) with pure capacitive loads.
TEXT -160 -168 Left 0 ;Specific Symbol AD844A used.\n \nIt requires the model file ad844a.cir either in the working directory\nor in the LTSPICE installation folder, e.g.  ...\\Lib\\sub\\ad844a.cir .
TEXT -232 104 Left 0 ;symbol "ad844a"