Version 4
SHEET 1 1448 804
WIRE -16 128 -16 112
WIRE 256 128 256 112
WIRE 528 128 528 112
WIRE -16 224 -16 208
WIRE 256 224 256 208
WIRE 528 224 528 208
WIRE -16 384 -16 368
WIRE 256 384 256 368
WIRE 528 384 528 368
WIRE -16 480 -16 464
WIRE 256 480 256 464
WIRE 528 480 528 464
WIRE -16 656 -16 640
WIRE 256 656 256 640
WIRE -16 752 -16 736
WIRE 256 752 256 736
FLAG 256 224 0
FLAG -16 224 0
FLAG -16 112 X
FLAG 528 224 0
FLAG 528 112 MAX
FLAG 256 112 MIN
FLAG 528 480 0
FLAG 528 368 MINMAX
FLAG 256 480 0
FLAG 256 368 tanh
FLAG -16 480 0
FLAG -16 368 limit
FLAG -16 752 0
FLAG -16 640 MINMAX5
FLAG 256 752 0
FLAG 256 640 MINMAX4
SYMBOL bv 256 112 R0
SYMATTR InstName B1
SYMATTR Value V=dnlim(V(x),-5,1)
SYMBOL voltage -16 112 R0
SYMATTR InstName V1
SYMATTR Value 0
SYMBOL bv 528 112 R0
SYMATTR InstName B2
SYMATTR Value V=uplim(V(x),5,1)
SYMBOL bv 528 368 R0
SYMATTR InstName B3
SYMATTR Value V=dnlim(uplim(V(x),5,1), -5,1)
SYMBOL bv 256 368 R0
SYMATTR InstName B4
SYMATTR Value V=5*tanh(V(x)/5)
SYMBOL bv -16 368 R0
SYMATTR InstName B5
SYMATTR Value V=limit(V(x),-5,5)
SYMBOL bv -16 640 R0
SYMATTR InstName B6
SYMATTR Value V=softlimit5(x)
SYMBOL bv 256 640 R0
SYMATTR InstName B7
SYMATTR Value V=softlimit4(x)
TEXT -24 32 Left 2 !.dc V1 -8 8 1m
TEXT -40 -744 Left 2 ;There are two new limit-functions in LTspice.\n \nThe new functions dnlimit() and uplimit() have the big \nadvantage of continuous derivation compared to the limit()\nfunction. This is a big improvement compared to the limit()\nfunction regarding convergence.\nThey have additionally the advantage of a wide range of\nperfect linearity which makes them superior to the smooth \ntanh() function in most amplifier applications.\n \nLower Limit\ndnlimt(V(x),limit,range)\n \nUpper Limit\nuplimt(V(x),limit,range)\n \nLower and Upper Limit\ndnlim(uplim(V(x),limit_h,range_h),limit_l,range_l) \n \nVery Soft Limit\nconst1*tanh(V(x)/const2)\n \nHard Limit\nlimit(V(x),a,b)\n \nThe parameter "range" defines the width where the function \nsmoothly starts to limit the output.
TEXT 400 616 Left 2 !.func softlimit5(x) {dnlim(uplim(V(x),5,1), -5,1)}
TEXT 400 648 Left 2 !.func softlimit4(x) {dnlim(uplim(V(x),4,1), -4,1)}
RECTANGLE Normal 960 800 -64 512 2