Re: PaX amplifier: invitation to discussion
Posted: Fri Sep 19, 2014 7:52 amDear Mr. Didden,
Thank you for the wonderful implementation of error correction topology in your paX amplifier design.
The Output Current Stage (Cos), described in part-1 of the article on paX, achieves an error corrected unity gain current amplifier, while the Voltage amplification stage (Vas), described in part-2 of the article on paX, achieves an error corrected gain of 20.
The two separately designed Output Current Stage (Cos) and the Voltage amplification stage (Vas) helps everyone understand the novel use of the 'current conveyor.'
However, I was wondering if it is possible to modify the Vas to completely eliminate the current amplifier stage. That will get rid of a lot of hardware. My thoughts may be biased by long exposure to negative feedback topologies which makes me see that the Vas is designed in a very generic way. So kindly bear with me.
Also, while the error correction topology works at minimizing the distortion, the current dumping topology does that and also eliminates the tedious task of setting the bias current and other thermal stability. I am eager to know that besides elimination of crossover distortion, does the Class-A/Class-AB stages used in current dumping also offer better thermal efficiency.
Do you think it is worth re-visiting the Current Dumping Amplifier with new devices if it has more/better advantages?
You have vast experience, access to elaborate equipments and labs. Could I have your views on the the two topologies compared side by side? Is there any possibility that a hybrid of the two be possible? If you have already compared/ heard the two topologies, which I am sure you have, can you share any insights with us here?
I eagerly look forward to your reply.
Thanks and regards,
Ravindra.
Thank you for the wonderful implementation of error correction topology in your paX amplifier design.
The Output Current Stage (Cos), described in part-1 of the article on paX, achieves an error corrected unity gain current amplifier, while the Voltage amplification stage (Vas), described in part-2 of the article on paX, achieves an error corrected gain of 20.
The two separately designed Output Current Stage (Cos) and the Voltage amplification stage (Vas) helps everyone understand the novel use of the 'current conveyor.'
However, I was wondering if it is possible to modify the Vas to completely eliminate the current amplifier stage. That will get rid of a lot of hardware. My thoughts may be biased by long exposure to negative feedback topologies which makes me see that the Vas is designed in a very generic way. So kindly bear with me.
Also, while the error correction topology works at minimizing the distortion, the current dumping topology does that and also eliminates the tedious task of setting the bias current and other thermal stability. I am eager to know that besides elimination of crossover distortion, does the Class-A/Class-AB stages used in current dumping also offer better thermal efficiency.
Do you think it is worth re-visiting the Current Dumping Amplifier with new devices if it has more/better advantages?
You have vast experience, access to elaborate equipments and labs. Could I have your views on the the two topologies compared side by side? Is there any possibility that a hybrid of the two be possible? If you have already compared/ heard the two topologies, which I am sure you have, can you share any insights with us here?
I eagerly look forward to your reply.
Thanks and regards,
Ravindra.