Version 4
SHEET 1 1072 912
WIRE -1440 -1728 -1504 -1728
WIRE -1056 -1728 -1360 -1728
WIRE -752 -1728 -992 -1728
WIRE -688 -1728 -752 -1728
WIRE -608 -1728 -624 -1728
WIRE -576 -1728 -608 -1728
WIRE -480 -1728 -512 -1728
WIRE -752 -1680 -752 -1728
WIRE -608 -1680 -608 -1728
WIRE -1776 -1616 -1792 -1616
WIRE -1712 -1616 -1776 -1616
WIRE -1616 -1616 -1648 -1616
WIRE -1504 -1616 -1504 -1728
WIRE -1504 -1616 -1536 -1616
WIRE -1424 -1616 -1504 -1616
WIRE -1296 -1616 -1360 -1616
WIRE -1200 -1616 -1296 -1616
WIRE -1072 -1616 -1136 -1616
WIRE -1776 -1600 -1776 -1616
WIRE -912 -1568 -960 -1568
WIRE -752 -1568 -752 -1600
WIRE -752 -1568 -832 -1568
WIRE -480 -1568 -480 -1728
WIRE -480 -1568 -752 -1568
WIRE -464 -1568 -480 -1568
WIRE -960 -1536 -960 -1568
WIRE -752 -1536 -752 -1568
WIRE -1504 -1520 -1504 -1616
WIRE -1440 -1520 -1504 -1520
WIRE -1296 -1520 -1296 -1616
WIRE -1296 -1520 -1360 -1520
WIRE -1072 -1520 -1072 -1616
WIRE -1008 -1520 -1072 -1520
WIRE -1776 -1488 -1776 -1520
WIRE -1072 -1488 -1072 -1520
WIRE -480 -1488 -480 -1568
WIRE -752 -1456 -752 -1472
WIRE -1504 -1360 -1504 -1520
WIRE -1408 -1360 -1504 -1360
WIRE -1072 -1360 -1072 -1408
WIRE -1008 -1360 -1008 -1472
WIRE -960 -1360 -960 -1456
WIRE -752 -1360 -752 -1376
WIRE -480 -1360 -480 -1424
WIRE -1296 -1344 -1296 -1520
WIRE -1296 -1344 -1344 -1344
WIRE -1264 -1344 -1296 -1344
WIRE -1408 -1328 -1632 -1328
WIRE -1296 -1280 -1296 -1344
WIRE -896 -1248 -960 -1248
WIRE -752 -1248 -896 -1248
WIRE -896 -1216 -896 -1248
WIRE -1632 -1168 -1632 -1328
WIRE -1392 -1168 -1632 -1168
WIRE -1296 -1168 -1296 -1200
WIRE -1296 -1168 -1328 -1168
WIRE -960 -1152 -960 -1248
WIRE -896 -1104 -896 -1136
WIRE -816 -1104 -896 -1104
WIRE -688 -1104 -816 -1104
WIRE -1296 -1072 -1296 -1168
WIRE -1296 -1072 -1408 -1072
WIRE -896 -1072 -896 -1104
WIRE -1632 -1056 -1632 -1168
WIRE -1472 -1056 -1632 -1056
WIRE -816 -1056 -816 -1104
WIRE -1248 -1040 -1408 -1040
WIRE -1136 -1040 -1168 -1040
WIRE -1296 -1008 -1296 -1072
WIRE -960 -976 -960 -1072
WIRE -896 -976 -896 -992
WIRE -816 -976 -816 -992
WIRE -1440 -832 -1504 -832
WIRE -1296 -832 -1296 -928
WIRE -1296 -832 -1360 -832
WIRE -1200 -832 -1296 -832
WIRE -1072 -832 -1136 -832
WIRE -912 -832 -960 -832
WIRE -752 -832 -832 -832
WIRE -672 -832 -752 -832
WIRE -544 -832 -672 -832
WIRE -480 -832 -544 -832
WIRE -432 -832 -480 -832
WIRE -672 -800 -672 -832
WIRE -544 -784 -544 -832
WIRE -960 -752 -960 -832
WIRE -1072 -736 -1072 -832
WIRE -1008 -736 -1072 -736
WIRE -672 -720 -672 -736
WIRE -1072 -704 -1072 -736
WIRE -1504 -672 -1504 -832
WIRE -1408 -672 -1504 -672
WIRE -1296 -656 -1296 -832
WIRE -1296 -656 -1344 -656
WIRE -1264 -656 -1296 -656
WIRE -752 -656 -752 -832
WIRE -1632 -640 -1632 -1056
WIRE -1408 -640 -1632 -640
WIRE -672 -624 -672 -640
WIRE -544 -624 -544 -720
WIRE -1072 -576 -1072 -624
WIRE -1008 -576 -1008 -688
WIRE -960 -576 -960 -672
WIRE -608 -576 -608 -608
WIRE -1504 -544 -1504 -672
WIRE -1424 -544 -1504 -544
WIRE -1296 -544 -1296 -656
WIRE -1296 -544 -1360 -544
WIRE -1824 -432 -1856 -432
WIRE -1792 -432 -1824 -432
WIRE -1712 -432 -1728 -432
