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power amp driver block topology?
power amp driver block topology?
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Old 17th September 2003, 11:46 AM   #11
peranders is online now peranders  Sweden
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power amp driver block topology?
DrG and MikeK and Fred = Na + paper + H2O
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Old 17th September 2003, 12:19 PM   #12
Bricolo is offline Bricolo  France
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Quote:
Originally posted by peranders
DrG and MikeK and Fred = Na + paper + H2O
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Old 17th September 2003, 12:20 PM   #13
phase_accurate is offline phase_accurate
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So do you think one should keem them separately ?

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Charles
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Old 17th September 2003, 01:56 PM   #14
DrG is offline DrG  South Africa
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phase_accurate: keem?
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Old 17th September 2003, 03:38 PM   #15
Fred Dieckmann is offline Fred Dieckmann  United States
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Default Keeping it Technical

"who i am sure doesn't need Fred Dieckman pontificating ill-informed rubbish on his behalf"

You mean a Technical disscussion like that?

http://hyperphysics.phy-astr.gsu.edu.../npncb.html#c1

http://www.odyseus.nildram.co.uk/Cas...JT_Circuit.htm

A cascode uses a common base transistor to minimize the voltage varations across the other transistor in the cascode. It doesn't have a signal driving the base of the transistor that provides the cascode. All the temper tantrums in the world are not going to change the definition of a cascode or a common base circuit. Pick some resistor values and compare the circuits with Spice. Go back to couple of text books and read what cascode circuits are designed to do. I would like to discuss this circuit but I am not going to put up with temper tantrums because someone does not understand a circuit and would rather resort to diversionary tactics than actual disscuss the circuit in any detail. I have been to many design reveiws and have never seen the design choice dictated on the merit of who could shout the loudest. You guys are bitching at the wrong guy..........

BTW is there anybody actually trying to disscuss the circuit but me at this point?
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Old 17th September 2003, 04:04 PM   #16
john curl is offline john curl  United States
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I agree with Nelson Pass on this. I have used that connection since 1973 or even before. The folded cascode connection is mainly trivial, but it doesn't appear to hurt anything and probably gives a little more gain. The way to test this would be to make a Spice simulation and then add a very large cap from R(1) to ground. Compare with and without the added cap.
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Old 17th September 2003, 04:05 PM   #17
phase_accurate is offline phase_accurate
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Quote:
phase_accurate: keem?

It should read keep

Regards

Charles
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Old 17th September 2003, 04:14 PM   #18
DrG is offline DrG  South Africa
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Fred, what you say is correct, 100% on the money. The problem is that you say it in such a way as to belittle others. So rather than coming across as helpful, knowledgeable and intelligent, you sound instead noisy, irritating and abrasive...
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Old 17th September 2003, 05:30 PM   #19
Elso Kwak is offline Elso Kwak  Philippines
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Question Symmetrical?

Hi Michael,
First I would ask myself if I would design a symmetrical , completely complementary, circuit or not. Then I would use FET's at the input.
The arrangement of the left schematic I have seen before. SAE? , Borbely???
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Old 17th September 2003, 06:34 PM   #20
Fred Dieckmann is offline Fred Dieckmann  United States
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Default Fred, what you say is correct, 100% on the money. No, I am never 100%....

If people will focus on content instead of personalities we would not have to go down this road. I have been reasonable and still been abused. It seems that who's signature is at the bottom matters more than the content. I am thrilled to have Mr. Curl comments as I have seen this topology before and wondered about it relative benefits. I will offer a preemptive apology for the real possibility a Mr. Know-it-all will be along to tell him he doesn't know what he is talking about as well. If the guy is smarter than Nelson he must by smarter the John too. I go on about cascodes since the subject of what constitutes a real cascode with its benefits in bandwidth and linearity. I was even talking to JAM on the phone about cascodes on the phone yesterday. No name calling or hurt feelings were involved. Ask him. Once again....... you guys are bitching at the wrong guy.
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