N-channel Current Gain Cell

[kASD]

Hi everybody,

The circuit below act as an current cell, which has current gain but no voltage gain [Av=0.85]. This circuit uses an effective current source based biasing scheme and at input uses a p-channel mosfet and output uses 2 n-channel mosfets in pushpull manner in Class-AB or A [optional]. This circuit is self centered and very less DC offset will be present at the output.
Kindly give your views.

Turn Off the Lights ,Take a Deep Breadth and Relax , think about it in your mind.

 

[amplifierguru]

Hi Kanwar,

Oh goodness me, I think this is not good karma because Nch will cross-conduct if not driven from similar source impedance.

Greg

 

[kASD]

Oh Guru of amplifiers have a mercy on me and save me from the impact of the dreaded cross-conduction. Strike the cross-conduction with your almighty power and destroy it! do something to save me from the cross-conduction

 

[amplifierguru]

Oh goodness me, you can plead for salvation from the dreaded cross conduction but it will plague you! You must not use sloowww Nchannel as this will surely be your undoing.

 

[kASD]

welcome to party boys,

A slooow n-channel then where exist the forever faaast n-channel kindly show me the most vincent path to it with your farsighted heaven vision, i will definately pray for it or there will be another cause for its effect to be implemented,

 

[amplifierguru]

You must be choosing your own path to follow and be finding your own wisdom in the dawning of the new enlightenment. Tis not for me to lead but for you to follow. You must be learning this in your own time, befitting your karma.

You may pray but your prayers will fall on deaf ears without the passion and dedication to find the truth.

 

[kASD]

Kindly give the reasons to validate your point regarding the cross-conduction so that i could learn more about it in this circuit.

If you really feels that this circuit is suffering from cross-conduction
Then i have something to show you , look at the circuit below, is this also suffering from cross-conduction, if yes ,you are the winner in the game and someone or may be many of the others who dont know it dont agree with that all are the loosers.

here is a checkmate, be winner and In my opinion you are the winner and champ of the game.

Its a serious matter so please give the answer

 

[Bill Fitzpatrick]

Must be a full moon tonight.

 

[amplifierguru]

Hi Kanwar,

Yes I know it is Pch feeding Nch - but it will need to swing with that upper Nch all the way up! And, while the upper one can discharge through the Pch pull down, not so the lower one which only has a R to ground so a slow discharge.

How many coulombs for your N channels again?

 

[kASD]

Thats right, i agree with you, but is this all same for the second circuit also, kindly comment.

 

[lumanauw]

I hope Mr. Graham Maynard is here to talk about the principles of JLH topology/ Bengt Olson's non-compliment.

 

[kASD]

Anyone having the article of Bengt Olson's "better sound from non-complements"......i think one of you guys have access to it, if yes then kindly mail me.....

K a n w a r

 

[tschrama]

Hi Workshorse,

Your circuit in post 7 is good. I have build an amplifier with that topology and it worked nicely... both in class A and AB is has pretty low distortion...measurements are posted somewhere in diyaudio

 

[kASD]

As Greg said that the amp would cross-conduct than i am sure that the Anthony's n-channel amp also crossconduct and i also had that tested and the result was definately the cross-conduction...whereas Olson's circuit...i doubt it whether it cross-conducts or not..i have not yet built it but after building it the results would be clear......

regards,
K a n w a r

 

[tschrama]

Yeh yeh yeh it will crossconduct with 100KHz square wav, but if you thicker a bit with the gate-snoopers, you can minimize it to a degree that it functions pretty nicely... I haven't build anthony's N-channels amp.. so i don't know.. do you have the a schematic, could you post it?



Thijs

 

[kASD]

My friend has built Anthony's amp and it cross conducts at 20KHZ with 8 pairs of paralleled devices at output...so you have built olson's amp.it could be made to nill cross conduction by using drivers.....
Anthony's amp is just as i posted in post 7 [drvier N-channel]and olson's amp is just alike as i posted in post 1[driver p-channel]

K a n w a r