Sziklai circuit - Need the explanation of this circuit urgently

144

02:56:41

Hey , I came across this circuit for an interview , but I am not able to come up with an explanation. Could anyone explain this circuit to me , especially the current at 10k connected to pnp transistor ?
***************************************
Update:
Thanks to @BillyT for modifying the circuit and visualizing the current flow at the bases of the transistors , cool idea of connecting resistors of 1u ohm to show the current value

published 6 years ago

kiani

6 years ago

Biasing resistor.

sourabhm1

6 years ago

But , i am unable to show the current drop of 75.2 using equations . Could you explain me with the equations ? I verified theoritical calculations with the circuit , npn's calculations matches , but when i come to 10k biasing , i get stuck not knowing which formula is applied

sourabhm1

6 years ago

11.2 V , 3.3V , 3.9V , Voltage biasing currents at npn base , all its values are matching with the calculations , but when i take ic of npn as ib of pnp and try beta (assuming 100 for both transistors) , numbers go crazy and doesn't match up with theoretical calculations

sourabhm1

6 years ago

i got the value of current across the 10k connected to bias of pnp , so , does this current power up the pnp ?

sourabhm1

6 years ago

Finally I got the theoretical values matching with the simulation , I used KVL and KCL , thanks to my friend

kiani

6 years ago

Nice one.

BillyT

6 years ago

Check http://everycircuit.com/circuit/6228889496715264

sourabhm1

6 years ago

Thanks a lot @BillyT for proper visualization of the circuit

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.