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Old 14th January 2009, 05:47 PM   #151
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catalin,
well in that case... keep it that way.
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Old 14th January 2009, 05:51 PM   #152
catalin is offline catalin  Romania
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And the problem is solved by chosing with atention the resistor in the mirror(220),the resistor in input vas(2.2k) and the negative feedback from the emitter vas(75 ohms) .
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Old 14th January 2009, 05:53 PM   #153
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Catalin the designs in that thread especially the first 2 are exactly what you have, taking away the cascodes.

You going to play a lot around with values, keep in mind that real transistors have do not match so well compared to simmed ones.
If this type of biasing worked we would have already seen thousands of amps using it, look at the date of that thread 2003, there are threads even earlier than this.
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Old 14th January 2009, 06:16 PM   #154
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Quote:
Originally posted by Lumba Ogir
catalin,
well in that case... keep it that way.

Lumba, even with the simetrical amp the open loop to 20khz is still 65db
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Old 14th January 2009, 06:46 PM   #155
catalin is offline catalin  Romania
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For everyone ,I just simulate most defavorable case ...
One of the input transistor with a beta common-100.
The dc output is increasing with 30mV from the original (200uV) .
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Old 14th January 2009, 07:23 PM   #156
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catalin,
we should leave it hanging.
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Old 14th January 2009, 08:20 PM   #157
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Default can i say one idea?

about crossover distortion...
put a mix of CFP and EF
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Old 7th February 2009, 10:55 AM   #158
catalin is offline catalin  Romania
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Default Let's discuss a little abot Current feedback !

Let's discuss a little about current feedback amps .
I obtain with this circuit :
Slew rate 200V/uS . Phase margin > 70 degrees .Thd 0.0001 % .Open loop gain 137 db ; 90db at 20khz !
Bandwith 22mhz without input filter .
What disadvantages ant what advantages it brings ?
I think that the stability is one problem .
What do you think ?
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Old 7th February 2009, 02:46 PM   #159
Stee is offline Stee  Italy
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Default very intresting Catalin

if Q88 is 2SA1302 maybe more stable
because in CFP OS --> hFE paramenter is foundamental
between complementary in common collectors

also

have just one point to drive Output Stage... see figure

can improve stability because front-end have a common load
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Old 7th February 2009, 08:50 PM   #160
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Default see this circuit

on ebay

http://stores.ebay.it/Blekok-Ham-and...Parts-Kits-DIY
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