Version 4 SHEET 1 2748 1632 WIRE 2112 864 2112 848 WIRE 2112 864 2000 864 WIRE 2224 864 2112 864 WIRE 2000 880 2000 864 WIRE 2224 880 2224 864 WIRE 2000 976 2000 960 WIRE 2368 976 2000 976 WIRE 2224 1024 2224 960 WIRE 2368 1024 2224 1024 WIRE 2000 1056 2000 976 WIRE 2224 1056 2224 1024 WIRE 1840 1104 1760 1104 WIRE 1936 1104 1920 1104 WIRE 2336 1104 2288 1104 WIRE 2336 1120 2336 1104 WIRE 2496 1120 2496 1104 WIRE 2624 1120 2624 1104 WIRE 1760 1136 1760 1104 WIRE 2000 1184 2000 1152 WIRE 2112 1184 2000 1184 WIRE 2224 1184 2224 1152 WIRE 2224 1184 2112 1184 WIRE 2112 1200 2112 1184 WIRE 2496 1216 2496 1200 WIRE 2624 1216 2624 1200 WIRE 2336 1232 2336 1200 WIRE 1760 1248 1760 1216 WIRE 2112 1312 2112 1280 FLAG 2496 1216 0 FLAG 2624 1216 0 FLAG 1760 1248 0 FLAG 2624 1104 -V FLAG 2496 1104 +V FLAG 2112 1312 -V FLAG 2112 848 +V FLAG 2368 976 OUT- FLAG 2368 1024 OUT+ FLAG 2336 1232 0 SYMBOL voltage 2496 1104 R0 SYMATTR InstName V2 SYMATTR Value {V} SYMBOL voltage 2624 1104 R0 SYMATTR InstName V3 SYMATTR Value {-V} SYMBOL res 1936 1088 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1 SYMATTR Value 1K SYMBOL voltage 1760 1120 R0 WINDOW 3 37 57 Left 2 WINDOW 39 0 0 Left 2 WINDOW 123 24 104 Left 2 SYMATTR Value 0 SYMATTR Value2 AC 1 SYMATTR InstName V1 SYMBOL npn 1936 1056 R0 SYMATTR InstName Q1 SYMATTR Value 2N2222 SYMBOL npn 2288 1056 M0 SYMATTR InstName Q2 SYMATTR Value 2N2222 SYMBOL res 1984 864 R0 SYMATTR InstName R3 SYMATTR Value 1K SYMBOL res 2208 864 R0 SYMATTR InstName R4 SYMATTR Value 1K SYMBOL res 2096 1184 R0 SYMATTR InstName R5 SYMATTR Value {R} SYMBOL res 2320 1104 R0 SYMATTR InstName R2 SYMATTR Value 1K TEXT 2216 1352 Left 2 !.NOISE V(out+,out-) V1 list 10K TEXT 2216 1288 Left 2 !.param V=15 TEXT 2216 1320 Left 2 !.step oct param R 500 100K 10 TEXT 1696 1408 Left 2 ;This example demonstrates .stepping a global parameter, R, while computing\nthe noise at a single frequency. The resultant plot of V(inoise_density) vs. R\nshows a minimun noise with a tail resistance around 16kOhms. TEXT 2112 1512 Top 1 ;This example schematic is supplied for informational/educational purposes only.