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Old 24th December 2012, 04:09 PM   #251
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Kevin

Been busy preparing for the holidays (always hard to take time off work) but I still dont get the association with phase margin.

Seems to me that given a constant cross-over loop frequency, the only way to get less phase margin is to either increase the loop gain or move the dominant pole to a slightly higher frequency. Both of these should result in an overall increase in loop gain (gain bandwidth within 20Khz) and thus should lower distortion.

Happy holidays
-Antonio
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Old 1st February 2014, 10:19 PM   #252
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Scheme can be greatly simplified if we use the type transistors Lateral. Duple difkaskad FET input impedance stabilizes.
Using a third-wire and resistor R20 provides a small negative output resistance, which reduces the noise on the wires because Back EMF.

http://s55.radikal.ru/i149/1402/9f/e2d0182a132e.png


best regards
Petr
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Old 2nd February 2014, 01:02 AM   #253
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Get about the same effect as using the output transistors of one structure
http://s019.radikal.ru/i642/1402/0a/473666f87b01.png


best regards
Petr
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Old 2nd February 2014, 04:15 AM   #254
MiiB is online now MiiB  Denmark
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Quote:
Originally Posted by Petr1951 View Post
Scheme can be greatly simplified if we use the type transistors Lateral. Duple difkaskad FET input impedance stabilizes.
Using a third-wire and resistor R20 provides a small negative output resistance, which reduces the noise on the wires because Back EMF.

http://s55.radikal.ru/i149/1402/9f/e2d0182a132e.png


best regards
Petr
Hi petr, would it be possible to make an input diamond that do not require biasing and input caps..??

Also the ZVN/ZVP are much more symmetrical parts than the IRFs..
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Old 2nd February 2014, 08:43 AM   #255
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MiiB (254)
Hi petr, would it be possible to make an input diamond that do not require biasing and input caps..??
Also the ZVN/ZVP are much more symmetrical parts than the IRFs..



Hello, MiiB!
This requires a powerful complementary transistors with logic level control and high transconductance as IRL2910, IRL640
But I do not know them complementary


best regards
Petr
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Old 3rd February 2014, 05:31 PM   #256
kf_tam is offline kf_tam  Hong Kong
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Quote:
Originally Posted by Petr1951 View Post
Scheme can be greatly simplified if we use the type transistors Lateral. Duple difkaskad FET input impedance stabilizes.
Using a third-wire and resistor R20 provides a small negative output resistance, which reduces the noise on the wires because Back EMF.

http://s55.radikal.ru/i149/1402/9f/e2d0182a132e.png


best regards
Petr
Hi Pertr,

Can you reload the images?
Thanks!

Edward
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Old 3rd February 2014, 07:02 PM   #257
MiiB is online now MiiB  Denmark
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Here is the error correction output buffer
Attached Images
File Type: png Errocorrection.png (37.6 KB, 139 views)
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Old 3rd February 2014, 10:51 PM   #258
kf_tam is offline kf_tam  Hong Kong
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Quote:
Originally Posted by MiiB View Post
Here is the error correction output buffer
Thanks!
So it is based on two MOSFET differential pairs.
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Old 4th February 2014, 01:26 AM   #259
Struth is offline Struth  Canada
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Hi Guys

The distortion is quite a bit higher with the post-257 circuit compared to Lineup's.

A basic buffer should be way down in the ppm area especially at 1kHz.

Otherwise, it's an interesting idea.

Have fun
Kevin O'Connor
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Old 4th February 2014, 02:22 AM   #260
djk is offline djk
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"Here is the error correction output buffer "

I would suggest 1N4148 type diodes in series with each of the zener diodes.

The zener diodes have a non-linear capacitance with the audio voltage. The added diodes will allow this capacitance to charge up, but not discharge into the gates during normal operation.
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