Version 4 SHEET 1 3200 1748 WIRE 1136 -688 1088 -688 WIRE 1328 -688 1216 -688 WIRE 1424 -688 1328 -688 WIRE 1328 -656 1328 -688 WIRE 1424 -624 1424 -688 WIRE 1728 -624 1424 -624 WIRE 1328 -576 1328 -592 WIRE 1728 -560 1424 -560 WIRE 1136 -496 1088 -496 WIRE 1328 -496 1216 -496 WIRE 1424 -496 1424 -560 WIRE 1424 -496 1328 -496 WIRE 1328 -464 1328 -496 WIRE 1328 -384 1328 -400 WIRE 2352 -288 2256 -288 WIRE 2544 -288 2416 -288 WIRE 2256 -192 2256 -288 WIRE 2352 -192 2256 -192 WIRE 2544 -192 2544 -288 WIRE 2544 -192 2432 -192 WIRE 1120 -112 976 -112 WIRE 1312 -112 1200 -112 WIRE 1568 -112 1312 -112 WIRE 1680 -96 1632 -96 WIRE 1744 -96 1680 -96 WIRE 2256 -96 2256 -192 WIRE 2256 -96 1824 -96 WIRE 1312 -80 1312 -112 WIRE 1568 -80 1520 -80 WIRE -272 -48 -352 -48 WIRE 16 -48 -192 -48 WIRE 2256 -48 2256 -96 WIRE 2368 -48 2256 -48 WIRE 2432 -32 2416 -32 WIRE 2544 -32 2544 -192 WIRE 2544 -32 2432 -32 WIRE 2608 -32 2544 -32 WIRE 1600 -16 1600 -64 WIRE 2368 -16 2304 -16 WIRE -96 0 -208 0 WIRE 1312 0 1312 -16 WIRE 1520 48 1520 -80 WIRE 1600 48 1520 48 WIRE 1680 48 1680 -96 WIRE -352 64 -352 -48 WIRE -272 64 -352 64 WIRE 16 64 -192 64 WIRE -352 112 -352 64 WIRE -352 112 -640 112 WIRE -96 112 -208 112 WIRE 1520 144 1520 128 WIRE 1600 144 1520 144 WIRE -352 176 -352 112 WIRE -272 176 -352 176 WIRE 16 176 -192 176 WIRE -96 224 -208 224 WIRE 1600 256 1600 208 WIRE 1520 272 1520 144 WIRE 1568 272 1520 272 WIRE -352 288 -352 176 WIRE -272 288 -352 288 WIRE 16 288 -192 288 WIRE 1680 288 1680 144 WIRE 1680 288 1632 288 WIRE 1744 288 1680 288 WIRE 2304 288 2304 -16 WIRE 2304 288 1824 288 WIRE 2400 288 2304 288 WIRE 1120 304 976 304 WIRE 1312 304 1200 304 WIRE 1568 304 1312 304 WIRE -96 336 -208 336 WIRE 1312 336 1312 304 WIRE 2352 368 2304 368 WIRE 2400 368 2400 352 WIRE 2400 368 2352 368 WIRE 2352 400 2352 368 WIRE 1312 416 1312 400 WIRE -624 800 -736 800 WIRE 336 800 224 800 WIRE -736 832 -736 800 WIRE 224 832 224 800 WIRE 1424 848 1360 848 WIRE 1600 848 1504 848 WIRE 1952 848 1952 832 WIRE 1952 848 1872 848 WIRE 1952 864 1952 848 WIRE 1360 880 1360 848 WIRE 1872 880 1872 848 WIRE -624 992 -736 992 WIRE 336 992 224 992 WIRE -736 1024 -736 992 WIRE 224 1024 224 992 WIRE 1424 1136 1360 1136 WIRE 1600 1136 1504 1136 WIRE 1360 1168 1360 1136 FLAG -256 0 0 FLAG -256 112 0 FLAG -256 224 0 FLAG -256 336 0 FLAG 1360 880 0 FLAG 1952 752 +5V FLAG 1872 880 0 FLAG 1952 944 -5V FLAG -96 0 V_0_deg FLAG -96 112 V_90_deg FLAG -96 224 V_180_deg FLAG -96 336 V_270_deg FLAG -736 912 0 FLAG -624 800 V_0_deg FLAG -736 1104 0 FLAG -624 992 V_90_deg FLAG 224 912 0 FLAG 336 800 V_180_deg FLAG 224 1104 0 FLAG 336 992 V_270_deg FLAG 16 -48 00 FLAG 16 176 11 FLAG 1600 848 V_filtered FLAG -640 112 V_filtered FLAG 1312 416 0 FLAG 1312 0 0 FLAG 16 64 01 FLAG 16 288 10 FLAG 1328 -384 0 FLAG 1328 -576 0 FLAG 1088 -496 11 FLAG 1088 -688 00 FLAG 1360 1168 0 FLAG 1600 1136 V_filtered90 FLAG 976 304 10 FLAG 976 -112 01 FLAG 2400 -64 +5V FLAG 2400 0 -5V FLAG 1600 -16 +5V FLAG 1600 -128 -5V FLAG 1600 320 -5V FLAG 2352 400 0 FLAG 2608 -32 V_o FLAG 1600 208 +5V SYMBOL sw -288 -48 R270 SYMATTR InstName S7 SYMATTR Value MYSW SYMBOL sw -288 64 R270 SYMATTR InstName S2 SYMATTR Value MYSW SYMBOL sw -288 176 R270 SYMATTR InstName S4 SYMATTR Value MYSW SYMBOL sw -288 288 R270 SYMATTR InstName S6 SYMATTR Value MYSW SYMBOL voltage 1520 848 R90 WINDOW 0 -32 56 VBottom 2 WINDOW 3 32 56 VTop 2 WINDOW 123 118 56 VBottom 2 WINDOW 39 90 56 VBottom 2 SYMATTR InstName V3 SYMATTR Value SINE(0 5u {RF_Freq}) SYMATTR Value2 AC 1 SYMATTR SpiceLine Rser=50 SYMBOL voltage 1952 736 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V4 SYMATTR Value 5 SYMBOL voltage 1952 848 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V5 SYMATTR Value 5 SYMBOL voltage -736 816 