Re: Sinewave oscillator without gain control.

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vnck1i$295d5$1@dont-email.me...

On 24/01/2025 5:02 pm, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vmv6ac$22ufe$1@dont-email.me...

On 24/01/2025 11:14 am, Edward Rawde wrote:

Before you can make a 1kHz sinewave oscillator with constant output level and better than 120dB harmonic distortion you'll need
an
oscillator which does better than that when it passes through the required output level.

>
This is obviously true. Why do you think you need to tell us about it?
>

>
You do make me laugh sometimes Bill.
Your circuit doesn't come anywhere close to 120dB but it does depend on which simulator you ask.

>
I never said it did. I was looking for comments on the way the current mirrors might screw up the waveform. I didn't get any.
>

Adding a FET gain stabilizer to the circuit I posted seems to have negligible effect on the distortion.

>
Then you haven't looked at the current waveform going through the the FET.
>

So I'd concentrate on the oscillator distortion level rather than the gain controller contribution if I wanted to attempt better
than 120dB.

>
And you'd probably better dump LTSpice 24.1 - it has been claimed that it has a serious bug. That might explain why your
simulations of my circuit run a thousand times slower for you than they do for me and a couple of other people.

If U3 and U8 (LT1115) in your circuit are replaced with LT1678 then on my computer with LTSpice 24.1.1 and all component updates,
the simulation completes almost as fast as I can start it, at about 55 ms/s.
A sample near 10s is not quite 60dB down at 3kHz and 5kHz and 70dB down at 7kHz, approaching 80dB down everywhere else.
The parasitic 23MHz signal has gone.

So the reason for the slow simulation speed in 24.1.1 is something to do with LT1115.

The circuit I simulated in 24.1.1 with LT1678 is below.

Version 4.1
SHEET 1 3608 920
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WINDOW 3 32 32 VTop 2
SYMATTR InstName C13
SYMATTR Value 10p
SYMBOL res 2592 -1792 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R12
SYMATTR Value 137k
SYMBOL res 1376 -1776 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R8
SYMATTR Value 14k
SYMBOL res 1216 -1456 R0
SYMATTR InstName R13
SYMATTR Value 56k
SYMBOL cap 1312 -1392 R0
SYMATTR InstName C3
SYMATTR Value 18n
SYMBOL cap 1056 -1856 R0
SYMATTR InstName C12
SYMATTR Value 18n
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 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 Q6
SYMATTR Value 2N5089
SYMBOL OpAmps\LT1678 -656 -1408 R0
SYMATTR InstName U3
SYMBOL OpAmps\LT1678 -176 -1520 R0
SYMATTR InstName U8
TEXT -1736 -600 Left 2 !.MODEL BAS70L D IS = 3.22E-9 N = 1.018 BV = 77 IBV = 1.67E-7 RS = 20.89 CJO = 1.608E-12 VJ = 0.3891 M =
0.3683 FC = 0.5 EG = 0.69 XTI = 2
TEXT -336 -528 Left 2 ;R2 a,b,c, Vishay Beschlag  ACAS06S0830372P1AT precision 10k resistor \n at R1a, R1b Maxim MAX5492LB10000+T
10K resistive divider in a  SOT-23-5 package
TEXT -1136 -536 Left 2 !.tran 0 10s 0s startup