Version 4
SHEET 1 1056 680
WIRE -112 -80 -224 -80
WIRE 16 -80 -32 -80
WIRE 64 -80 16 -80
WIRE 192 -80 64 -80
WIRE 480 -80 256 -80
WIRE -224 -48 -224 -80
WIRE -224 48 -224 32
WIRE 304 64 304 32
WIRE -176 112 -224 112
WIRE -112 112 -176 112
WIRE 16 112 16 -80
WIRE 16 112 -32 112
WIRE 48 112 16 112
WIRE 160 112 128 112
WIRE 272 112 160 112
WIRE 480 144 480 -80
WIRE 480 144 416 144
WIRE 544 144 480 144
WIRE 640 144 544 144
WIRE 160 160 160 112
WIRE -368 176 -368 144
WIRE -224 176 -224 112
WIRE 272 176 240 176
WIRE 640 176 640 144
WIRE 304 256 304 224
WIRE 352 256 304 256
WIRE -448 288 -448 272
WIRE -368 288 -368 256
WIRE -224 288 -224 256
WIRE 160 288 160 224
WIRE 240 288 240 176
WIRE 480 288 480 144
WIRE 480 288 240 288
WIRE 640 304 640 256
FLAG 160 288 0
FLAG 640 304 0
FLAG -224 288 0
FLAG -368 288 0
FLAG -368 144 V+
FLAG -448 288 0
FLAG -448 272 V-
FLAG 352 256 V+
FLAG 304 32 V-
FLAG -224 48 0
FLAG 640 144 out
DATAFLAG 544 144 "round($*1k)/1k"
DATAFLAG -176 112 "round($*1k)/1k"
DATAFLAG 64 -80 "round($*1k)/1k"
SYMBOL cap 144 160 R0
SYMATTR InstName C1
SYMATTR Value 10n
SYMBOL cap 256 -96 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value {C2}
SYMBOL voltage -224 160 R0
WINDOW 123 26 121 Left 2
WINDOW 39 0 0 Left 2
WINDOW 3 30 91 Left 2
SYMATTR Value2 AC 2
SYMATTR Value 0
SYMATTR InstName V1
SYMBOL voltage -368 160 R0
WINDOW 3 40 94 Left 2
WINDOW 123 24 132 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value 3.3
SYMATTR InstName V2
SYMBOL voltage -224 -64 R0
WINDOW 123 24 132 Left 2
WINDOW 39 0 0 Left 2
WINDOW 3 36 80 Left 2
SYMATTR Value 2.5
SYMATTR InstName V3
SYMBOL Misc\\EuropeanResistor 624 160 R0
SYMATTR InstName R4
SYMATTR Value 10k
SYMBOL Misc\\EuropeanResistor -128 -64 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value 20k
SYMBOL Misc\\EuropeanResistor -128 128 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value 20k
SYMBOL Misc\\EuropeanResistor 32 128 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL Opamps\\LTC6084 304 144 M180
SYMATTR InstName U1
TEXT -392 -144 Left 2 !.ac dec 100 10 1E6
TEXT -264 -240 Left 2 !.measure fg find freq when mag(V(out))=1/sqrt(2)
TEXT -128 -176 Left 2 !.step param C2 1n 33n 1n