* Z:\home\khalils\Downloads\files\data\raw_asc\LT1256.asc
* Generated by LTspice 26.0.1 for Windows.
* AM Modulator with DC Output Nulling Circuit
* Library below included based on ModelFile attribute of instance XU2 (C:\users\khalils\AppData\Local\LTspice\lib\sym\OpAmps\LT1077.asy), XU1 (C:\users\khalils\AppData\Local\LTspice\lib\sym\OpAmps\LT1256.asy)
R2 N005 N001 220K
V1 +V 0 5
XU1 N003 N002 N005 N006 0 N008 -V OUT +V 0 N007 N001 N004 0 LT1256 ;pnba IN1)FB1)Vc)Ic)Rc)NULL)V-)Vout)V+)Rfs)Ifs)Vfs)FB2)IN2
R5 0 N005 220K
C3 N009 N008 .1
V5 MODULATION 0 SINE(0 1 10K)
C2 N005 MODULATION .1
XU2 0 N009 +V -V N008 LT1078 ;pnba In+)In-)V+)V-)OUT
R4 N002 OUT 1.5K
V2 -V 0 -5
R1 0 N003 50
C1 N003 CARRIER .1
V3 CARRIER 0 SINE(0 1 1Meg)
R6 OUT N009 220K
V4 N001 0 2.5
R3 N004 OUT 1.5K
.tran 500u
.lib LTC.lib
.backanno
.end

* LTspice schematic (.asc):
Version 4
SHEET 1 1268 824
WIRE 752 -64 160 -64
WIRE 976 -64 752 -64
WIRE 160 -48 160 -64
WIRE 976 -48 976 -64
WIRE 864 0 368 0
WIRE 864 32 864 0
WIRE 976 48 976 32
WIRE 208 80 -416 80
WIRE 304 80 272 80
WIRE 400 80 304 80
WIRE 720 80 688 80
WIRE -416 96 -416 80
WIRE 304 96 304 80
WIRE 368 144 368 0
WIRE 400 144 368 144
WIRE 784 144 688 144
WIRE -416 192 -416 176
WIRE 32 208 -80 208
WIRE 160 208 160 32
WIRE 160 208 96 208
WIRE 400 208 160 208
WIRE 752 208 752 -64
WIRE 752 208 688 208
WIRE -80 224 -80 208
WIRE 160 224 160 208
WIRE 400 272 368 272
WIRE 720 272 688 272
WIRE 784 272 784 144
WIRE -80 320 -80 304
WIRE 160 320 160 304
WIRE 400 336 368 336
WIRE 704 336 688 336
WIRE 400 400 304 400
WIRE 704 400 688 400
WIRE -112 464 -112 448
WIRE 16 464 16 448
WIRE 400 464 384 464
WIRE 784 464 784 352
WIRE 784 464 688 464
WIRE 864 464 864 112
WIRE 864 464 784 464
WIRE 912 464 864 464
WIRE -112 560 -112 544
WIRE 16 560 16 544
WIRE 384 560 352 560
WIRE 544 560 448 560
WIRE 480 624 480 608
WIRE 544 640 544 560
WIRE 544 640 512 640
WIRE 608 640 544 640
WIRE 784 640 784 464
WIRE 784 640 688 640
WIRE 304 656 304 400
WIRE 352 656 352 560
WIRE 352 656 304 656
WIRE 448 656 352 656
WIRE 544 672 512 672
WIRE 480 704 480 688
SYMBOL cap 96 192 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value .1
SYMBOL res 848 16 R0
SYMATTR InstName R4
SYMATTR Value 1.5K
SYMBOL voltage 976 -64 R0
SYMATTR InstName V4
SYMATTR Value 2.5
SYMBOL res 288 192 M180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R1
SYMATTR Value 50
SYMBOL voltage 16 448 R0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL cap 272 64 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value .1
SYMBOL res 704 624 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 220K
SYMBOL opamps\\LT1077 480 592 M0
SYMATTR InstName U2
SYMBOL res 768 256 R0
SYMATTR InstName R3
SYMATTR Value 1.5K
SYMBOL res 144 48 M180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R2
SYMATTR Value 220K
SYMBOL opamps\\LT1256 544 176 R0
SYMATTR InstName U1
SYMBOL cap 448 544 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value .1
SYMBOL voltage -416 80 R0
WINDOW 0 24 24 Left 2
WINDOW 3 22 100 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value SINE(0 1 1Meg)
SYMBOL res 144 320 M180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R5
SYMATTR Value 220K
SYMBOL voltage -112 448 R0
SYMATTR InstName V2
SYMATTR Value -5
SYMBOL voltage -80 208 R0
WINDOW 3 24 98 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value SINE(0 1 10K)
SYMATTR InstName V5
FLAG 16 560 0
FLAG 704 400 +V
FLAG 16 448 +V
FLAG 384 464 -V
FLAG -112 560 0
FLAG -112 448 -V
FLAG 704 336 0
FLAG 368 336 0
FLAG 976 48 0
FLAG -416 192 0
FLAG 720 80 0
FLAG 912 464 OUT
FLAG 304 176 0
FLAG 160 320 0
FLAG -80 320 0
FLAG 544 672 0
FLAG 480 704 -V
FLAG 480 608 +V
FLAG -416 80 CARRIER
FLAG -80 208 MODULATION
TEXT 752 704 Left 2 !.tran 500u
TEXT 312 -80 Bottom 2 ;AM Modulator with DC Output Nulling Circuit