Anybody know how this thing works? It seems to simulate ok but I'm unclear how 2 frequencies produce a difference frequency.with a gain of 30dB or more across the LC .The signal input is 640KHz at 1 millivolt and the oscillator frequency is 1095KHz at 500mV for a difference of 455KHz at 50mV.
Version 4 SHEET 1 912 680 WIRE -32 -224 -112 -224 WIRE 64 -224 -32 -224 WIRE 304 -224 64 -224 WIRE 432 -224 304 -224 WIRE -32 -192 -32 -224 WIRE 304 -192 304 -224 WIRE 432 -192 432 -224 WIRE 64 -176 64 -224 WIRE 64 -80 64 -96 WIRE 272 -80 64 -80 WIRE 608 -80 272 -80 WIRE 304 -48 304 -112 WIRE 304 -48 96 -48 WIRE 608 -48 608 -80 WIRE 608 -48 592 -48 WIRE 624 -48 608 -48 WIRE 304 -32 304 -48 WIRE 512 -32 304 -32 WIRE 592 -32 592 -48 WIRE 64 -16 64 -80 WIRE 96 -16 96 -48 WIRE 272 -16 272 -80 WIRE 304 -16 304 -32 WIRE -48 32 -240 32 WIRE 0 32 -48 32 WIRE 192 32 160 32 WIRE 208 32 192 32 WIRE 608 32 592 32 WIRE 624 32 608 32 WIRE 512 48 512 -32 WIRE 608 48 608 32 WIRE 608 48 512 48 WIRE 432 64 432 -112 WIRE 512 64 432 64 WIRE -112 80 -112 -224 WIRE 80 80 64 80 WIRE 96 80 80 80 WIRE 288 80 272 80 WIRE 304 80 288 80 WIRE 192 96 192 32 WIRE 432 96 432 64 WIRE 432 96 192 96 WIRE 432 112 432 96 WIRE -48 128 -48 32 WIRE 368 128 368 32 WIRE 368 128 -48 128 WIRE 512 128 512 64 WIRE 80 176 80 80 WIRE 288 176 288 80 WIRE -112 224 -112 160 WIRE 0 224 -112 224 WIRE 16 224 0 224 WIRE 400 224 352 224 WIRE -112 272 -112 224 WIRE 0 272 0 224 WIRE 80 288 80 272 WIRE 192 288 80 288 WIRE 288 288 288 272 WIRE 288 288 192 288 WIRE 400 288 400 224 WIRE 192 336 192 288 WIRE -112 448 -112 352 WIRE 0 448 0 336 WIRE 0 448 -112 448 WIRE 64 448 0 448 WIRE 192 448 192 416 WIRE 192 448 64 448 WIRE 64 464 64 448 FLAG -240 112 0 FLAG -32 -112 0 FLAG 400 368 0 FLAG 64 464 0 FLAG 432 192 0 FLAG 512 192 0 SYMBOL npn 0 -16 R0 WINDOW 0 118 -4 Left 0 WINDOW 3 -26 -14 Left 0 SYMATTR InstName Q1 SYMATTR Value 2N3904 SYMBOL npn 160 -16 M0 WINDOW 0 135 -42 Left 0 WINDOW 3 39 56 Left 0 SYMATTR InstName Q2 SYMATTR Value 2N3904 SYMBOL npn 208 -16 R0 WINDOW 0 40 32 Left 0 WINDOW 3 -29 -8 Left 0 SYMATTR InstName Q3 SYMATTR Value 2N3904 SYMBOL npn 368 -16 M0 WINDOW 0 38 32 Left 0 WINDOW 3 41 59 Left 0 SYMATTR InstName Q4 SYMATTR Value 2N3904 SYMBOL voltage -32 -208 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 0 -73 58 Left 0 WINDOW 3 -64 86 Left 0 SYMATTR InstName V1 SYMATTR Value 6 SYMBOL voltage -240 16 R0 WINDOW 3 -161 -18 Left 0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 0 -79 56 Left 0 SYMATTR Value SINE(3 .5 1095k 0 0 0 100) SYMATTR InstName V2 SYMBOL res 48 -192 R0 WINDOW 0 89 34 Left 0 WINDOW 3 53 35 Left 0 SYMATTR InstName R3 SYMATTR Value 3k SYMBOL res 288 -208 R0 SYMATTR InstName R4 SYMATTR Value 3k SYMBOL npn 352 176 M0 SYMATTR InstName Q5 SYMATTR Value 2N3904 SYMBOL npn 16 176 R0 SYMATTR InstName Q6 SYMATTR Value 2N3904 SYMBOL ind 608 -64 R0 SYMATTR InstName L1 SYMATTR Value .0003 SYMATTR SpiceLine Rser=5 SYMBOL cap 576 -32 R0 WINDOW 3 -48 5 Left 0 WINDOW 0 -35 40 Left 0 SYMATTR Value 400p SYMATTR InstName C1 SYMBOL res -128 256 R0 WINDOW 0 -32 34 Left 0 WINDOW 3 -31 61 Left 0 SYMATTR InstName R5 SYMATTR Value 10k SYMBOL voltage 400 272 M0 WINDOW 3 -195 166 Left 0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR Value SINE(1.48 .001 640k 0 0 0 100) SYMATTR InstName V4 SYMBOL res 176 320 R0 SYMATTR InstName R8 SYMATTR Value 510 SYMBOL res 416 -208 R0 SYMATTR InstName R1 SYMATTR Value 10k SYMBOL cap -16 272 R0 WINDOW 0 41 34 Left 0 WINDOW 3 35 56 Left 0 SYMATTR InstName C2
SYMBOL res 416 96 R0 SYMATTR InstName R6 SYMATTR Value 10k SYMBOL cap 496 128 R0 WINDOW 3 49 35 Left 0
SYMATTR InstName C3 SYMBOL res -128 64 R0 SYMATTR InstName R2 SYMATTR Value 30k TEXT -328 432 Left 0 !.tran .0001s
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