Version 4 SHEET 1 2344 2032 WIRE 944 928 784 928 WIRE 1392 928 944 928 WIRE 1744 928 1392 928 WIRE 1904 928 1744 928 WIRE 2000 928 1904 928 WIRE 1392 944 1392 928 WIRE 784 960 784 928 WIRE 2000 960 2000 928 WIRE 1024 976 992 976 WIRE 1136 976 1088 976 WIRE 1392 1040 1392 1024 WIRE 2000 1072 2000 1040 WIRE 784 1088 784 1040 WIRE 992 1088 992 976 WIRE 992 1088 784 1088 WIRE 1024 1088 992 1088 WIRE 1136 1088 1136 976 WIRE 1136 1088 1104 1088 WIRE 1168 1088 1136 1088 WIRE 1280 1088 1248 1088 WIRE 1328 1088 1280 1088 WIRE 1744 1120 1744 928 WIRE 1280 1168 1280 1088 WIRE 1296 1168 1280 1168 WIRE 1392 1168 1392 1136 WIRE 1392 1168 1360 1168 WIRE 1520 1168 1392 1168 WIRE 1616 1168 1520 1168 WIRE 1680 1168 1616 1168 WIRE 1392 1184 1392 1168 WIRE 1904 1200 1904 928 WIRE 1520 1232 1520 1168 WIRE 1616 1248 1616 1168 WIRE 1744 1248 1744 1216 WIRE 1840 1248 1744 1248 WIRE 1744 1264 1744 1248 WIRE 1392 1280 1392 1264 WIRE 1456 1280 1392 1280 WIRE 784 1312 784 1088 WIRE 944 1312 944 928 WIRE 624 1360 560 1360 WIRE 720 1360 704 1360 WIRE 1024 1360 1008 1360 WIRE 1088 1360 1024 1360 WIRE 1200 1360 1168 1360 WIRE 1232 1360 1200 1360 WIRE 1328 1360 1312 1360 WIRE 1744 1360 1744 1344 WIRE 1744 1360 1328 1360 WIRE 1904 1360 1904 1296 WIRE 1904 1360 1744 1360 WIRE 2080 1360 1904 1360 WIRE 1392 1376 1392 1280 WIRE 1024 1392 1024 1360 WIRE 2080 1392 2080 1360 WIRE 560 1408 560 1360 WIRE 1744 1440 1744 1360 WIRE 784 1456 784 1408 WIRE 864 1456 784 1456 WIRE 944 1456 944 1408 WIRE 944 1456 864 1456 WIRE 1392 1488 1392 1456 WIRE 1520 1488 1520 1328 WIRE 1520 1488 1392 1488 WIRE 1616 1488 1616 1312 WIRE 1616 1488 1520 1488 WIRE 1680 1488 1616 1488 WIRE 1024 1504 1024 1472 WIRE 1904 1504 1904 1360 WIRE 2080 1504 2080 1472 WIRE 864 1520 864 1456 WIRE 560 1536 560 1488 WIRE 1392 1536 1392 1488 WIRE 1744 1552 1744 1536 WIRE 1840 1552 1744 1552 WIRE 1744 1568 1744 1552 WIRE 864 1664 864 1600 WIRE 1392 1664 1392 1616 WIRE 1392 1664 864 1664 WIRE 1744 1664 1744 1648 WIRE 1744 1664 1392 1664 WIRE 1904 1664 1904 1600 WIRE 1904 1664 1744 1664 WIRE 2000 1664 1904 1664 WIRE 2000 1712 2000 1664 WIRE 2000 1808 2000 1792 FLAG 2000 1072 0 FLAG 2000 1808 0 FLAG 2080 1504 0 FLAG 1024 1504 0 FLAG 560 1536 0 FLAG 1328 1360 A FLAG 1200 1360 B FLAG 560 1360 IN SYMBOL NPN 1680 1120 R0 WINDOW 0 60 24 Left 2 WINDOW 3 60 68 Left 2 SYMATTR InstName Q5 SYMATTR Value 2N3904 SYMBOL npn 1840 1200 R0 SYMATTR InstName Q7 SYMATTR Value 2N2219A SYMBOL npn 1840 1504 R0 SYMATTR InstName Q8 SYMATTR Value 2N2219A SYMBOL PNP 1680 1536 M180 WINDOW 0 