1kHz 130dB distortion sinewave oscillator.

Approaching 130dB now. Any suggestions for improvement?
It wouldn't be hard to add another four rectifier phases but then I'd have more components than Bill.

This circuit was simulated in LTSpice 24.1.1 with all component updates as of 30th January 2025.

Take a sample near 20s and FFT on current zoom extent with Blackman-Harris window.
It's approaching 130dB at 2kHz and approaching 140dB everywhere else.

I do not know why C13/R28 and similar are needed but without them the simulation speed goes down to us/s
It appears that LT1115 doesn't like being simulated with very little load on its output.
Whether or not that's true in reality I've no idea and it may not be the case in earlier versions of LTSpice.

Simulation speed in 24.1.1 appears to be about twice as fast as earlier versions for this circuit.

Version 4.1
SHEET 1 3828 932
WIRE 976 -816 816 -816
WIRE 1056 -816 1056 -848
WIRE 880 -752 880 -768
WIRE 976 -736 976 -816
WIRE 976 -736 912 -736
WIRE 816 -720 816 -816
WIRE 816 -720 720 -720
WIRE 848 -720 816 -720
WIRE 1056 -704 1056 -736
WIRE 1056 -704 912 -704
WIRE 336 -672 256 -672
WIRE 480 -672 400 -672
WIRE 720 -672 720 -720
WIRE 1056 -672 1056 -704
WIRE 1168 -672 1056 -672
WIRE 880 -656 880 -688
WIRE 1056 -656 1056 -672
WIRE 1168 -640 1168 -672
WIRE 256 -576 256 -672
WIRE 336 -576 256 -576
WIRE 480 -576 480 -672
WIRE 480 -576 416 -576
WIRE 1056 -544 1056 -576
WIRE 1168 -544 1168 -576
WIRE 2384 -512 1312 -512
WIRE -192 -480 -192 -512
WIRE 1376 -480 848 -480
WIRE 384 -464 384 -480
WIRE 480 -448 480 -576
WIRE 480 -448 416 -448
WIRE 576 -448 480 -448
WIRE 720 -448 720 -592
WIRE 720 -448 576 -448
WIRE 1232 -448 720 -448
WIRE 1904 -448 1232 -448
WIRE 2896 -448 1904 -448
WIRE 256 -432 256 -576
WIRE 352 -432 256 -432
WIRE 448 -416 416 -416
WIRE 464 -416 448 -416
WIRE 576 -400 576 -448
WIRE 1232 -400 1232 -448
WIRE 1904 -384 1904 -448
WIRE 2896 -384 2896 -448
WIRE 384 -368 384 -400
WIRE 1616 -368 1568 -368
WIRE 1760 -368 1696 -368
WIRE 2608 -368 2560 -368
WIRE 2752 -368 2688 -368
WIRE 16 -352 -144 -352
WIRE 576 -288 576 -320
WIRE 1232 -288 1232 -320
WIRE -80 -272 -80 -304
WIRE 1568 -272 1568 -368
WIRE 1616 -272 1568 -272
WIRE 1760 -272 1760 -368
WIRE 1760 -272 1680 -272
WIRE 1904 -272 1904 -304
WIRE 2560 -272 2560 -368
WIRE 2608 -272 2560 -272
WIRE 2752 -272 2752 -368
WIRE 2752 -272 2672 -272
WIRE 2896 -272 2896 -304
WIRE -144 -256 -144 -352
WIRE -112 -256 -144 -256
WIRE 16 -240 16 -352
WIRE 16 -240 -48 -240
WIRE 48 -240 16 -240
WIRE 64 -240 48 -240
WIRE 256 -240 256 -432
WIRE -192 -224 -192 -400
WIRE -112 -224 -192 -224
WIRE -416 -208 -416 -304
WIRE 1040 -192 944 -192
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WIRE -192 -176 -256 -176
WIRE -80 -176 -80 -208
WIRE 576 -160 576 -224
WIRE 848 -160 848 -480
WIRE 848 -160 576 -160
WIRE 1232 -160 1232 -192
WIRE 1312 -160 1312 -512
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WIRE 2640 -160 2640 -176
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WIRE 1904 -128 1904 -208
WIRE 1904 -128 1792 -128
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WIRE 2784 -112 2784 -128
WIRE 448 -96 384 -96
WIRE 576 -96 576 -160
WIRE 576 -96 512 -96
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WIRE 1040 -96 944 -96
WIRE 1232 -96 1232 -160
WIRE 1232 -96 1120 -96
WIRE 208 -80 160 -80
WIRE 256 -80 256 -160
WIRE 256 -80 208 -80
WIRE 1648 -64 1648 -96
WIRE 2640 -64 2640 -96
WIRE -416 -32 -416 -128
WIRE -256 -32 -256 -64
WIRE -192 -32 -192 -64
WIRE 160 -32 160 -80
WIRE 1792 -32 1792 -48
WIRE 2784 -32 2784 -48
