Version 4 SHEET 1 924 680 WIRE 80 -144 0 -144 WIRE 240 -144 80 -144 WIRE 304 -144 240 -144 WIRE 416 -144 304 -144 WIRE 0 -80 0 -144 WIRE 240 -16 240 -144 WIRE 80 0 80 -144 WIRE 128 0 80 0 WIRE 128 16 128 0 WIRE -240 48 -288 48 WIRE -240 64 -240 48 WIRE 240 80 240 64 WIRE 288 80 240 80 WIRE 432 80 352 80 WIRE 240 96 240 80 WIRE 352 112 352 80 WIRE -288 144 -288 48 WIRE -288 144 -544 144 WIRE -240 144 -240 128 WIRE -144 144 -240 144 WIRE -32 144 -144 144 WIRE 128 144 128 96 WIRE 128 144 48 144 WIRE 176 144 128 144 WIRE -544 160 -544 144 WIRE -288 160 -288 144 WIRE -240 160 -240 144 WIRE 240 224 240 192 WIRE 352 224 352 192 WIRE 352 224 240 224 WIRE -144 240 -144 224 WIRE -544 256 -544 240 WIRE 352 256 352 224 WIRE -240 272 -240 240 WIRE -144 272 -240 272 WIRE 80 272 80 0 WIRE 128 272 80 272 WIRE 240 272 128 272 WIRE -240 288 -240 272 WIRE 128 288 128 272 WIRE -288 352 -288 240 WIRE -240 352 -288 352 WIRE 288 352 240 352 WIRE 432 352 352 352 WIRE 352 368 352 352 WIRE -288 400 -288 352 WIRE -144 400 -288 400 WIRE -32 400 -144 400 WIRE 128 400 128 368 WIRE 128 400 48 400 WIRE 176 400 128 400 WIRE 240 480 240 448 WIRE 352 480 352 448 WIRE 352 480 240 480 WIRE -144 496 -144 480 WIRE 352 512 352 480 FLAG -544 256 0 FLAG -144 352 0 FLAG 0 0 0 FLAG 432 80 Q IOPIN 432 80 Out FLAG 432 352 I IOPIN 432 352 Out FLAG 416 -80 0 FLAG 352 256 0 FLAG 352 512 0 FLAG -144 240 0 FLAG -144 496 0 FLAG 304 -80 0 SYMBOL ind2 -304 256 M180 WINDOW 0 -15 80 Right 0 WINDOW 3 -7 42 Right 0 SYMATTR InstName L1 SYMATTR Value 1.14µ SYMATTR Type ind SYMBOL ind2 -224 256 R180 WINDOW 0 -3 80 Right 0 WINDOW 3 3 32 Right 0 SYMATTR InstName L2 SYMATTR Value 1.14µ SYMATTR Type ind SYMBOL Misc\\signal -544 144 R0 WINDOW 3 24 104 Invisible 0 WINDOW 123 24 132 Left 0 WINDOW 39 24 160 Left 0 WINDOW 0 -10 -23 Left 0 SYMATTR Value SINE(0 1 7MHz) SYMATTR Value2 AC 4 SYMATTR SpiceLine Rser=50 SYMATTR InstName rf_sweep_generator SYMBOL cap -256 64 R0 SYMATTR InstName C1 SYMATTR Value 227p SYMBOL cap -256 288 R0 SYMATTR InstName C2 SYMATTR Value 227p SYMBOL res -160 256 R0 SYMATTR InstName R1 SYMATTR Value 50 SYMBOL res -160 128 R0 SYMATTR InstName R2 SYMATTR Value 50 SYMBOL res -160 384 R0 SYMATTR InstName R3 SYMATTR Value 50 SYMBOL npn 176 96 R0 WINDOW 0 40 42 Left 0 SYMATTR InstName Q1 SYMATTR Value 2N5089 SYMBOL voltage 0 -96 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 12 SYMBOL npn 176 352 R0 WINDOW 0 40 41 Left 0 SYMATTR InstName Q2 SYMATTR Value 2N5089 SYMBOL res 224 -32 R0 SYMATTR InstName R8 SYMATTR Value 1k SYMBOL res 224 256 R0 SYMATTR InstName R9 SYMATTR Value 1k SYMBOL res 336 96 R0 WINDOW 3 36 78 Left 0 SYMATTR Value 5k SYMATTR InstName R10 SYMBOL res 336 352 R0 SYMATTR InstName R11 SYMATTR Value 5k SYMBOL res 64 128 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R4 SYMATTR Value 1k SYMBOL res 64 384 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R5 SYMATTR Value 1k SYMBOL res 112 0 R0 SYMATTR InstName R6 SYMATTR Value 16.5k SYMBOL res 112 272 R0 SYMATTR InstName R7 SYMATTR Value 16.5k SYMBOL cap 400 -144 R0 WINDOW 3 46 37 Left 0 SYMATTR Value 1000µ SYMATTR InstName C4 SYMBOL cap 288 -144 R0 WINDOW 0 -33 34 Left 0 WINDOW 3 46 35 Left 0 SYMATTR InstName C3 SYMATTR Value 0.01µ SYMBOL cap 352 64 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 39 46 VTop 0 SYMATTR InstName C5 SYMATTR Value 0.001µ SYMBOL cap 352 336 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 37 49 VTop 0 SYMATTR InstName C6 SYMATTR Value 0.001µ TEXT -192 88 Left 0 !K1 L1 L2 1 TEXT -696 -184 Left 0 ;90 degree phase splitter transformer with 2N5089 gain follower TEXT -696 -144 Left 0 ;design Dannie Jackson ka9rza ~ wavelengths@netzero.com TEXT -568 464 Left 0 ;center frequency 7 MHz TEXT -568 504 Left 0 ;insertion loss = -1.073 dB TEXT -592 72 Left 0 ;50 ohms IN TEXT -288 560 Left 0 ;R10 & R11 represent a load into a following mixer stage of 2K to 5K. TEXT -696 -56 Left 0 ;This is an SDR I-Q circuit. TEXT -664 360 Left 0 !.ac oct 1000 6.5meg 7.5meg TEXT 88 192 Left 0 ;bias = 0.7v TEXT 72 432 Left 0 ;bias = 0.7v TEXT 400 40 Left 0 ;+139.8 degrees TEXT 400 312 Left 0 ;+49.8 degrees TEXT -144 384 Left 0 ;-45 degrees TEXT -168 120 Left 0 ;+45 degrees TEXT 432 184 Left 0 ;139.8 - 49.8\n = 90 degrees