Version 4
SHEET 1 1240 680
WIRE 464 -224 416 -224
WIRE 592 -224 544 -224
WIRE 640 -224 592 -224
WIRE 784 -224 736 -224
WIRE 928 -224 864 -224
WIRE 464 -128 416 -128
WIRE 592 -128 592 -224
WIRE 592 -128 544 -128
WIRE 736 -96 736 -224
WIRE 752 -96 736 -96
WIRE 848 -96 832 -96
WIRE 928 -96 928 -224
WIRE 928 -96 912 -96
WIRE 208 0 160 0
WIRE 336 0 288 0
WIRE 736 16 736 -96
WIRE 800 16 736 16
WIRE 928 16 928 -96
WIRE 928 16 864 16
WIRE 0 32 0 -16
WIRE 240 112 240 96
WIRE 160 128 160 0
WIRE 208 128 160 128
WIRE 816 128 816 112
WIRE 336 144 336 0
WIRE 336 144 272 144
WIRE 384 144 336 144
WIRE 736 144 736 16
WIRE 736 144 624 144
WIRE 784 144 736 144
WIRE 0 160 0 112
WIRE 0 160 -176 160
WIRE 96 160 0 160
WIRE 208 160 96 160
WIRE 928 160 928 16
WIRE 928 160 848 160
WIRE 960 160 928 160
WIRE 784 176 736 176
WIRE 0 192 0 160
WIRE 240 192 240 176
WIRE 816 208 816 192
WIRE 96 224 96 160
WIRE -176 240 -176 160
WIRE 624 272 624 144
WIRE 0 304 0 256
WIRE 224 400 224 368
WIRE 352 400 352 368
WIRE -176 416 -176 320
WIRE 0 416 0 384
WIRE 96 416 96 288
WIRE 624 448 624 352
WIRE 224 512 224 480
WIRE 352 512 352 480
FLAG 0 -16 vb
FLAG 352 368 vb
FLAG 224 368 vcc
FLAG 240 96 vcc
FLAG 240 192 0
FLAG 0 416 0
FLAG 96 416 0
FLAG 224 512 0
FLAG 352 512 0
FLAG 384 144 out1
FLAG -176 416 0
FLAG 816 112 vcc
FLAG 816 208 0
FLAG 960 160 out2
FLAG 624 448 0
FLAG 736 176 vb
FLAG 416 -224 out1
FLAG 416 -128 out2
FLAG 640 -224 out
SYMBOL Opamps\\opamp2 240 80 R0
SYMATTR InstName U1
SYMATTR Value LM6211
SYMBOL voltage 224 384 R0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL voltage 352 384 R0
SYMATTR InstName V2
SYMATTR Value 3
SYMBOL res -16 16 R0
SYMATTR InstName R1
SYMATTR Value 1Meg
SYMBOL res -16 288 R0
SYMATTR InstName R2
SYMATTR Value 820
SYMBOL cap -16 192 R0
SYMATTR InstName C1
SYMATTR Value 3.3n
SYMBOL cap 80 224 R0
SYMATTR InstName C2
SYMATTR Value 56p
SYMBOL res 192 16 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value {R}
SYMBOL current -176 320 M180
WINDOW 0 24 80 Left 2
WINDOW 3 24 0 Left 2
WINDOW 123 24 -28 Left 2
WINDOW 39 0 0 Left 0
SYMATTR InstName I1
SYMATTR Value 0
SYMATTR Value2 AC 1
SYMBOL Opamps\\opamp2 816 96 R0
SYMATTR InstName U2
SYMATTR Value LM6211
SYMBOL res 848 -112 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 820
SYMBOL cap 912 -112 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value 3.3n
SYMBOL cap 864 0 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C4
SYMATTR Value 56p
SYMBOL current 624 352 M180
WINDOW 0 24 80 Left 2
WINDOW 3 24 0 Left 2
WINDOW 123 24 -28 Left 2
WINDOW 39 0 0 Left 0
SYMATTR InstName I2
SYMATTR Value 0
SYMATTR Value2 AC 1
SYMBOL res 768 -208 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R4
SYMATTR Value 1k ac 1T
SYMBOL res 448 -112 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R6
SYMATTR Value {1+1G*(1-x)}
SYMBOL res 448 -208 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R7
SYMATTR Value {1+1G*x}
TEXT -184 -232 Left 2 !.step param R list 1 1k\n.step param x list 0 1
TEXT -184 -168 Left 2 ;.ac dec 100 10 100Meg
TEXT -184 -136 Left 2 !.noise V(out) I1 dec 100 10k 100Meg
TEXT -184 -272 Left 2 !.lib LM6211.MOD