WIRE -1504 -432 -1504 -544
WIRE -1504 -432 -1632 -432
WIRE -1440 -432 -1504 -432
WIRE -1056 -432 -1360 -432
WIRE -752 -432 -752 -576
WIRE -752 -432 -992 -432
WIRE -720 -432 -752 -432
WIRE -608 -432 -608 -496
WIRE -608 -432 -656 -432
WIRE -576 -432 -608 -432
WIRE -480 -432 -480 -832
WIRE -480 -432 -512 -432
WIRE -1824 -368 -1824 -432
FLAG -464 -1568 speaker_a
IOPIN -464 -1568 Out
FLAG -1376 -1312 0
FLAG -960 -976 0
FLAG -960 -1360 0
FLAG -1008 -1360 0
FLAG -752 -1360 0
FLAG -752 -1248 VCC
IOPIN -752 -1248 BiDir
FLAG -1376 -1376 VCC
IOPIN -1376 -1376 BiDir
FLAG -480 -1360 0
FLAG -688 -1104 ref
IOPIN -688 -1104 BiDir
FLAG -1792 -1616 afe_in_a
IOPIN -1792 -1616 In
FLAG -1072 -1360 0
FLAG -1776 -1488 0
FLAG -896 -976 0
FLAG -816 -976 0
FLAG -1264 -1344 afe_out_a
IOPIN -1264 -1344 Out
FLAG -432 -832 speaker_b
IOPIN -432 -832 Out
FLAG -1376 -624 0
FLAG -960 -576 0
FLAG -1008 -576 0
FLAG -672 -624 0
FLAG -1376 -688 VCC
IOPIN -1376 -688 BiDir
FLAG -544 -624 0
FLAG -1072 -576 0
FLAG -1264 -656 afe_out_b
IOPIN -1264 -656 Out
FLAG -1440 -1024 0
FLAG -1440 -1088 VCC
IOPIN -1440 -1088 BiDir
FLAG -1136 -1040 ref
IOPIN -1136 -1040 BiDir
FLAG -1856 -432 afe_in_b
IOPIN -1856 -432 In
FLAG -1824 -368 0
FLAG -608 -1600 0
FLAG -608 -608 0
SYMBOL voltage -1776 -1616 R0
WINDOW 0 64 24 Right 2
WINDOW 3 251 -108 Right 2
WINDOW 123 92 69 Right 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value PULSE(-.5 .5 0 1u 1u 49u 100u)
SYMATTR Value2 AC 1
SYMBOL res -1632 -1632 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value {R_fb1}
SYMBOL cap -1424 -1632 M90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value {C_1}
SYMBOL UniversalOpamp2 -1376 -1344 R0
SYMATTR InstName U1
SYMATTR Value2 Avol=1Meg GBW={GBW} Slew=10Meg
SYMBOL voltage -960 -1168 R0
WINDOW 0 -43 59 Right 2
WINDOW 3 37 93 Right 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value 12
SYMBOL e -960 -1552 R0
WINDOW 0 12 4 Left 2
WINDOW 3 27 116 Left 2
SYMATTR InstName E1
SYMATTR Value {PlantGain}
SYMBOL ind -928 -1552 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L1
SYMATTR Value 10µ
SYMATTR SpiceLine Rser=20m
SYMBOL cap -768 -1536 R0
SYMATTR InstName C4
SYMATTR Value 680n
SYMBOL res -736 -1584 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R1
SYMATTR Value 20k
SYMBOL res -768 -1472 R0
SYMATTR InstName R2
SYMATTR Value {R_snub}
SYMBOL cap -496 -1488 R0
SYMATTR InstName C2
SYMATTR Value {C2_out}
SYMBOL res -1088 -1504 R0
SYMATTR InstName R8
SYMATTR Value 50k
SYMBOL cap -1136 -1632 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C6
SYMATTR Value 470n
SYMBOL cap -1056 -1712 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C7
SYMATTR Value 2µ2
SYMBOL res -912 -1232 R0
SYMATTR InstName R9
SYMATTR Value 10k
SYMBOL res -912 -1088 R0
SYMATTR InstName R10
SYMATTR Value 10k
SYMBOL cap -832 -1056 R0
SYMATTR InstName C8
SYMATTR Value 10µ
SYMBOL res -1456 -1504 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R11
SYMATTR Value 100k
SYMBOL cap -688 -1712 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C9
SYMATTR Value {C_lead}
