Version 4.1
SHEET 1 1216 920
WIRE 16 80 -304 80
WIRE 48 80 16 80
WIRE 336 80 304 80
WIRE 432 80 336 80
WIRE -928 96 -1024 96
WIRE -672 96 -848 96
WIRE -512 96 -672 96
WIRE -384 96 -512 96
WIRE -304 96 -304 80
WIRE 432 96 432 80
WIRE -1024 112 -1024 96
WIRE -512 112 -512 96
WIRE 48 112 48 80
WIRE 48 112 -16 112
WIRE 128 112 48 112
WIRE -384 144 -384 96
WIRE -16 144 -16 112
WIRE 128 144 128 112
WIRE 656 144 544 144
WIRE 544 176 544 144
WIRE -304 192 -304 176
WIRE -192 192 -304 192
WIRE 432 208 432 176
WIRE 432 208 336 208
WIRE -1024 224 -1024 192
WIRE -640 224 -1024 224
WIRE -512 224 -512 192
WIRE -512 224 -640 224
WIRE -384 224 -512 224
WIRE -304 224 -304 192
WIRE 128 224 128 208
WIRE 304 224 304 80
WIRE 304 224 128 224
WIRE -640 240 -640 224
WIRE -16 240 -16 208
WIRE 304 240 -16 240
WIRE 432 240 432 208
WIRE -928 272 -1008 272
WIRE -704 272 -848 272
WIRE -576 272 -704 272
WIRE -16 272 -16 240
WIRE 128 272 128 224
WIRE -1008 288 -1008 272
WIRE 544 304 544 256
WIRE -576 336 -576 272
WIRE -192 336 -192 192
WIRE -192 336 -576 336
WIRE -16 352 -16 336
WIRE 48 352 -16 352
WIRE 128 352 128 336
WIRE 128 352 48 352
WIRE 304 352 304 240
WIRE 384 352 304 352
WIRE 432 352 432 320
WIRE 432 352 384 352
WIRE 336 384 336 208
WIRE -1008 400 -1008 368
WIRE -304 400 -304 304
WIRE 32 400 -304 400
WIRE 48 400 48 352
WIRE 48 400 32 400
FLAG -640 240 0
FLAG -704 272 Local_oscillator_input
FLAG 544 304 0
FLAG 16 80 LO_plus_audio
FLAG 32 400 LO_minus_audio
FLAG 336 80 right
FLAG 384 352 left
FLAG -1008 400 0
FLAG 336 384 0
FLAG 656 144 output
FLAG -672 96 audio_input
SYMBOL diode 112 144 R0
WINDOW 3 41 36 Left 2
SYMATTR Value IdealDiode
SYMATTR InstName D3
SYMBOL diode 112 272 R0
SYMATTR InstName D4
SYMATTR Value IdealDiode
SYMBOL diode 0 208 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Invisible 2
SYMATTR InstName D1
SYMATTR Value IdealDiode
SYMBOL diode 0 336 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Invisible 2
SYMATTR InstName D2
SYMATTR Value IdealDiode
SYMBOL ind2 -400 128 R0
SYMATTR InstName L1
SYMATTR Value 100m
SYMATTR Type ind
SYMBOL ind2 -320 80 R0
SYMATTR InstName L2
SYMATTR Value 100m
SYMATTR Type ind
SYMBOL ind2 -320 208 R0
SYMATTR InstName L3
SYMATTR Value 100m
SYMATTR Type ind
SYMBOL voltage -1008 272 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 3 -72 110 Left 2
SYMATTR Value PULSE(0 2 0 10n 10n 5u 10u)
SYMATTR InstName V1
SYMBOL res -528 96 R0
SYMATTR InstName R1
SYMATTR Value 1Meg
SYMBOL res -944 80 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 100R
SYMBOL ind2 416 80 R0
SYMATTR InstName L4
SYMATTR Value 1m
SYMATTR Type ind
SYMBOL ind2 416 224 R0
SYMATTR InstName L5
SYMATTR Value 1m
SYMATTR Type ind
SYMBOL ind2 528 160 R0
SYMATTR InstName L6
SYMATTR Value 1m
SYMATTR Type ind
SYMBOL voltage -1024 96 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value SINE(0 0.2 1khz)
SYMBOL res -944 256 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 1R
TEXT -416 48 Left 2 !K1 L1 L2 L3 1
TEXT 424 48 Left 2 !K2 L4 L5 L6 1
TEXT -832 536 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 "output" to plot it, \nclick on the graph window, then on view/fft\nin the window that opens click on "output" then on OK,\nthe fft graph window will appear,\nzoom to the frequencies at about 100khz.\nthere are 2 1kz sidebands and no carrier
TEXT 104 864 Left 2 !.model IdealDiode D(Ron=1 Roff=10Meg Vfwd=.4)
TEXT 112 832 Left 2 !.tran 0 100m 10m
TEXT -440 0 Left 2 ;transformer_1
TEXT 440 0 Left 2 ;transformer_2
TEXT -832 488 Left 4 ;instructions
TEXT -808 -136 Left 5 ;4 diode balanced mixer producing suppressed carrier
TEXT -40 520 Left 2 ;this circuit shows the mixer used as audio to IF, \nby changing the audio input to an Rf input it becomes \neither Rf to IF, or Rf to baseband\n \nthe transformers are created by using the Spice coupling coefficient K
TEXT -960 -16 Left 3 ;Inputs
TEXT -56 -56 Left 3 ;Mixer
TEXT -744 -256 Left 2 ;Mixer circuits with four diodes, \n this type of mixer circuit produces the desired sum and difference frequencies at its output, \n and it does not produces either of its two input frequencies at its output
RECTANGLE Normal -256 320 -464 16 2
RECTANGLE Normal 624 384 400 16 2
RECTANGLE Normal -736 432 -1088 16 2
RECTANGLE Normal 640 400 -544 -32 2