Version 4 SHEET 1 1164 768 WIRE 224 -16 128 -16 WIRE 384 -16 224 -16 WIRE 480 -16 384 -16 WIRE 224 0 224 -16 WIRE 128 64 128 -16 WIRE 224 112 224 80 WIRE 240 112 224 112 WIRE 256 112 240 112 WIRE 352 112 320 112 WIRE 368 112 352 112 WIRE 224 128 224 112 WIRE 480 160 480 -16 WIRE 128 176 128 144 WIRE 144 176 128 176 WIRE 160 176 144 176 WIRE 16 208 0 208 WIRE 32 208 16 208 WIRE 128 208 128 176 WIRE 128 208 96 208 WIRE 224 240 224 224 WIRE 240 240 224 240 WIRE 288 240 240 240 WIRE 128 256 128 208 WIRE 224 256 224 240 WIRE 288 272 288 240 WIRE 128 368 128 336 WIRE 224 368 224 336 WIRE 288 368 288 336 WIRE 480 368 480 240 WIRE 16 496 16 208 WIRE 112 496 16 496 WIRE 352 496 352 112 WIRE 352 496 304 496 WIRE 384 576 304 576 WIRE 384 608 304 608 WIRE 384 640 304 640 FLAG 128 368 0 FLAG 224 368 0 FLAG 288 368 0 FLAG 0 208 amp_in FLAG 368 112 amp_out FLAG 480 368 0 FLAG 144 176 B FLAG 240 240 E FLAG 240 112 C FLAG 384 -16 VCC FLAG 384 576 amp_hl FLAG 384 608 amp_12 FLAG 384 640 ip3 SYMBOL npn 160 128 R0 SYMATTR InstName Q1 SYMATTR Value 2N2219A SYMBOL Misc\\EuropeanResistor 208 240 R0 SYMATTR InstName R1 SYMATTR Value 22 SYMBOL Misc\\EuropeanResistor 112 48 R0 SYMATTR InstName R2 SYMATTR Value 10k SYMBOL Misc\\EuropeanResistor 112 240 R0 SYMATTR InstName R3 SYMATTR Value 1k SYMBOL cap 272 272 R0 SYMATTR InstName C1 SYMATTR Value 100n SYMBOL Misc\\EuropeanResistor 208 -16 R0 SYMATTR InstName R4 SYMATTR Value 220 SYMBOL cap 32 224 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 0 32 VBottom 0 SYMATTR InstName C2 SYMATTR Value 1n SYMBOL cap 256 128 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 0 32 VBottom 0 SYMATTR InstName C3 SYMATTR Value 1n SYMBOL voltage 480 144 R0 SYMATTR InstName V1 SYMATTR Value 18V SYMBOL IP3_adapter-3 208 560 R0 WINDOW 39 -92 129 Left 0 SYMATTR Description IP3 measurement generator / analyzer ; Set source frequencies f1 and f2, source level Usrc, source resistance Rsrc and input resistance Rload. Set source frequencies to be an integer multiple of the spacing. Use transient analysis over at least t = 21/(f2- SYMATTR InstName X1 SYMATTR SpiceLine f1=7MegHz f2=7.1MegHz Usrc=77.5mV Rsrc=50 Rload=50 TEXT 568 384 Left 0 !.tran 0 130us 0 5n TEXT 568 192 Left 0 ;NOTE:\n* Set source frequencies to be an integer multiple of their spacing,\n e.g. not 6.95MHz and 7.05MHz, but rather 7.0MHz and 7.1MHz.\n* Source voltage Usrc is peak value (not rms) of one carrier.\n* Use transient analysis over at least t = 12/(f2-f1),\n or set the analysis time window by specifying tsta and tstp\n as additional attributes to the IP3 measurement box.\n* Set "Maximum Timestep" in transient analysis to < 1/20 of the\n carrier periode for increased accuracy. TEXT 568 664 Left 0 ;@Author\n2008-04-20 Andreas Czechanowski, DL4SDC TEXT 568 -16 Left 0 ;@Title\nTest circuit for the IP3 measurement box TEXT 568 416 Left 0 ;NOTE:\nResults of the measurements are presented as voltages:\n* amp_hl is the amplitude (V rms) of the higher of the two IM3 lines\n* amp_12 is the amplitude (V rms) of the lower of the two carrier lines\n* ip3 is the exprapolated IP3 level in dBm at 50 Ohms. TEXT 568 552 Left 0 ;Results:\nV1 = 12V => IP3 = 13.35dBm\nV1 = 18V => IP3 = 19.82dBm