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WIRE 448 0 384 0
WIRE 576 0 576 -96
WIRE 576 0 528 0
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WIRE 992 0 944 0
WIRE 1104 0 1072 0
WIRE 1232 0 1232 -96
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WIRE 336 112 304 112
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WIRE 1648 736 1648 704
WIRE 1856 736 1856 704
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WIRE 1920 832 1856 832
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WIRE 2688 832 2640 832
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WIRE 2848 832 2688 832
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WIRE 2912 832 2848 832
WIRE 832 864 832 832
WIRE 1920 864 1920 832
WIRE 2912 864 2912 832
FLAG 384 -480 V+
FLAG 464 80 V+
FLAG 1024 96 V+
FLAG 208 -80 gate
FLAG 128 112 drn
FLAG 3808 448 0
FLAG 3744 288 output
FLAG -416 -32 0
FLAG 384 -368 0
FLAG 464 192 0
FLAG 1024 208 0
FLAG -416 -304 V+
FLAG 448 -416 half
FLAG 400 144 half
FLAG 1376 656 half
FLAG -80 -176 0
FLAG -80 -304 V+
FLAG 48 -240 half
FLAG -192 -32 0
FLAG -192 -512 V+
FLAG -256 -32 0
FLAG 304 112 src
FLAG 880 -768 V+
FLAG 880 -656 0
FLAG 1056 -544 0
FLAG 1056 -848 V+
FLAG 1168 -544 0
FLAG 1248 784 0
FLAG 832 864 0
FLAG 1008 592 V+
FLAG 1008 720 0
FLAG 1648 -176 V+
FLAG 1648 -64 0
FLAG 1792 64 0
FLAG 2480 656 half
FLAG 2336 784 0
FLAG 1920 864 0
FLAG 2096 592 V+
FLAG 2096 720 0
FLAG 2640 -176 V+
FLAG 2640 -64 0
FLAG 2784 64 0
FLAG 3472 656 half
FLAG 3328 784 0
FLAG 2912 864 0
FLAG 3088 592 V+
FLAG 3088 720 0
SYMBOL njf 192 64 M90
WINDOW 0 -37 23 VRight 2
WINDOW 3 -9 -3 VRight 2
SYMATTR InstName J1
SYMATTR Value J113
SYMBOL voltage -416 -224 R0
WINDOW 123 0 0 Left 0
WINDOW 39 10 135 Left 2
WINDOW 0 10 0 Left 2
WINDOW 3 15 104 Left 2
SYMATTR InstName V2
SYMATTR Value 36
SYMBOL schottky 1248 -224 R180
WINDOW 3 24 0 Left 2
WINDOW 0 24 64 Left 2
SYMATTR Value BAS40HY
SYMATTR InstName D2
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 176 176 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 22
SYMBOL res 176 -48 M0
WINDOW 0 38 42 Left 2
WINDOW 3 36 66 Left 2
SYMATTR InstName R2
SYMATTR Value 100k
SYMBOL res 272 -144 R180
WINDOW 0 40 70 Left 2
WINDOW 3 45 42 Left 2
SYMATTR InstName R1
SYMATTR Value 100k
SYMBOL res 320 -560 R270
WINDOW 0 33 55 VTop 2
WINDOW 3 -3 55 VBottom 2
SYMATTR InstName R4
SYMATTR Value 100k
SYMBOL res 1248 -304 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R6
SYMATTR Value 100k
SYMBOL cap 400 -688 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value 10000n
SYMATTR SpiceLine V=6.3 Irms=0 Rser=0 Lser=0 mfg="Murata" pn="GRM185R60J106ME15" type="X5R"
SYMBOL res 1136 -112 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R9
SYMATTR Value 15k
SYMBOL res 832 112 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R12
SYMATTR Value 8.2K
SYMBOL cap 1104 -208 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 10n
SYMATTR SpiceLine V=16 Irms=647m Rser=0.0322889 Lser=0 mfg="KEMET" pn="C0201C103K4PAC" type="X5R"
SYMBOL cap 720 112 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C4
SYMATTR Value 22n
SYMATTR SpiceLine V=4 Irms=356m Rser=0.150334 Lser=0 mfg="KEMET" pn="C0402C223K7PAC" type="X5R"
SYMBOL res 544 -16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R13
SYMATTR Value 10k
SYMBOL cap 512 -112 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C5
SYMATTR Value 22p
SYMATTR SpiceLine V=16 Irms=0 Rser=0.3482 Lser=551p mfg="W�rth Elektronik" pn="885012006019 WCAP-CSGP 0603" type="NP0"
SYMBOL res 448 272 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R14
SYMATTR Value 1371