SYMBOL cap -1424 -560 M90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C10
SYMATTR Value {C_1}
SYMBOL UniversalOpamp2 -1376 -656 R0
SYMATTR InstName U3
SYMATTR Value2 Avol=1Meg GBW={GBW} Slew=10Meg
SYMBOL e -960 -768 R0
WINDOW 0 12 4 Left 2
WINDOW 3 13 96 Left 2
SYMATTR InstName E2
SYMATTR Value {PlantGain}
SYMBOL ind -928 -816 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L2
SYMATTR Value 10µ
SYMATTR SpiceLine Rser=20m
SYMBOL cap -688 -800 R0
SYMATTR InstName C11
SYMATTR Value 680n
SYMBOL res -736 -560 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R14
SYMATTR Value 20k
SYMBOL res -688 -736 R0
SYMATTR InstName R15
SYMATTR Value {R_snub}
SYMBOL res -1088 -720 R0
SYMATTR InstName R16
SYMATTR Value 50k
SYMBOL cap -1136 -848 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C13
SYMATTR Value 470n
SYMBOL cap -1056 -416 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C14
SYMATTR Value 2µ2
SYMBOL res -1456 -816 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R17
SYMATTR Value 100k
SYMBOL cap -656 -448 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C15
SYMATTR Value {C_lead}
SYMBOL res -1344 -448 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R18
SYMATTR Value 1k0
SYMBOL UniversalOpamp2 -1440 -1056 M0
SYMATTR InstName U4
SYMATTR Value2 Avol=1Meg GBW={GBW} Slew=100Meg
SYMBOL res -1312 -1296 R0
SYMATTR InstName R19
SYMATTR Value 10k
SYMBOL res -1312 -1024 R0
SYMATTR InstName R20
SYMATTR Value 10k
SYMBOL cap -1648 -1632 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value 3µ0
SYMBOL res -1152 -1056 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 10k
SYMBOL res -1728 -448 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R13
SYMATTR Value {R_fb1}
SYMBOL cap -1392 -1152 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C5
SYMATTR Value {C_3}
SYMBOL res -1344 -1744 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 1k0
SYMBOL cap -560 -784 R0
SYMATTR InstName C12
SYMATTR Value {C2_out}
SYMBOL cap -1728 -448 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C17
SYMATTR Value 3µ0
SYMBOL cap -576 -1712 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C16
SYMATTR Value {10*C_lead}
SYMBOL res -624 -1696 R0
SYMATTR InstName R4
SYMATTR Value {R_lead}
SYMBOL cap -576 -416 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C18
SYMATTR Value {10*C_lead}
SYMBOL res -624 -592 R0
SYMATTR InstName R7
SYMATTR Value {R_lead}
TEXT -560 -1048 Left 2 !;ac dec 100 20 20k
TEXT -560 -1128 Left 2 !.param PlantGain 10
TEXT -1808 -264 Left 3 ;class-D BTL amp with fully symmetrical AFE and postfilter feedback
TEXT -560 -1152 Left 2 !.param GBW 30Meg
TEXT -560 -1024 Left 2 !.tran 0 1 999.8m startup
TEXT -560 -1104 Left 2 !.param C_1 5n
TEXT -560 -1080 Left 2 !.param R_snub 5r0
TEXT -560 -1176 Left 2 !.param C_lead 1n
TEXT -1280 -344 Left 2 ;OPA=OPA2134
TEXT -560 -1200 Left 2 !.param R_fb1 4k7
TEXT -560 -1224 Left 2 !.param R_fb3 10k
TEXT -560 -992 Left 2 !.param C_3 1p
TEXT -552 -952 Left 2 !.param C2_out 680n
TEXT -560 -1264 Left 2 !.param R_lead 150
TEXT -552 -912 Left 2 ;R_snub = NTC