64 68 Left 2 WINDOW 3 68 28 Left 2 SYMATTR InstName Q6 SYMATTR Value 2N3906 SYMBOL VOLTAGE 2000 944 R0 SYMATTR InstName V1 SYMATTR Value 10 SYMBOL voltage 2000 1696 R0 SYMATTR InstName V2 SYMATTR Value -10 SYMBOL RES 1376 1520 R0 SYMATTR InstName R11 SYMATTR Value 5K SYMBOL res 2064 1376 R0 SYMATTR InstName R14 SYMATTR Value 8 SYMBOL res 1376 1168 R0 SYMATTR InstName R9 SYMATTR Value 2K SYMBOL res 1376 1360 R0 SYMATTR InstName R10 SYMATTR Value 1K SYMBOL npn 1456 1232 R0 SYMATTR InstName Q4 SYMATTR Value 2N3904 SYMBOL npn 720 1312 R0 WINDOW 0 54 32 Left 2 WINDOW 3 52 69 Left 2 SYMATTR InstName Q1 SYMATTR Value 2N3904 SYMBOL npn 1008 1312 M0 WINDOW 0 54 32 Left 2 WINDOW 3 51 65 Left 2 SYMATTR InstName Q2 SYMATTR Value 2N3904 SYMBOL res 768 944 R0 SYMATTR InstName R2 SYMATTR Value 200 SYMBOL res 848 1504 R0 SYMATTR InstName R3 SYMATTR Value 1K SYMBOL pnp 1328 1136 M180 WINDOW 0 72 68 Left 2 WINDOW 3 72 28 Left 2 SYMATTR InstName Q3 SYMATTR Value 2N3906 SYMBOL res 1008 1376 R0 SYMATTR InstName R6 SYMATTR Value 5K SYMBOL res 1184 1344 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R7 SYMATTR Value 50K SYMBOL voltage 560 1392 R0 SYMATTR InstName V3 SYMATTR Value SINE(0 .7 1K) SYMBOL res 720 1344 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1 SYMATTR Value 5K SYMBOL res 1376 928 R0 SYMATTR InstName R8 SYMATTR Value 100 SYMBOL res 1120 1072 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 9K SYMBOL cap 1360 1152 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C2 SYMATTR Value 100p SYMBOL cap 1088 960 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C1 SYMATTR Value 10p SYMBOL res 1728 1552 R0 SYMATTR InstName R13 SYMATTR Value 1K SYMBOL res 1728 1248 R0 SYMATTR InstName R12 SYMATTR Value 1K SYMBOL cap 1600 1248 R0 SYMATTR InstName C3 SYMATTR Value .001µ SYMBOL res 1264 1072 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value 1K SYMBOL voltage 1328 1360 R90 WINDOW 0 -32 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName V4 SYMATTR Value AC 1 TEXT 976 1752 Left 2 !.tran 10m TEXT 976 1784 Left 2 !.options maxstep=10u TEXT 976 1848 Left 2 ;.ac oct 10 1 100Meg TEXT 560 1712 Left 2 ;To look at gain and phase margins:\n i) comment the .tran line\n ii) uncomment the .ac line\n iv) re-run the simulation\n iii) plot V(A)/V(B) TEXT 1248 1872 Top 1 ;This example schematic is supplied for informational/educational purposes only. TEXT 976 1816 Left 2 !.fourier 1K V(a) TEXT 1160 1816 Left 2 ;<-- To see the output of a .four statement, select View=>Spice Error Log