# analog.freak

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## analog.freak

's contributions
• 03.11.2015
• Quest for the Ideal Transistor?
• Dear Reader of this Blog: for the ultimate analysis of the CFA, please refer to Dr. Franco blog at https://www.edn.com/design/analog/4458753/In-defense-of-the-current-feedback-amplifier Ignore the rest.
• 12.01.2011
• Build an op amp with three discrete transistors
• I'd put a bleeding resistor between Q2's base and ground. It's reduce the open-loop gain, but at least it's help Q2's become less conductive during the positive alternations of the output. As is, the turn-more-on and turn-less-on alternations of Q2 are highly asymmetrical, with big implications on the circuit's stability characteristics.
• 08.23.2017
• In defense of the current-feedback amplifier
• Koo Moo: In response to your rant : "The expression for the output impedance that you gave using two port analysis is incorrect. Go figure out why, since you think I am incompetent:" I never gave you any expression for the output impedance. But, thanks for stating that it is incorrect.
• 08.23.2017
• In defense of the current-feedback amplifier
• Koo Moo: "you don't recognise" because you don't want to recognize, and you don't want to recognize because you just can't... The output buffer that you show as ideal in your Bazooka (short for "Bazoo Kiwanuka Amplifier") will no doubt exhibit a nonzero output resistance ro. You can't deny that. 2-port analysis approximates the node common to ro and RF as an "ac ground", so ro is kept out of 2-port calculations, indicating that it doesn't matter whether ro is or isn't there. This is one of the flaws of 2-port analysis, which you simply don't want to admit because it'd make your entire house of cards collapse. Return-ratio analysis, on the other hand, lumps ro with RF, and leads to exact calculations and/or measurements (note that lab measurements are impossible in 2-port analysis!). The presence of ro causes feedthrough around the gain node, which 2-port analysis fails to account for. Before you utter definite based-on-thin-air statements such as "they are plainly incorrect", you need to study the differences between the 2-P and R-R analyses in great detail! For this, you need not go too far: Like I did, you just study http://www.edn.com/electronics-blogs/analog-bytes/4430358/Two-port-vs--return-ratio-analysis- Do it, and when you're done, whether it takes you a week or a month, please do come back and let's move our conversation to a professional plane, ok?
• 08.23.2017
• In defense of the current-feedback amplifier