Version 4
SHEET 1 1112 1268
WIRE -64 -272 -96 -272
WIRE 32 -272 0 -272
WIRE -352 -208 -352 -224
WIRE 272 -208 272 -240
WIRE -32 -160 -32 -176
WIRE -96 -144 -96 -272
WIRE -64 -144 -96 -144
WIRE 32 -128 32 -272
WIRE 32 -128 0 -128
WIRE 96 -128 32 -128
WIRE 224 -128 176 -128
WIRE -352 -112 -352 -128
WIRE -64 -112 -352 -112
WIRE 272 -112 272 -160
WIRE -352 -96 -352 -112
WIRE -32 -80 -32 -96
WIRE -352 0 -352 -16
WIRE -224 0 -352 0
WIRE -96 0 -96 -144
WIRE -96 0 -144 0
WIRE 32 0 -96 0
WIRE 272 0 272 -112
WIRE 272 0 112 0
WIRE 192 80 -48 80
WIRE -880 112 -880 64
WIRE -720 112 -720 64
WIRE -576 112 -576 64
WIRE -48 112 -48 80
WIRE 592 144 496 144
WIRE 272 160 272 0
WIRE 368 160 272 160
WIRE 496 160 496 144
WIRE 496 160 368 160
WIRE 592 160 592 144
WIRE 128 192 128 176
WIRE 192 208 192 80
WIRE 192 208 160 208
WIRE -352 224 -352 0
WIRE -48 224 -48 192
WIRE -48 224 -352 224
WIRE 96 224 -48 224
WIRE -880 240 -880 192
WIRE -720 240 -720 192
WIRE -720 240 -880 240
WIRE -576 240 -576 192
WIRE -576 240 -720 240
WIRE 272 240 160 240
WIRE 368 240 272 240
WIRE 496 240 368 240
WIRE 496 256 496 240
WIRE 592 256 592 240
WIRE 592 256 496 256
WIRE -64 272 -96 272
WIRE 32 272 0 272
WIRE 128 272 128 256
WIRE -576 288 -576 240
WIRE -352 336 -352 320
WIRE 272 336 272 240
WIRE -880 384 -880 240
WIRE -752 384 -880 384
WIRE -576 384 -576 368
WIRE -576 384 -688 384
WIRE -32 384 -32 368
WIRE -96 400 -96 272
WIRE -64 400 -96 400
WIRE -576 416 -576 384
WIRE 32 416 32 272
WIRE 32 416 0 416
WIRE 96 416 32 416
WIRE 224 416 176 416
WIRE -352 432 -352 416
WIRE -64 432 -352 432
WIRE -352 448 -352 432
WIRE -32 464 -32 448
WIRE -880 512 -880 384
WIRE -752 512 -880 512
WIRE -576 512 -576 496
WIRE -576 512 -688 512
WIRE -96 544 -96 400
WIRE 272 544 272 432
WIRE 272 544 -96 544
WIRE -880 560 -880 512
WIRE -576 560 -576 512
WIRE 272 560 272 544
WIRE -352 656 -352 528
WIRE 272 656 272 640
WIRE 272 656 -352 656
WIRE 272 672 272 656
FLAG 272 672 0
FLAG 368 240 V-
FLAG 368 160 V+
FLAG 272 -240 VSup
FLAG -576 64 VCC
FLAG -576 560 VEE
FLAG -32 -80 VEE
FLAG -32 464 VEE
FLAG -32 -176 VCC
FLAG -32 368 VCC
FLAG -720 64 VSup
FLAG -352 -224 VVRef
FLAG -352 320 VVRef
FLAG -880 64 VVRef
FLAG 128 272 VEE
FLAG 128 176 VCC
FLAG -880 560 0
SYMBOL nmos 224 -208 R0
SYMATTR InstName M1
SYMATTR Value IRFZ48N
SYMBOL voltage -576 96 R0
WINDOW 123 0 0 Left 0
WINDOW 39 24 124 Left 2
SYMATTR SpiceLine Rser=0.01
SYMATTR InstName VVCC
SYMATTR Value 20
SYMBOL nmos 224 336 R0
SYMATTR InstName M2
SYMATTR Value IRFZ48N
SYMBOL res 192 -144 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL res 192 400 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL res 576 144 R0
SYMATTR InstName RLoad
SYMATTR Value 'RL'
SYMBOL res 256 544 R0
SYMATTR InstName RShunt
SYMATTR Value 1
SYMBOL voltage -880 96 R0
WINDOW 123 0 0 Left 0
WINDOW 39 24 124 Left 2
SYMATTR SpiceLine Rser=1
SYMATTR InstName VRef
SYMATTR Value 10
SYMBOL res -368 -224 R0
SYMATTR InstName R3
SYMATTR Value 100k
SYMBOL res -368 -112 R0
SYMATTR InstName R4
SYMATTR Value 100k
SYMBOL res -368 320 R0
SYMATTR InstName R5
SYMATTR Value 200k
SYMBOL res -368 432 R0
SYMATTR InstName R6
SYMATTR Value 112
SYMBOL voltage -576 272 R0
WINDOW 123 0 0 Left 0
WINDOW 39 24 124 Left 2
SYMATTR SpiceLine Rser=10
SYMATTR InstName VVEE
SYMATTR Value 6.8
SYMBOL voltage -720 96 R0
WINDOW 123 0 0 Left 0
WINDOW 39 24 124 Left 2
SYMATTR SpiceLine Rser=0.01
SYMATTR InstName VVSup
SYMATTR Value 20
SYMBOL cap -688 368 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 1m
SYMBOL cap -688 496 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 22µ
SYMBOL res -592 400 R0
SYMATTR InstName R7
SYMATTR Value 10
SYMBOL res -128 -16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R8
SYMATTR Value 100k
SYMBOL res 128 -16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R9
SYMATTR Value 100k
SYMBOL res -64 96 R0
SYMATTR InstName R10
SYMATTR Value 1
SYMBOL Opamps\\AD8672 -32 352 R0
SYMATTR InstName U1
SYMBOL Opamps\\AD8672 -32 -192 R0
SYMATTR InstName U2
SYMBOL Opamps\\AD8672 128 160 M0
SYMATTR InstName U3
SYMBOL cap 0 -288 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value 10n
SYMBOL cap 0 256 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C4
SYMATTR Value 10n
TEXT -840 -40 Left 2 !.op
TEXT -840 -72 Left 2 !.step param RL 10 2k 10
TEXT -280 -240 Left 2 ;-3dB@222Hz