SYMBOL res 704 -688 R0
SYMATTR InstName R17
SYMATTR Value 100k
SYMBOL res 3552 272 R90
WINDOW 0 -4 57 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 600
SYMBOL res 3824 448 R180
WINDOW 0 47 75 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R8
SYMATTR Value 600
SYMBOL res -208 -384 M180
WINDOW 0 40 70 Left 2
WINDOW 3 37 41 Left 2
SYMATTR InstName R5
SYMATTR Value 100k
SYMBOL res -208 -48 M180
WINDOW 0 40 70 Left 2
WINDOW 3 38 43 Left 2
SYMATTR InstName R10
SYMATTR Value 100k
SYMBOL cap -240 -64 R180
WINDOW 0 24 56 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C1
SYMATTR Value 10n
SYMATTR SpiceLine V=50 Irms=291m Rser=0.34258 Lser=0 mfg="KEMET" pn="C0805F103K5RAC" type="X7R"
SYMBOL cap 3648 272 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C6
SYMATTR Value 10000n
SYMATTR SpiceLine V=25 Irms=0 Rser=0 Lser=0 mfg="Murata" pn="GRM188R61E106MA73" type="X5R"
SYMBOL res 1088 -16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R11
SYMATTR Value 150k
SYMBOL res 288 272 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R15
SYMATTR Value 8.2k
SYMBOL res 1200 -16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R16
SYMATTR Value 47k
SYMBOL OpAmps\LT1058 -80 -304 R0
SYMATTR InstName U5
SYMBOL OpAmps\LT1058 384 -496 M0
SYMATTR InstName U6
SYMBOL OpAmps\LT1058 880 -784 M0
WINDOW 0 -79 26 Left 2
WINDOW 3 -120 114 Left 2
SYMATTR InstName U1
SYMBOL res 1040 -832 R0
SYMATTR InstName R19
SYMATTR Value 120k
SYMBOL res 1040 -672 R0
SYMATTR InstName R20
SYMATTR Value 100k
SYMBOL cap 1152 -576 M180
WINDOW 0 24 56 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C7
SYMATTR Value 10n
SYMATTR SpiceLine V=50 Irms=291m Rser=0.34258 Lser=0 mfg="KEMET" pn="C0805F103K5RAC" type="X7R"
SYMBOL OpAmps\LT1115 464 64 R0
SYMATTR InstName U4
SYMBOL OpAmps\LT1115 1024 80 R0
SYMATTR InstName U3
SYMBOL schottky 592 -224 R180
WINDOW 3 24 0 Left 2
WINDOW 0 24 64 Left 2
SYMATTR Value BAS40HY
SYMATTR InstName D1
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 592 -304 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R18
SYMATTR Value 100k
SYMBOL schottky 624 528 M0
SYMATTR Value BAS40HY
SYMATTR InstName D5
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 592 704 R0
SYMATTR InstName R21
SYMATTR Value 820k
SYMBOL schottky 832 528 M0
SYMATTR Value BAS40HY
SYMATTR InstName D6
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 816 704 R0
SYMATTR InstName R22
SYMATTR Value 820k
SYMBOL res 1248 640 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R23
SYMATTR Value 100k
SYMBOL OpAmps\LT1058 1008 592 R0
SYMATTR InstName U2
SYMBOL res 1104 640 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R24
SYMATTR Value 820k
SYMBOL cap 576 736 M0
SYMATTR InstName C9
SYMATTR Value 1u
SYMBOL cap 784 736 M0
SYMATTR InstName C10
SYMATTR Value 1u
SYMBOL cap 976 560 M270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C11
SYMATTR Value 1u
SYMBOL cap 1264 768 R180
WINDOW 0 24 56 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C8
SYMATTR Value 1u
SYMBOL res 624 496 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R25
SYMATTR Value 10k
SYMBOL res 832 496 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R26
SYMATTR Value 10k
SYMBOL OpAmps\LT1115 1648 -192 R0
SYMATTR InstName U7
SYMBOL res 1408 -160 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R27
SYMATTR Value 1.5k
SYMBOL cap 1680 -288 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C12
SYMATTR Value 100n
SYMBOL cap 1776 -112 R0
SYMATTR InstName C13
SYMATTR Value 1000n
SYMBOL res 1776 -48 R0
SYMATTR InstName R28
SYMATTR Value 820
