* Z:\home\khalils\Downloads\files\data\raw_asc\13c21c879a66_Demonstration_circuit_Noise_analysis___step.asc
* Generated by LTspice 26.0.1 for Windows.
* Demonstration Circuit Noise Analysis
* Noise as a function of tail current being stepped
* copyright Cordell Audio 12/03/2010
;op
;ac dec 10 10000 100000k
V2 0 N006 15
I1 N005 N006 2mA
R2 N001 Vout 2500
R3 N003 N005 225
V1 N001 0 15
Q2 Vout 0 N004 0 2N5551C
R4 N004 N005 225
Q1 N002 Vin N003 0 2N5551C
V3 Vin 0 SINE(0 0.1 1000 0 0 0 10) AC 1
C1 N001 Vout 100pF
R1 N001 N002 2500
.model NPN NPN
.model PNP PNP
.lib C:\users\khalils\AppData\Local\LTspice\lib\cmp\standard.bjt
.noise V(Vout) V3 dec 20 1k 100k
.option plotwinsize=0
.step I1 0.2mA 2mA 0.2mA
.include Cordell_Mods
.backanno
.end

* LTspice schematic (.asc):
Version 4
SHEET 1 880 780
WIRE 160 64 0 64
WIRE 272 64 160 64
WIRE 400 64 272 64
WIRE 0 112 0 64
WIRE 160 112 160 64
WIRE 272 112 272 64
WIRE 400 144 400 64
WIRE 160 208 160 192
WIRE 208 208 160 208
WIRE 272 208 272 176
WIRE 272 208 208 208
WIRE 0 256 0 192
WIRE 160 256 160 208
WIRE 400 288 400 224
WIRE 480 288 400 288
WIRE -128 304 -176 304
WIRE -64 304 -128 304
WIRE 400 304 400 288
WIRE 400 304 224 304
WIRE 480 304 480 288
WIRE 400 352 400 304
WIRE -176 368 -176 304
WIRE 0 384 0 352
WIRE 160 384 160 352
WIRE -176 496 -176 448
WIRE 0 496 0 464
WIRE 80 496 0 496
WIRE 160 496 160 464
WIRE 160 496 80 496
WIRE 80 512 80 496
WIRE 80 624 80 592
WIRE 400 624 400 432
WIRE 400 624 80 624
SYMBOL current 80 512 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 0 47 26 Left 0
WINDOW 3 36 64 Left 0
SYMATTR InstName I1
SYMATTR Value 2mA
SYMBOL res 144 368 R0
SYMATTR InstName R4
SYMATTR Value 225
SYMBOL res -16 368 R0
SYMATTR InstName R3
SYMATTR Value 225
SYMBOL voltage 400 128 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 0 39 33 Left 0
WINDOW 3 40 74 Left 0
SYMATTR InstName V1
SYMATTR Value 15
SYMBOL voltage 400 336 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 0 42 50 Left 0
WINDOW 3 45 86 Left 0
SYMATTR InstName V2
SYMATTR Value 15
SYMBOL res -16 96 R0
WINDOW 0 36 24 Left 0
WINDOW 3 34 60 Left 0
SYMATTR InstName R1
SYMATTR Value 2500
SYMBOL res 144 96 R0
WINDOW 0 36 25 Left 0
WINDOW 3 34 60 Left 0
SYMATTR InstName R2
SYMATTR Value 2500
SYMBOL npn 224 256 M0
WINDOW 0 68 17 Left 0
WINDOW 3 29 47 Left 0
SYMATTR InstName Q2
SYMATTR Value 2N5551C
SYMBOL cap 256 112 R0
WINDOW 3 36 42 Left 0
SYMATTR Value 100pF
SYMATTR InstName C1
SYMBOL voltage -176 352 R0
WINDOW 3 -325 103 Left 0
WINDOW 123 35 77 Left 0
WINDOW 39 0 0 Left 0
WINDOW 0 44 37 Left 0
SYMATTR Value SINE(0 0.1 1000 0 0 0 10)
SYMATTR Value2 AC 1
SYMATTR InstName V3
SYMBOL npn -64 256 R0
WINDOW 0 63 18 Left 0
WINDOW 3 26 47 Left 0
SYMATTR InstName Q1
SYMATTR Value 2N5551C
FLAG 480 304 0
FLAG -176 496 0
FLAG -128 304 Vin
FLAG 208 208 Vout
TEXT -680 48 Left 0 !;op
TEXT -680 80 Left 0 !;ac dec 10 10000 100000k
TEXT -184 -88 Left 0 ;Demonstration Circuit Noise Analysis
TEXT -680 160 Left 0 !.noise V(Vout) V3 dec 20 1k 100k
TEXT -680 120 Left 0 !.option plotwinsize=0
TEXT -680 200 Left 0 !.step I1 0.2mA 2mA 0.2mA
TEXT -248 -32 Left 0 ;Noise as a function of tail current being stepped
TEXT -680 16 Left 0 !.include Cordell_Mods
TEXT 120 760 Left 0 ;copyright Cordell Audio 12/03/2010