Re: 1kHz 130dB distortion sinewave oscillator.

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vnim5i$3hnrj$1@dont-email.me...

On 31/01/2025 5:47 am, Edward Rawde wrote:

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.

But at least I know what mine are doing.
>

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.

>
This is a strange circuit. One problem with using an N-channel junction fet like J113 is that if you bias the gate at a higher
voltage than the source or drain, it acts as a diode and feeds current into the channel.
>
I've downloaded and run the second version of the simulation, and the gate doesn't seem to end up more negative than the source or
drain.
>
It takes quite a lot of simulation time before the circuit starts acting as if were an amplitude controlled oscillator, and I'm
not interested enough to try and work how it is actually working.

After tweaking a few component values, I get -130dB with the circuit below on LTSPice 24.1.1

Simulate to 20s and take a sample near 20s. FFT on current zoom extent with Blackman-Harris window.

Zoom in on 1kHZ and 2kHz. Place cursors to get difference. -130.7 dB give or take a dB. All other harmonics are lower.

Also if you make a trace for V(gate)-V(src) you find it's -675mV at 20s so as far as I can tell the FET is operating conventionally
and in the centre of its control range.
If it goes positive at all it's only during the first 10ms but amost anything can happen with this circuit during the first 10ms.

Getting below -130dB will likely require another four rectifier phases so that the signal at the node named levelfb reduces by half
again.

If you can come up with a suitable eight phase rectifier let me know, particularly if it doesn't require DC stabilization of every
phase to get the contribution through all eight diodes equal.

After all, I spent a lot of time figuring out that the reason why your circuit doesn't simulate in 24.1.1 is something to do with
LT1115 but I still don't know exactly what.

This circuit uses LT1115 but only for the oscillator. The rectifier and level controller can use TL084 or similar.

Version 4.1
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SYMATTR Value 560k
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 ;130dB. Edward Rawde 31 Jan 2025.