Current conveyor as a voltage amplifier - Page 21 - diyAudio
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Old 18th February 2013, 06:00 AM   #201
bcarso is offline bcarso  United States
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Quote:
Originally Posted by smms73 View Post
Dado it looks very good
How about using those supertex depletion mosfet in place of the jfet's? They have higher early voltage than the 2sk170 at those low Vds. I just do not know if they are noisier.
I will buy some of this deplection mosfets for triyng some ideas.
You can also cascode the main current sources for higher output impedance of the ccs. But your regulator is very good as it is.
They are a bit noisier, especially at low frequencies.
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Old 18th February 2013, 07:30 AM   #202
dadod is offline dadod  Croatia
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Originally Posted by keantoken View Post
There is a way to find out.
I will try to explain why I think it was not good idea at least for my shunt regulator.
1. I whant to regulate both sides + and - with one trimer for that.
2. I tried not to uze zener diode as reference(used in Borbely simple shunt reg) as that defeat poit 1.(and it is noisier).
3. Output impedance is low enough, a wires could input higher impedance.
4. To spare a diodes is not so important as above points.
dado
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Old 18th February 2013, 07:40 AM   #203
dadod is offline dadod  Croatia
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Quote:
Originally Posted by smms73 View Post
Dado it looks very good
How about using those supertex depletion mosfet in place of the jfet's? They have higher early voltage than the 2sk170 at those low Vds. I just do not know if they are noisier.
I will buy some of this deplection mosfets for triyng some ideas.
You can also cascode the main current sources for higher output impedance of the ccs. But your regulator is very good as it is.
Thanks ssms73,
I have a bunch of different small jfets and only TO220 supertex type, and they are noisier as bcarso pointed out.
Cascoding of the ccs, I think, is not very needed.
dado
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Old 19th February 2013, 11:39 PM   #204
smms73 is offline smms73  Portugal
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Quote:
Originally Posted by bcarso View Post
They are a bit noisier, especially at low frequencies.
I was afraid of that. anyway I will buy some to experiment.
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Old 19th February 2013, 11:44 PM   #205
smms73 is offline smms73  Portugal
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Originally Posted by dadod View Post
Cascoding of the ccs, I think, is not very needed.
dado
Walt jung have writing some articles about current sources to use with regulators.

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Old 20th February 2013, 12:56 AM   #206
bcarso is offline bcarso  United States
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Originally Posted by smms73 View Post
I was afraid of that. anyway I will buy some to experiment.
Walt's recommendation was the reason I tried them and tested them in fact. They are not too bad, but there is no guarantee, no specification for noise, and it is highly process-dependent. But those Supertex parts I tried were not as bad as I feared and would be quite adequate for many situations (like plate loads for hybrid tube circuits, which was my application at the time).

Brad
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Old 20th February 2013, 01:13 AM   #207
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You're right Dadod, I didn't think about how the zener would act as a reference. I'm a total go for the regulator as it is, FWIW. Keep up the good work.
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Old 20th February 2013, 05:33 AM   #208
dadod is offline dadod  Croatia
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Originally Posted by keantoken View Post
You're right Dadod, I didn't think about how the zener would act as a reference. I'm a total go for the regulator as it is, FWIW. Keep up the good work.
Thanks Kean, I appreciate your support.
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Old 1st March 2013, 09:28 AM   #209
dadod is offline dadod  Croatia
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Discussion, in an other thread, about the need to have SUPER HIGH bandwidth was the reason to do some FFT simulation at 20kHz, 100kHz and 1MHz.
Here are the simulations only, I hope that the real result will be not far from it.
dado
Attached Images
File Type: jpg GainWire-gain4x-fft20k.jpg (183.2 KB, 203 views)
File Type: jpg GainWire-gain4x-fft100k.jpg (184.3 KB, 195 views)
File Type: jpg GainWire-gain4x-fft1M.jpg (169.2 KB, 185 views)
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Old 1st March 2013, 06:29 PM   #210
MiiB is offline MiiB  Denmark
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Sergio.. would it be possible to make something like the circuit in post #180 with balanced in..??
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