- #1
techyash
- 2
- 0
so i know that h11 is defined as v1/i1 when v2=0 and so on...but the thing is how do i do it practically...my professor told me that v1,i1,v2,i2 in h parameter equations are instantaneous values of current and voltage of ac in a bjt. he even wrote that to get h11, you have to set v2 of ac=0. but since, the lecture was a recorded one, i cudnt get it cleared.i have the following doubts-
1) how can v2 of ac be set to zero...if at all, say in ce config, i short the c and e terminals that is replace load resistance by a short circuit, how is it practically possible...
2) for h12, i will have to set i1=0 ie. in ce config, i will have to set i base as zero. which means i collector=0. which means that i2=0 which means h12 is infinity. not possible!
3) he told me to set v2=0, we use a capacitor... and for i1=0 we use an inductor at the base side...didnt get it.
4)on further reading on the net, i read that ib is kept constant so that i1 becomes zero..
i am all confused.pls help me asap
1) how can v2 of ac be set to zero...if at all, say in ce config, i short the c and e terminals that is replace load resistance by a short circuit, how is it practically possible...
2) for h12, i will have to set i1=0 ie. in ce config, i will have to set i base as zero. which means i collector=0. which means that i2=0 which means h12 is infinity. not possible!
3) he told me to set v2=0, we use a capacitor... and for i1=0 we use an inductor at the base side...didnt get it.
4)on further reading on the net, i read that ib is kept constant so that i1 becomes zero..
i am all confused.pls help me asap