Version 4
SHEET 1 1960 680
WIRE -160 -304 -208 -304
WIRE -80 -304 -96 -304
WIRE 32 -304 0 -304
WIRE 336 -304 256 -304
WIRE 464 -304 400 -304
WIRE -432 -160 -432 -304
WIRE 352 -144 352 -208
WIRE -80 -128 -80 -208
WIRE 464 -128 464 -304
WIRE 464 -128 384 -128
WIRE 528 -128 464 -128
WIRE 720 -128 608 -128
WIRE 32 -112 32 -304
WIRE 32 -112 -48 -112
WIRE 96 -112 32 -112
WIRE 256 -112 256 -304
WIRE 256 -112 176 -112
WIRE 320 -112 256 -112
WIRE -208 -96 -208 -304
WIRE -112 -96 -208 -96
WIRE 464 -96 384 -96
WIRE 32 -80 -48 -80
WIRE -80 0 -80 -64
WIRE 32 0 32 -80
WIRE 352 0 352 -80
WIRE 464 0 464 -96
WIRE 1664 96 1584 96
WIRE 1824 96 1744 96
WIRE -432 112 -432 -80
WIRE -208 112 -208 -96
WIRE 96 112 -208 112
WIRE 352 112 176 112
WIRE 464 112 352 112
WIRE 528 112 464 112
WIRE 656 112 608 112
WIRE 544 256 544 208
WIRE 464 272 464 112
WIRE 512 272 464 272
WIRE 1712 272 1712 208
WIRE 656 288 656 112
WIRE 656 288 576 288
WIRE 720 288 720 -128
WIRE 720 288 656 288
WIRE 784 288 784 208
WIRE 784 288 720 288
WIRE 896 288 784 288
WIRE 1008 288 976 288
WIRE 1152 288 1088 288
WIRE 1216 288 1216 208
WIRE 1216 288 1152 288
WIRE 1344 288 1216 288
WIRE 1456 288 1408 288
WIRE 1584 288 1584 96
WIRE 1584 288 1536 288
WIRE 1680 288 1584 288
WIRE 144 304 -208 304
WIRE 240 304 144 304
WIRE 512 304 240 304
WIRE 1824 304 1824 96
WIRE 1824 304 1744 304
WIRE 1904 304 1824 304
WIRE 1680 320 1584 320
WIRE 240 368 240 304
WIRE 352 368 352 112
WIRE -448 384 -448 304
WIRE -352 384 -352 304
WIRE -208 384 -208 304
WIRE 144 384 144 304
WIRE 1152 400 1152 288
WIRE 1584 400 1584 320
WIRE -448 560 -448 464
WIRE -352 560 -352 464
WIRE -208 560 -208 464
WIRE 144 560 144 448
WIRE 240 560 240 448
WIRE 352 560 352 448
WIRE 544 560 544 320
WIRE 1152 560 1152 464
WIRE 1584 560 1584 480
WIRE 1712 560 1712 336
FLAG 464 0 Vref
FLAG 32 0 Vref
FLAG -352 304 Vref
FLAG -352 560 0
FLAG -208 560 0
FLAG 144 560 0
FLAG -448 304 +V
FLAG -448 560 0
FLAG 544 560 0
FLAG 544 208 +V
FLAG -80 0 0
FLAG 352 0 0
FLAG 352 -208 +V
FLAG -80 -208 +V
FLAG 240 560 Vref
FLAG 352 560 Vref
FLAG 1584 560 Vref
FLAG 1712 208 +V
FLAG 1152 560 Vref
FLAG 1904 304 out
FLAG 784 208 TP1
FLAG 1216 208 TP2
FLAG 1712 560 0
FLAG -432 112 Vref
FLAG -432 -304 +V
SYMBOL res 16 -320 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 910
SYMBOL cap 400 -320 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 2.2n
SYMBOL cap -96 -320 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 2.2n
SYMBOL res 192 -128 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 7.5k
SYMBOL res 192 96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 100
SYMBOL res 624 96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 9.9k
SYMBOL res 624 -144 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 7.5k
SYMBOL voltage -208 368 R0
WINDOW 123 24 124 Left 2
WINDOW 39 24 152 Left 2
SYMATTR Value2 AC 1
SYMATTR SpiceLine Rser=4.4k Cpar=13p
SYMATTR InstName V1
SYMATTR Value SINE(2.4 0.00125 100k)
SYMBOL voltage -352 368 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 1.8
SYMBOL cap 128 384 R0
SYMATTR InstName C20
SYMATTR Value 33p
SYMBOL Opamps\\LT6204 544 288 R0
SYMATTR InstName U1
SYMBOL voltage -448 368 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value 3.3
SYMBOL Opamps\\LT6204 352 -112 M0
SYMATTR InstName U2
SYMBOL Opamps\\LT6204 -80 -96 M0
SYMATTR InstName U3
SYMBOL res 224 352 R0
SYMATTR InstName R20
SYMATTR Value {Rbal}
SYMBOL res 336 352 R0
SYMATTR InstName R7
SYMATTR Value {Rbal}
SYMBOL Opamps\\LT6204 1712 304 R0
SYMATTR InstName U4
SYMBOL res 1552 272 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R9
SYMATTR Value {Rf}
SYMBOL res 1760 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R10
SYMATTR Value {Rg}
SYMBOL ind 1104 272 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName L1
SYMATTR Value 100µ
SYMBOL cap 1136 400 R0
SYMATTR InstName C3
SYMATTR Value 2.2n
SYMBOL res 992 272 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R8
SYMATTR Value 330
SYMBOL res 1568 384 R0
SYMATTR InstName R11
SYMATTR Value {Rfg}
SYMBOL cap 1408 272 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C4
SYMATTR Value 1µ
SYMBOL bi -432 -160 R0
SYMATTR InstName B1
SYMATTR Value I=50uA
TEXT 808 32 Left 2 !.lib opamp.sub
TEXT 808 64 Left 2 !.option numdgt=10
TEXT 808 96 Left 2 !.option plotwinsize=0
TEXT 808 -256 Left 3 !;ac oct 40 1k 10Meg
TEXT 808 -216 Left 3 !;noise V(out) V1 dec 40 1k 10Meg
TEXT 808 -296 Left 3 !.tran 0 5m 1m 0.1u
TEXT 808 -176 Left 3 !;noise V(TP1) V1 dec 40 1k 10Meg
TEXT 128 232 Left 2 !.param Rbal=200k
TEXT 808 -96 Left 2 !.param Rg=9*Rf
TEXT 808 -64 Left 2 !.param Rf=10k
TEXT 1072 -96 Left 2 !.param Rfg=((Rf*Rg)/(Rf+Rg))