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Old 2nd July 2013, 09:31 AM   #71
AndrewT is offline AndrewT  Scotland
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The output transistor becomes less Thermally stable as Vce rises.
Cordell gives an arithmetic procedure to predict the onset of this unstable voltage. Basically, you need higher Re values for higher Vce in both BJTs and mosFETs.
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Old 12th July 2013, 09:48 AM   #72
400kg is offline 400kg  Turkey
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Default scope caps and problem

positive portion of the output wave is problematic. why is this happening?
Attached Images
File Type: jpg Harmonic problem 2.jpg (134.4 KB, 429 views)
File Type: jpg 350KHz sin.jpg (390.8 KB, 394 views)
File Type: jpg Square Test.jpg (368.2 KB, 350 views)
File Type: jpg sapphire final.jpg (599.5 KB, 400 views)

Last edited by 400kg; 12th July 2013 at 09:58 AM.
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Old 12th July 2013, 02:33 PM   #73
Bensen is offline Bensen  Belgium
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Have you set your scope at DC or AC input signal? When set at DC is could be that you are seeing a DC-offset on the output?
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Old 12th July 2013, 02:53 PM   #74
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Quote:
Originally Posted by Bensen View Post
Have you set your scope at DC or AC input signal? When set at DC is could be that you are seeing a DC-offset on the output?
Hi.My friend has made this measurements.The first picture is both ac as you can see on the top of oscilloscope screen. Amplifier's output is asymmetric.What can we do?
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Old 12th July 2013, 06:44 PM   #75
Bensen is offline Bensen  Belgium
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I am just thinking out loud:
An error like this should normally be corrected by feedback, so, could it be caused by something out of the loop? For example the VI-limiter?

The scope picture is with 26v output signal, do you have the same error with smaller output voltages?
Could you measure again without the limiter?
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Old 13th July 2013, 06:24 AM   #76
400kg is offline 400kg  Turkey
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Hi
Mr. Bensen

you're right. I'll try again after removing the servo and protection circuit.
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Old 19th July 2013, 04:03 PM   #77
400kg is offline 400kg  Turkey
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amp is not the problem. there is the problem of oscilloscope calibration.
respects.
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Old 19th July 2013, 07:12 PM   #78
400kg is offline 400kg  Turkey
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Default NEW CONCEPT EXCELINEAR

a new concept of performance, no dc offset problem.
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Old 20th July 2013, 06:12 AM   #79
alex mm is offline alex mm  Europe
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..... Hmmm ,congrats as usual from you ,nice schematic , but have you built , or just simulated ? Off course a decent PCB it's needed .
Regards ,
Alex
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Old 20th July 2013, 08:51 AM   #80
400kg is offline 400kg  Turkey
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Hi, Mr. Alex,
Not tested yet.
I've tested in simulation.
Subject to change.

Last edited by 400kg; 20th July 2013 at 08:55 AM.
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