our classes going on with hybrid model of transistor.i am including my class notes,pls clear my doubts in my basics.....
consider CE circuit,
the 4 variables are ib,ic,vb,vc.Among this ib and vc are taken as independent variable.
//(DOUBT)why ib ,vc are taken as independent and why not vb and ic are taken as independent variable.pls tell me the reason ?(DOUBT)//
continuing....
vb=f1(ib , vc)
ic =f2(ib ,vc)
Making taylor series expansion,we get
Δvb=(∂f1/∂ib) Δib + (∂f1/∂vc) Δvc
Δic=(∂f2/∂ib) Δib + (∂f2/∂vc) Δvc
//(DOUBT)why we are making taylor series expansion here...(DOUBT)//
continuing...
(∂f1/∂ib )= (∂vb/∂ib) = hie
(∂f1/∂vc) = (∂vb/∂vc) = hre
(∂f2/∂ib) = (∂ic/∂ib) = hfe
(∂f2/∂vc) = ( ∂ic/∂vc) = hoe
thus *vb = hie ib + hre vc*
* ic = hfe ib +hoe vc*
please solve my 2 doubts...............
consider CE circuit,
the 4 variables are ib,ic,vb,vc.Among this ib and vc are taken as independent variable.
//(DOUBT)why ib ,vc are taken as independent and why not vb and ic are taken as independent variable.pls tell me the reason ?(DOUBT)//
continuing....
vb=f1(ib , vc)
ic =f2(ib ,vc)
Making taylor series expansion,we get
Δvb=(∂f1/∂ib) Δib + (∂f1/∂vc) Δvc
Δic=(∂f2/∂ib) Δib + (∂f2/∂vc) Δvc
//(DOUBT)why we are making taylor series expansion here...(DOUBT)//
continuing...
(∂f1/∂ib )= (∂vb/∂ib) = hie
(∂f1/∂vc) = (∂vb/∂vc) = hre
(∂f2/∂ib) = (∂ic/∂ib) = hfe
(∂f2/∂vc) = ( ∂ic/∂vc) = hoe
thus *vb = hie ib + hre vc*
* ic = hfe ib +hoe vc*
please solve my 2 doubts...............