Well, it is not related to filtering, but low output impedance is a fairly important aspect of any power supply and this circuit enables it due to the common-collector configuration of the BJT. Nevertheless, no doubt that there is a huge misconception about the statements given in the Cadence presentation. Suggestion to all electrical engineers - please use relevant references to learn electronics (Sedra-Smith, Gray-Meyer, etc). Thanks for a nice video lecture!
If i'm understanding this correctly, you only consider a miller capacitance to be a capacitor multiplier circuit( capacitor across input to output). The bjt filters merely let you design for lower currents, and thus you can make r smaller without making the capacitor larger. Essentially you can move your pole into higher frequencies without needed a larger capacitor. The misconception being this effect does not actually increase capacitance in any way.
Thanks for your comments. There are other cap multiplier circuits that entail current amplification rather than voltage amplification (like base to emitter in BJT).
Do you have a suggestion for alternative circuits that filter that noise? I feel that it is especially important for suppressing 60hz ripple without having massive capacitors to charge
Thank you for the great informations can you please makes a lecture about capacitor control circuit with dual mosfet for resonance maintaining circuits
13:21 I guess a solution is to combine a normal RC filter with small R to cut high frequencies with the RC+BJT (with higher R) to deal with lower ones (so you don't need a huge C)
@@sambenyaakov unfortunately yes. That's why you have to use a small R and can't filter low frequencies unless you have a ridiculously big capacitor. But that's OK if that tasks is done by the BJT+RC.
Ive used this circuit to remove a very small ripple on a 200V DC Supply. I needed to have a very clean output voltage and the load was minimal because it was for a supply for a sensor. What would you recommend instead in this case? I have to say it was a really good solution because it was easy, small and power used was minimal because of low current.
Thanks for your input. Indeed you can, but better to add resistance to Rf to get a lower frequency break point. On the other hand , if the current drops you may still not have a sufficient voltage drop with the Rf.
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Thank you again sir for clarifying this industry wide misconception, I have seen this in many electronic books, even from the University.
Indeed, Thanks for comment.
Great video!! Maybe do a video about negative resistance devices and uses?😊
Great suggestion! Will try. Thanks.
Hello Professor, thank you for sharing your knowledge, wish you the best from Romania!
Thanks
Well, it is not related to filtering, but low output impedance is a fairly important aspect of any power supply and this circuit enables it due to the common-collector configuration of the BJT. Nevertheless, no doubt that there is a huge misconception about the statements given in the Cadence presentation. Suggestion to all electrical engineers - please use relevant references to learn electronics (Sedra-Smith, Gray-Meyer, etc). Thanks for a nice video lecture!
👍🙏
Hello, professor. Thank you so much for your videos! Very well explained and very informative. Greetings from Argentina!
Thank you for your kind note.
Thank you for the explanation and analysis! It has been very helpful!
Thank you.
wonderful clarification, thank you
Thanks
Professor Hello ,Thanks a lot for this clarfication, God bless you .
Thanks for warm words.
If i'm understanding this correctly, you only consider a miller capacitance to be a capacitor multiplier circuit( capacitor across input to output). The bjt filters merely let you design for lower currents, and thus you can make r smaller without making the capacitor larger. Essentially you can move your pole into higher frequencies without needed a larger capacitor. The misconception being this effect does not actually increase capacitance in any way.
Thanks for your comments. There are other cap multiplier circuits that entail current amplification rather than voltage amplification (like base to emitter in BJT).
Do you have a suggestion for alternative circuits that filter that noise? I feel that it is especially important for suppressing 60hz ripple without having massive capacitors to charge
I will try to touch on it in a forthcoming video. Thanks for your comment.
Thanks Professor!
Thanks
Thank you for the great informations
can you please makes a lecture about capacitor control circuit with dual mosfet for resonance maintaining circuits
Will try
Gracias !!!!❤
👍🙏
13:21 I guess a solution is to combine a normal RC filter with small R to cut high frequencies with the RC+BJT (with higher R) to deal with lower ones (so you don't need a huge C)
But in the 'nirmal' RC filer the current will pass via the R?
@@sambenyaakov unfortunately yes. That's why you have to use a small R and can't filter low frequencies unless you have a ridiculously big capacitor. But that's OK if that tasks is done by the BJT+RC.
Ive used this circuit to remove a very small ripple on a 200V DC Supply. I needed to have a very clean output voltage and the load was minimal because it was for a supply for a sensor. What would you recommend instead in this case? I have to say it was a really good solution because it was easy, small and power used was minimal because of low current.
Thanks for sharing.
Awesome !
👍🙏
@@sambenyaakov I hope you and your family is safe over there ! Thinking of you
@@k7iq thnks. Thanks for concern. We are personally OK but under a lot of tension. Hoping for a resolution soon
@@sambenyaakov Glad you are OK. It has to be hard. Things will be fine, I'm sure.
7:21 I wonder if we could add a diode in series with Rf to increase the voltage drop.
Thanks for your input. Indeed you can, but better to add resistance to Rf to get a lower frequency break point. On the other hand , if the current drops you may still not have a sufficient voltage drop with the Rf.
👍🙏❤️
😊👍🙏
Very interesting, thank You!
and some bla-bla-bla in order to make this content rated as it should
Some content is missing?
@@sambenyaakov Why? I meant adding some extra words for youtube algorithms to advance this