Version 4 SHEET 1 4504 2740 WIRE 2704 256 1664 256 WIRE 2848 256 2704 256 WIRE 2848 288 2560 288 WIRE 3792 304 3072 304 WIRE 3872 304 3792 304 WIRE 2848 320 2416 320 WIRE 1664 336 1664 256 WIRE 2848 352 2816 352 WIRE 3792 368 3792 304 WIRE 2704 480 2704 256 WIRE 2848 480 2704 480 WIRE 2560 512 2560 288 WIRE 2560 512 1664 512 WIRE 2848 512 2560 512 WIRE 3792 528 3792 448 WIRE 3792 528 3072 528 WIRE 2416 544 2416 320 WIRE 2848 544 2416 544 WIRE 2848 576 2816 576 WIRE 3792 592 3792 528 WIRE 1024 608 1024 576 WIRE 1664 608 1664 512 WIRE 2704 720 2704 480 WIRE 2848 720 2704 720 WIRE 2560 752 2560 512 WIRE 2848 752 2560 752 WIRE 3792 768 3792 672 WIRE 3792 768 3072 768 WIRE 2416 784 2416 544 WIRE 2416 784 1664 784 WIRE 2848 784 2416 784 WIRE 1024 816 1024 784 WIRE 2848 816 2816 816 WIRE 1664 880 1664 784 WIRE 3792 880 3792 768 WIRE 3792 992 3792 960 WIRE 1024 1040 1024 1008 FLAG 1664 416 0 FLAG 1664 688 0 FLAG 1664 960 0 FLAG 2816 352 BIT0 IOPIN 2816 352 In FLAG 2816 576 BIT1 IOPIN 2816 576 In FLAG 2816 816 BIT2 IOPIN 2816 816 In FLAG 1024 576 BIT0 FLAG 1024 784 BIT1 FLAG 1024 688 0 FLAG 1024 896 0 FLAG 1024 1008 BIT2 FLAG 1024 1120 0 FLAG 3792 992 0 FLAG 3936 304 VOUT IOPIN 3936 304 In SYMBOL voltage 1664 320 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 WINDOW 0 41 47 Left 2 WINDOW 3 43 69 Left 2 SYMATTR InstName VDD SYMATTR Value 3 SYMBOL voltage 1664 592 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 WINDOW 0 38 48 Left 2 WINDOW 3 37 73 Left 2 SYMATTR InstName DACBIAS1 SYMATTR Value 0.75 SYMBOL voltage 1664 864 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 WINDOW 0 39 42 Left 2 WINDOW 3 37 71 Left 2 SYMATTR InstName DACBIAS2 SYMATTR Value 0.75 SYMBOL Switchable_Current_Source 2960 304 R0 SYMATTR InstName X0 SYMBOL Switchable_Current_Source 2960 528 R0 SYMATTR InstName X1 SYMBOL Switchable_Current_Source 2960 768 R0 SYMATTR InstName X2 SYMBOL voltage 1024 592 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 WINDOW 0 38 44 Left 2 WINDOW 3 38 71 Left 2 SYMATTR InstName BIT0 SYMATTR Value PULSE(0 3 0 50n 50n 950n 2000n) SYMBOL voltage 1024 800 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 WINDOW 0 38 38 Left 2 WINDOW 3 40 65 Left 2 SYMATTR InstName BIT1 SYMATTR Value PULSE(0 3 0 50n 50n 1950n 4000n) SYMBOL voltage 1024 1024 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 WINDOW 0 38 44 Left 2 WINDOW 3 38 71 Left 2 SYMATTR InstName BIT2 SYMATTR Value PULSE(0 3 0 50n 50n 3950n 8000n) SYMBOL res 3776 352 R0 SYMATTR InstName R1 SYMATTR Value 120 SYMBOL res 3776 576 R0 SYMATTR InstName R2 SYMATTR Value 120 SYMBOL res 3776 864 R0 SYMATTR InstName R3 SYMATTR Value 120 TEXT 1840 1352 Left 2 !.include cmosedu_models.txt TEXT 1944 1208 Left 2 !.tran 1