Version 4.1
SHEET 1 908 1064
WIRE -96 80 -304 80
WIRE -16 80 -96 80
WIRE -1104 96 -1184 96
WIRE -768 96 -1024 96
WIRE -384 96 -768 96
WIRE -304 96 -304 80
WIRE -1184 112 -1184 96
WIRE -384 144 -384 96
WIRE -16 144 -16 80
WIRE -304 192 -304 176
WIRE -176 192 -304 192
WIRE -304 224 -304 192
WIRE -1184 240 -1184 192
WIRE -384 240 -384 224
WIRE -384 240 -1184 240
WIRE -16 240 -16 208
WIRE 64 240 -16 240
WIRE 304 240 64 240
WIRE -1184 256 -1184 240
WIRE -16 272 -16 240
WIRE -1088 304 -1184 304
WIRE -816 304 -1008 304
WIRE -544 304 -816 304
WIRE 64 304 64 240
WIRE -1184 336 -1184 304
WIRE -544 368 -544 304
WIRE -176 368 -176 192
WIRE -176 368 -544 368
WIRE -304 400 -304 304
WIRE -64 400 -304 400
WIRE -16 400 -16 336
WIRE -16 400 -64 400
WIRE 64 432 64 384
WIRE -1184 448 -1184 416
FLAG -1184 256 0
FLAG -768 96 Local_oscillator_input
FLAG -1184 448 0
FLAG -96 80 top
FLAG -64 400 bottom
FLAG 304 240 RF_out
FLAG -816 304 Audio_input
FLAG 64 432 0
SYMBOL diode 0 208 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value IdealDiode
SYMBOL diode 0 336 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D2
SYMATTR Value IdealDiode
SYMBOL ind2 -400 128 R0
SYMATTR InstName L1
SYMATTR Value 1m
SYMATTR Type ind
SYMBOL ind2 -320 80 R0
SYMATTR InstName L2
SYMATTR Value 1m
SYMATTR Type ind
SYMBOL ind2 -288 208 M0
SYMATTR InstName L3
SYMATTR Value 1m
SYMATTR Type ind
SYMBOL voltage -1184 96 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 3 -72 110 Left 2
SYMATTR Value PULSE(0 1 0 2u 2u 3u 10u)
SYMATTR InstName V1
SYMBOL res -1008 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 50R
SYMBOL voltage -1184 320 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value SINE(0 0.5 1khz)
SYMBOL res -992 288 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 50R
SYMBOL res 48 288 R0
SYMATTR InstName R1
SYMATTR Value 100k
TEXT -416 48 Left 2 !K1 L1 L2 L3 1
TEXT -1144 528 Left 2 ;click on run,\nclick on "Local_oscillator_input" to plot it, \nclick on the graph window, then on plot settings/add plot pane\nclick on "audio_input" to plot it, \nclick on the graph window, then on plot settings/add plot pane\nclick on "RF_out" to plot it, \nclick on the graph window, then on view/fft\nclick on "RF_out" then on OK,\nthe fft window will appear,\nzoom to the frequencies at about 100khz.\nthere are 2 1kz sidebands and no carrier
TEXT -176 728 Left 2 !.model IdealDiode D(Ron=1 Roff=10Meg Vfwd=.4)
TEXT -176 760 Left 2 !.tran 0 100m 10m
TEXT -400 0 Left 2 ;transformer
TEXT -1144 496 Left 4 ;instructions
TEXT -936 -168 Left 5 ;2 diode mixer, used as modulator
TEXT -1152 880 Left 2 ;the transformer is created by using the Spice coupling coefficient K
TEXT -968 -120 Left 2 ;this is a balanced mixer, that is there are two sidebands but no carrier present in the RF out.
TEXT -408 -40 Left 4 ;Mixer
TEXT -1168 -40 Left 4 ;Inputs
TEXT -960 -288 Left 2 ;Mixer circuits with two diodes, \n this type of mixer circuit produces the desired sum and difference frequencies at its output, \n however it also produces one of its two input frequencies at its output
RECTANGLE Normal -240 320 -448 16 2
RECTANGLE Normal 160 432 -608 -16 2
RECTANGLE Normal -944 464 -1280 -16 2