Version 4
SHEET 1 884 708
WIRE 592 -592 560 -592
WIRE 560 -560 560 -592
WIRE 464 -528 432 -528
WIRE 464 -496 432 -496
WIRE 672 -480 640 -480
WIRE 464 -464 432 -464
WIRE 464 -432 432 -432
WIRE 464 -400 432 -400
WIRE 592 -336 560 -336
WIRE 560 -304 560 -336
WIRE 464 -272 432 -272
WIRE 464 -240 432 -240
WIRE 672 -224 640 -224
WIRE 464 -208 432 -208
WIRE 464 -176 432 -176
WIRE 160 -160 160 -176
WIRE 160 -160 144 -160
WIRE 176 -160 160 -160
WIRE 272 -160 272 -176
WIRE 272 -160 256 -160
WIRE 464 -144 432 -144
WIRE 160 -48 160 -64
WIRE 160 -48 144 -48
WIRE 176 -48 160 -48
WIRE 272 -48 272 -64
WIRE 272 -48 256 -48
WIRE 480 -32 384 -32
WIRE 656 -32 480 -32
WIRE 480 -16 480 -32
WIRE 160 16 160 0
WIRE 160 16 144 16
WIRE 384 16 384 -32
WIRE 656 32 656 -32
WIRE 384 160 384 96
WIRE 480 160 480 144
WIRE 480 160 384 160
WIRE 656 160 656 96
WIRE 656 160 480 160
FLAG 656 160 P8
FLAG 656 -32 P7
FLAG 64 -160 0
FLAG 160 -176 P1
FLAG 272 -176 P2
FLAG 64 -48 0
FLAG 160 -64 P4
FLAG 272 -64 P3
FLAG 64 16 0
FLAG 160 0 P8
FLAG 672 -224 PX7
FLAG 432 -144 P8
FLAG 432 -240 P1
FLAG 432 -272 P2
FLAG 432 -176 P4
FLAG 432 -208 P3
FLAG 592 -336 PX6
FLAG 672 -480 PY7
FLAG 432 -400 P8
FLAG 432 -496 P1
FLAG 432 -528 P2
FLAG 432 -432 P4
FLAG 432 -464 P3
FLAG 592 -592 PY6
SYMBOL bi 384 96 R180
WINDOW 0 24 80 Left 2
WINDOW 3 -249 -98 Left 2
WINDOW 123 -43 -117 Left 2
SYMATTR InstName B1
SYMATTR Value I=tanh( (5m * V(P1,P2) * V(P3,P4)) / 10u ) * -10u
SYMATTR Value2 Rpar=300k
SYMBOL cap 640 32 R0
SYMATTR InstName Co
SYMATTR Value 100p
SYMBOL voltage 272 -160 R90
WINDOW 0 -32 56 VBottom 2
WINDOW 3 32 56 VTop 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 0
SYMBOL res 160 -176 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 10Meg
SYMBOL voltage 272 -48 R90
WINDOW 0 -32 56 VBottom 2
WINDOW 3 32 56 VTop 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 0
SYMBOL res 160 -64 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 10Meg
SYMBOL res 160 0 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 10Meg
SYMBOL SpecialFunctions\\ota 544 -240 R0
WINDOW 3 -82 116 Left 2
SYMATTR InstName A1
SYMATTR Value G=5m Cout=100p Rout=300K
SYMBOL bv 480 48 R0
SYMATTR InstName B2
SYMATTR Value V=limit(0,V(P7,P8),2)
SYMBOL res 464 -32 R0
SYMATTR InstName Rc
SYMATTR Value 1
SYMBOL SpecialFunctions\\ota 544 -496 R0
WINDOW 3 -82 116 Left 2
SYMATTR InstName U1
SYMATTR Prefix X
SYMATTR SpiceModel OTA_P
SYMATTR Value G=5m Cout=100p Rout=300K
TEXT 56 312 Left 2 ;*A2 N004 N005 N002 5 5 5 I1 5 OTA G=5m Cout=100p Rout=100K\nXA2 N004 N005 N002 5 5 5 I1 5 OTA_P G=5m Cout=100p Rout=100K
TEXT 56 72 Left 2 ;Io = tanh ( Iraw / Isat ) * Isat + Idc + Ioffset
TEXT 72 88 Left 2 ;Iraw = G * Vdiff
TEXT 104 104 Left 2 ;Vdiff = ( Ref - V(1,2) * V(3,4) )
TEXT 72 120 Left 2 ;Isat = ( Isink - Isrc ) / 2
TEXT 72 136 Left 2 ;Idc = ( Isink + Isrc ) / 2
TEXT 56 440 Left 2 ;*A7 0 X0 N002 5 5 5 N010 5 OTA g=100u iout=37.5u en={Gain*97n} enk=8 Cout=12p Vlow=-1e308 Vhigh=1e308\nXA7 0 X0 N002 5 5 5 N010 5 OTA_P g=100u iout=37.5u en={Gain*97n} enk=8 Cout=12p Vlow=-1e308 Vhigh=1e308
TEXT 56 504 Left 2 ;*A1 N004 3 N002 5 5 5 N001 5 OTA G=250u iout=5m Cout=.1p Vlow=-1e308 Vhigh=1e308\nXA1 N004 3 N002 5 5 5 N001 5 OTA_P G=250u iout=5m Cout=.1p Vlow=-1e308 Vhigh=1e308
TEXT 56 568 Left 2 ;*A8 2 N005 N002 5 5 5 N001 5 OTA G=250u iout=5m Cout=.1p Rout=1G Vlow=-1e308 Vhigh=1e308\nXA8 2 N005 N002 5 5 5 N001 5 OTA_P G=250u iout=5m Cout=.1p Rout=1G Vlow=-1e308 Vhigh=1e308
TEXT 56 376 Left 2 ;*A3 N005 N004 N002 5 5 5 I2 5 OTA G=5m Cout=100p Rout=100K\nXA3 N005 N004 N002 5 5 5 I2 5 OTA_P G=5m Cout=100p Rout=100K
TEXT 60 -226 Left 2 !.dc V1 -1 1  V2 -1 1 0.2
TEXT 56 -560 Left 2 !.inc ota_pspice.cir