Version 4
SHEET 1 1224 680
WIRE 176 0 112 0
WIRE 304 0 240 0
WIRE 448 48 448 16
WIRE 576 48 576 16
WIRE -352 112 -480 112
WIRE -256 112 -352 112
WIRE -160 112 -256 112
WIRE -48 112 -160 112
WIRE 112 112 112 0
WIRE 112 112 -48 112
WIRE 160 112 112 112
WIRE 304 112 304 0
WIRE 304 112 240 112
WIRE -736 128 -816 128
WIRE -576 128 -736 128
WIRE -736 144 -736 128
WIRE -576 144 -576 128
WIRE 448 160 448 128
WIRE 576 160 576 128
WIRE -256 192 -256 112
WIRE -176 192 -256 192
WIRE -816 224 -816 128
WIRE -736 224 -736 208
WIRE -480 224 -480 112
WIRE -352 224 -352 112
WIRE -176 224 -176 192
WIRE -48 224 -48 112
WIRE -256 240 -256 192
WIRE 208 240 208 224
WIRE 112 256 112 112
WIRE 176 256 112 256
WIRE 304 272 304 112
WIRE 304 272 240 272
WIRE 432 272 304 272
WIRE 528 272 432 272
WIRE 624 272 528 272
WIRE 176 288 112 288
WIRE 528 288 528 272
WIRE 432 304 432 272
WIRE 208 320 208 304
WIRE -256 336 -256 304
WIRE -176 336 -176 304
WIRE -176 336 -256 336
WIRE -816 352 -816 304
WIRE -736 352 -736 304
WIRE -736 352 -816 352
WIRE -576 352 -576 208
WIRE -576 352 -736 352
WIRE -480 352 -480 304
WIRE -480 352 -576 352
WIRE -352 368 -352 304
WIRE -256 368 -256 336
WIRE -48 368 -48 288
WIRE 112 368 112 288
WIRE -816 400 -816 352
WIRE 432 400 432 368
WIRE 528 400 528 368
FLAG 112 368 0
FLAG 208 224 VCC
FLAG 448 160 0
FLAG 448 16 VCC
FLAG -48 368 0
FLAG -256 368 0
FLAG -352 368 0
FLAG 432 400 0
FLAG 624 272 out
FLAG 208 320 VEE
FLAG 528 400 0
FLAG 576 160 0
FLAG 576 16 VEE
FLAG -160 112 in
FLAG -816 400 0
SYMBOL cap -64 224 R0
SYMATTR InstName Ccable
SYMATTR Value 15p
SYMBOL cap 176 16 R270
WINDOW 0 32 32 VTop 0
WINDOW 3 0 32 VBottom 0
SYMATTR InstName C1
SYMATTR Value 3.3p
SYMBOL res 144 128 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R1
SYMATTR Value 1e6
SYMBOL voltage 448 32 R0
WINDOW 123 24 132 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL diode -272 304 M180
WINDOW 0 24 72 Left 0
WINDOW 3 24 0 Left 0
SYMATTR InstName D1
SYMATTR Value DP
SYMBOL cap 416 304 R0
SYMATTR InstName Cload
SYMATTR Value 10p
SYMBOL current -352 224 R0
WINDOW 3 -31 195 Left 0
WINDOW 123 24 116 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value ""
SYMATTR Value2 AC 1
SYMATTR InstName I1
SYMBOL res -192 208 R0
SYMATTR InstName Rsh
SYMATTR Value .25G
SYMBOL res 512 272 R0
SYMATTR InstName Rload
SYMATTR Value 10k
SYMBOL voltage 576 32 R0
WINDOW 123 24 132 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value -5
SYMBOL Opamps\\UniversalOpamp2 208 272 R0
SYMATTR InstName U1
SYMATTR SpiceLine2 en=10n enk=100 in=0 ink=0 Rin=500Meg
SYMBOL current -816 304 R180
WINDOW 0 24 88 Left 0
WINDOW 3 24 0 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName I2
SYMATTR Value 1µ
SYMBOL voltage -736 208 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value 0
SYMBOL bi -480 304 R180
WINDOW 0 24 88 Left 0
WINDOW 3 -48 -87 Left 0
SYMATTR InstName B1
SYMATTR Value I=I(V3)+I(D2)
SYMBOL cap -752 144 R0
SYMATTR InstName C2
SYMATTR Value 1
SYMBOL diode -592 144 R0
SYMATTR InstName D2
TEXT -392 -400 Left 0 ;.include myopamp.abc
TEXT -392 -296 Left 0 ;.tran 0 1m 0 10n
TEXT -392 -272 Left 0 !.options plotwinsize=0
TEXT -392 -336 Left 0 ;.ac dec 100 1k 1e6
TEXT -448 -160 Left 0 !.noise V(out) I1 dec 100 1 1e6
TEXT -464 -192 Left 0 !.model DP D(Is=1e-12 Cjo=310p Rs=10)
TEXT -8 -392 Left 0 ;1. Choose a value for R1 to get the highest signal voltage.\n2. Choose a low noise opamp with enough GBW\n3. Adjust C1 for flat frequency or pulse response (.AC and .TRAN)\n4. Run a noise analysis (.NOISE) over the BW of interest\nPlot V(onoise), Ctrl-LeftMouseButton on the plot label to get \nRMS-noise. Watch the noise peaking caused by the \ncapacitance at the amplifier input.\n \nRepeat steps 2 to 4 until it exceeds the requirement.\n \n(Optionally a DC-value in source I2 can be set to get shot noise,\nbut this effect can be neglected in the actual circuit design.)
TEXT 72 408 Left 0 ;universalopamp2.asy
TEXT -416 -448 Left 0 ;PHOTO DIODE WITH TRANSIMPEDANCE AMPLIFIER
TEXT -832 16 Left 0 ;D2 is an ideal diode V3 is an ac ammeter used\nto measure the shot noise \nB1 adds the diode current to the shot noise.
TEXT -392 -232 Left 0 !;op