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value PULSE(0 1 0 0.001p 0.001p {SW_time} {4*SW_time}) SYMBOL voltage -736 1008 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V2 SYMATTR Value PULSE(0 1 {SW_time} 0.001p 0.001p {SW_time} {4*SW_time}) SYMBOL voltage 224 816 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V6 SYMATTR Value PULSE(0 1 {2*SW_time} 0.001p 0.001p {SW_time} {4*SW_time}) SYMBOL voltage 224 1008 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V7 SYMATTR Value PULSE(0 1 {3*SW_time} 0.001p 0.001p {SW_time} {4*SW_time}) SYMBOL cap 1328 -16 R180 WINDOW 0 24 56 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C1 SYMATTR Value {C_Sample} SYMBOL cap 1328 400 R180 WINDOW 0 24 56 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C7 SYMATTR Value {C_Sample} SYMBOL res 1216 -128 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R24 SYMATTR Value 1 SYMBOL res 1216 288 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R25 SYMATTR Value 1 SYMBOL cap 1344 -592 R180 WINDOW 0 24 56 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C3 SYMATTR Value {C_Sample} SYMBOL cap 1344 -400 R180 WINDOW 0 24 56 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C13 SYMATTR Value {C_Sample} SYMBOL res 1232 -704 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value 1 SYMBOL res 1232 -512 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R7 SYMATTR Value 1 SYMBOL voltage 1520 1136 R90 WINDOW 0 -32 56 VBottom 2 WINDOW 3 32 56 VTop 2 WINDOW 123 118 56 VBottom 2 WINDOW 39 90 56 VBottom 2 SYMATTR InstName V8 SYMATTR Value SINE(0 5u {RF_Freq} 0 0 180) SYMATTR Value2 AC 1 SYMATTR SpiceLine Rser=50 SYMBOL res 2448 -208 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1 SYMATTR Value 82k SYMBOL Opamps\\UniversalOpamp2 2400 -32 R0 SYMATTR InstName U1 SYMATTR SpiceModel level.1 SYMATTR Value2 Avol=1Meg GBW=100Meg Slew=100Meg SYMBOL cap 2416 -304 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C2 SYMATTR Value 10p SYMBOL Opamps\\UniversalOpamp2 1600 288 R0 SYMATTR InstName U2 SYMATTR SpiceModel level.1 SYMATTR Value2 Avol=1Meg GBW=100Meg Slew=100Meg SYMBOL Opamps\\UniversalOpamp2 1600 -96 M180 SYMATTR InstName U3 SYMATTR SpiceModel level.1 SYMATTR Value2 Avol=1Meg GBW=100Meg Slew=100Meg SYMBOL res 1504 32 R0 WINDOW 0 -36 31 Left 2 WINDOW 3 -35 100 Left 2 SYMATTR InstName R3 SYMATTR Value 200 SYMBOL res 1840 272 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 4k SYMBOL res 1840 -112 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 4k SYMBOL res 2288 272 R0 SYMATTR InstName R2 SYMATTR Value 82k SYMBOL cap 2384 288 R0 SYMATTR InstName C4 SYMATTR Value 10p SYMBOL res 1696 128 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R8 SYMATTR Value 3.9k SYMBOL res 1696 32 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R9 SYMATTR Value 3.9k TEXT -744 480 Left 2 !.model MYSW SW(Vt=0.9 Vh=0 Ron=1 Roff=100G) TEXT 312 -176 Left 2 !.tran 0 0.5m 100u 1m\n;.ac dec 10 10 1000Meg;\n;.noise V(V_outQ) V3 dec 10 10 100meg\n;.op TEXT -744 520 Left 2 !.param RF_freq=15Meg LO_freq={RF_freq - Audio_freq} LO_period={1/LO_freq} SW_time={LO_period/4} TEXT 1048 504 Left 2 !.param C_Sample=10nf TEXT -744 632 Left 4 ;Signals for voltage-controlled switches \nused to simulate our multiplexer. TEXT 1352 632 Left 4 ;Power Connections TEXT 1352 992 Left 2 ;Unfiltered RF signal\nused for debugging. TEXT -744 -296 Left 4 ;Multiplexer TEXT 304 -288 Left 4 ;Simulation Control TEXT -728 440 Left 2 !;step dec param Audio_freq 1000 10000000 1 TEXT -728 400 Left 2 !.param Audio_freq 10000000 TEXT 304 104 Left 2 ;This circuit has more than 40dB/decade drop off, and no peaking, because\nthe two poles are uncoupled, giving an overdamped response. The two poles\nare due to the sampling capacitor and C2.