SYMBOL schottky 1920 -208 R180
WINDOW 3 24 0 Left 2
WINDOW 0 24 64 Left 2
SYMATTR Value BAS40HY
SYMATTR InstName D3
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 1920 -288 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R36
SYMATTR Value 100k
SYMBOL res 1712 -384 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R29
SYMATTR Value 100k
SYMBOL schottky 1712 528 M0
SYMATTR Value BAS40HY
SYMATTR InstName D7
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 1680 704 R0
SYMATTR InstName R30
SYMATTR Value 820k
SYMBOL schottky 1920 528 M0
SYMATTR Value BAS40HY
SYMATTR InstName D8
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 1904 704 R0
SYMATTR InstName R31
SYMATTR Value 820k
SYMBOL res 2336 640 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R32
SYMATTR Value 100k
SYMBOL OpAmps\LT1058 2096 592 R0
SYMATTR InstName U8
SYMBOL res 2192 640 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R33
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SYMBOL cap 1664 736 M0
SYMATTR InstName C14
SYMATTR Value 1u
SYMBOL cap 1872 736 M0
SYMATTR InstName C15
SYMATTR Value 1u
SYMBOL cap 2064 560 M270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C16
SYMATTR Value 10u
SYMBOL cap 2352 768 R180
WINDOW 0 24 56 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C17
SYMATTR Value 1u
SYMBOL res 1712 496 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R34
SYMATTR Value 10k
SYMBOL res 1920 496 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R35
SYMATTR Value 10k
SYMBOL OpAmps\LT1115 2640 -192 R0
SYMATTR InstName U9
SYMBOL cap 2672 -288 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C18
SYMATTR Value 100n
SYMBOL cap 2768 -112 R0
SYMATTR InstName C19
SYMATTR Value 1000n
SYMBOL res 2768 -48 R0
SYMATTR InstName R37
SYMATTR Value 820
SYMBOL schottky 2912 -208 R180
WINDOW 3 24 0 Left 2
WINDOW 0 24 64 Left 2
SYMATTR Value BAS40HY
SYMATTR InstName D4
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 2912 -288 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R38
SYMATTR Value 100k
SYMBOL res 2704 -384 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R39
SYMATTR Value 100k
SYMBOL schottky 2704 528 M0
SYMATTR Value BAS40HY
SYMATTR InstName D9
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 2672 704 R0
SYMATTR InstName R40
SYMATTR Value 820k
SYMBOL schottky 2912 528 M0
SYMATTR Value BAS40HY
SYMATTR InstName D10
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 2896 704 R0
SYMATTR InstName R41
SYMATTR Value 820k
SYMBOL res 3328 640 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R42
SYMATTR Value 100k
SYMBOL OpAmps\LT1058 3088 592 R0
SYMATTR InstName U10
SYMBOL res 3184 640 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R43
SYMATTR Value 820k
SYMBOL cap 2656 736 M0
SYMATTR InstName C20
SYMATTR Value 1u
SYMBOL cap 2864 736 M0
SYMATTR InstName C21
SYMATTR Value 1u
SYMBOL cap 3056 560 M270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C22
SYMATTR Value 10u
SYMBOL cap 3344 768 R180
WINDOW 0 24 56 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C23
SYMATTR Value 1u
SYMBOL res 2704 496 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R44
SYMATTR Value 10k
SYMBOL res 2912 496 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R45
SYMATTR Value 10k
SYMBOL res 2400 -160 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R46
SYMATTR Value 1.5k
TEXT -496 136 Left 2 !.tran 0 20 0 1u uic
TEXT -496 88 Left 2 !.options plotwinsize=0 numdgt=7 method=trap
TEXT -424 -648 Left 2 ;1kHz low distortion sinewave oscillator.
TEXT -424 -616 Left 2 ;Approaching 130dB. Edward Rawde 30 Jan 2025.