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Old 28th November 2013, 11:25 AM   #1
Elvee is offline Elvee  Belgium
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Default The Synclophone

Here is a variation on the highly successful (!) Symclophone theme.

This variant is based on analogue OR-ing instead of AND-ing for the autobias engine (or vice-versa, depending on how you see things).

It requires one more pair of transistors, but it avoids the large buffer caps, and has a tighter control on the current, meaning a better correction.

This results in a THD level lowered to less than 0.1%

It retains all the other features of the previous version: low loop gain, quasi rail to rail output, etc
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File Type: png Synclophone.png (131.5 KB, 235 views)
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File Type: asc Synclophone1.asc (9.0 KB, 9 views)
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Old 29th November 2013, 08:38 AM   #2
Elvee is offline Elvee  Belgium
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Some more details: first, the crossover characteristic. Also shown, the THD 1K, strictly identical to the THD 20K.
Next, the clipping behavior.
Then, the large signal square wave response; SR is 90 to 100V/µs for negative and positive slew.
And finally, the small signal frequency response.
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File Type: png synclo1K.png (130.9 KB, 179 views)
File Type: png syncloClip.png (102.3 KB, 167 views)
File Type: png syncloSR.png (112.5 KB, 161 views)
File Type: png syncloFR.png (132.4 KB, 157 views)
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Old 29th November 2013, 12:41 PM   #3
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Hi Elvee
I like your design (as usual)
but fft looks strange, like higher order harmonics are dominant...
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Old 29th November 2013, 12:56 PM   #4
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by padamiecki View Post
but fft looks strange, like higher order harmonics are dominant...
Probably because at 27V^ output, it is very close to clipping.

At lower levels, the overall THD is a bit higher, but with lower order dominant.
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Old 29th November 2013, 07:21 PM   #5
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by padamiecki View Post
but fft looks strange, like higher order harmonics are dominant...
In relation with that observation: one thing worth looking at is the error residue: it is often very telling about the non-linearities and the mechanisms susceptible to generate them.

In this case, there is nothing really shocking: obviously it cannot be a pure sinewave, otherwise the THD figure would be 0.00000%, but it isn't too harsh or asymmetrical either, even for a near-clipping condition (obviously, all of this exists in sim only at present and would need to be confirmed by actual tests)
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