Re: Current mirror version of the lowish distortion 1kHz sine wave osillator

On 15/01/2025 11:33 pm, Bill Sloman wrote:

This just reworks my circuit to use a controllable asymmetric current mirror instead of the FET for gain control. I take the feedback from the full wave rectifier and switch every half-cycle to reconstruct a variable amplitude sine wave to control the output amplitude. It does use a lot of components, but it strikes me as fairly comprehensible.
 R30 isn't a real part - it's just there to let me do an FFT on the correction signal.
 The circuit just copes with worst case capacitors - 15.15nF and 14.85nF - at C5 and C6, as it was intended to do. Using a trim pot to take out component tolerances would let you get away with a smaller correction signal injecting smaller doses of the odd harmonics.
 The circuit does cry out for monolithic dual transisors.The On-Semi
NST45010MW6T1G pnp and the
NST45011MW6T1G npn parts are cheap and widely available.

There was a dumb error in the original circuit. The two transistor switch (Q5 and Q6 in the original circuit) that turned the full wave rectified waveform back into a sine wave was set up with very little headroom. It didn't stop the circuit from working as intended after it had settled down, but it made start-up a bit tricky.
Here's the corrected version. It's performance isn't noticeably differ
Version 4
SHEET 1 3608 920
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SYMBOL res 1216 -1568 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R14
SYMATTR Value 14k
SYMBOL Opamps\LT1013 1392 -1632 R0
SYMATTR InstName U6
SYMBOL res 896 -1536 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R15
SYMATTR Value 18.7k
SYMBOL res 2048 -1840 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R16
SYMATTR Value 14k
SYMBOL cap 1728 -1872 R0
SYMATTR InstName C14
SYMATTR Value 18n
SYMBOL res 1888 -1584 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R17
SYMATTR Value 14k
SYMBOL Opamps\LT1013 2064 -1648 R0
SYMATTR InstName U7
SYMBOL res 1568 -1552 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R18
SYMATTR Value 18.7k
SYMBOL res 1888 -1408 R0
SYMATTR InstName R19
SYMATTR Value 56k
SYMBOL cap 1984 -1344 R0
SYMATTR InstName C24
SYMATTR Value 18n
SYMBOL npn -1504 -1008 R0
SYMATTR InstName Q1
SYMATTR Value 2N5089
SYMBOL npn -1712 -1008 M0
SYMATTR InstName Q2
SYMATTR Value 2N5089
SYMBOL res 2384 -1792 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R9
SYMATTR Value 17k
SYMBOL res 2416 -1728 R0
SYMATTR InstName R28
SYMATTR Value 68k
SYMBOL Opamps\LT1115 -656 -1472 R0
SYMATTR InstName U3
SYMBOL Opamps\LT1115 -176 -1584 R0
SYMATTR InstName U8
SYMBOL cap 320 -1376 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 3.3p
SYMBOL res -1792 -848 R0
SYMATTR InstName R7
SYMATTR Value 68
SYMBOL pnp -1840 -1632 M180
WINDOW 3 84 0 Left 2
SYMATTR Value 2N5087
SYMATTR InstName Q3
SYMBOL res -1792 -1984 R0
SYMATTR InstName R11
SYMATTR Value 270k
SYMBOL res -1632 -1920 R0
SYMATTR InstName R21
SYMATTR Value 47k
SYMBOL pnp -1296 -1824 R180
WINDOW 3 84 0 Left 2
SYMATTR Value 2N5087
SYMATTR InstName Q7
SYMBOL pnp -1264 -1824 M180
WINDOW 0 57 29 Left 2
WINDOW 3 60 62 Left 2
SYMATTR InstName Q8
SYMATTR Value 2N5087
SYMBOL res -448 -1328 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R23
SYMATTR Value 10k
SYMATTR SpiceLine tol=1
SYMBOL res -1376 -2176 R0
SYMATTR InstName R6
SYMATTR Value 1.5k
SYMBOL res -1216 -2128 R0
SYMATTR InstName R24
SYMATTR Value 1.5k
SYMBOL pnp -1264 -1680 M180
WINDOW 0 57 29 Left 2
WINDOW 3 60 62 Left 2
SYMATTR InstName Q9
SYMATTR Value 2N5087
SYMBOL npn -1504 -1200 R0
SYMATTR InstName Q10
SYMATTR Value 2N5089
SYMBOL res -1376 -2064 R0
SYMATTR InstName R27
SYMATTR Value 6.2
SYMBOL Opamps\LT1013 -1984 -1744 R0
SYMATTR InstName U9
SYMBOL res -560 -1744 R0
SYMATTR InstName R20
SYMATTR Value 120
SYMBOL Opamps\LT1056A 3264 -1088 R0
SYMATTR InstName U10
SYMBOL res 3136 -1328 R0
SYMATTR InstName R25
SYMATTR Value 10k
SYMBOL res 3136 -944 R0
SYMATTR InstName R29
SYMATTR Value 10k
SYMBOL res -976 -1632 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R30
SYMATTR Value 1
SYMATTR SpiceLine tol=1
SYMBOL res -1008 -1296 R0
SYMATTR InstName R31
SYMATTR Value 20k
SYMBOL res -1696 -2112 R0
SYMATTR InstName R32
SYMATTR Value 36k
SYMATTR SpiceLine tol=1
SYMBOL res -1696 -1344 R0
SYMATTR InstName R33
SYMATTR Value 18k
SYMBOL npn -1584 -1424 R0
SYMATTR InstName Q5
SYMATTR Value 2N5089
SYMBOL npn -1296 -1424 M0
SYMATTR InstName Q5
SYMATTR Value 2N5089
TEXT -2232 -1200 Left 2 !.MODEL BAS70L D \n+ IS = 3.22E-9 \n+ N = 1.018 \n+ BV = 77 \n+ IBV = 1.67E-7 \n+ RS = 20.89 \n+ CJO = 1.608E-12 \n+ VJ = 0.3891 \n+ M = 0.3683 \n+ FC = 0.5 \n+ EG = 0.69 \n+ XTI = 2 \n.ENDS
TEXT -336 -528 Left 2 ;R2 a,b,c, Vishay Beschlag  ACAS06S0830372P1AT precision 10k resistor array \n R1a, R1b Maxim  MAX5492LB10000+T  10K resistive divider in a  SOT-23-5 package
TEXT -720 -464 Left 2 !.MODEL MMBF4391 NJF VTO=-4.6 BETA=0.02779 LAMBDA=0.00595 RD=1 RS=1 IS=1e-14 CGD=14p CGS=10.5p PB=1 B=1 KF=1e-18 AF=1 FC=0.5 mfg=Motorola
TEXT -1112 -464 Left 2 !.tran 0 10s 0s startup
--
Bill Sloman, Sydney