Hi,
For the following circuit determine the voltages VG,VC and VD
VG
\(
VG=25 V *(18kOhm)/(18kOhm*91kOhm)=4,12 V
\)
For determing Vc i need to know the value of the current Ic of the BJT.
For determing Ic do i need to determine Id first?
For determing Ib (not sure if this equation is correct)
\(
Vcc= 330kOhm*Ib+VBE
15V=330kOhm*Ib+0,7V
Ib=43,3uA
\)
\(
Ic=beta*Ib=160*(43,3uA=6,928mA
Vc=1,1kOhm*6,928mA=7,6208 V
\)
I need to know what the value of the current Id and Vgs in order to determine the value of VD right?
Can i determine VD from this equation:
\(
Vcc=VC+VCE+VD+VDS
Vcc=VC+(VC-VD)+VDS
\)
Suposing that the BJT works in the ative region therefore IE is equal to Id
\(
Id=Idss(1-(Vgs)/(Vp))^2
6,298mA=6mA(1-(Vgs)/(-6 V))^2
Vgs=-1,788 V
\)
How can i determine VD and VDS from what i already know..
Thanks
For the following circuit determine the voltages VG,VC and VD
VG
\(
VG=25 V *(18kOhm)/(18kOhm*91kOhm)=4,12 V
\)
For determing Vc i need to know the value of the current Ic of the BJT.
For determing Ic do i need to determine Id first?
For determing Ib (not sure if this equation is correct)
\(
Vcc= 330kOhm*Ib+VBE
15V=330kOhm*Ib+0,7V
Ib=43,3uA
\)
\(
Ic=beta*Ib=160*(43,3uA=6,928mA
Vc=1,1kOhm*6,928mA=7,6208 V
\)
I need to know what the value of the current Id and Vgs in order to determine the value of VD right?
Can i determine VD from this equation:
\(
Vcc=VC+VCE+VD+VDS
Vcc=VC+(VC-VD)+VDS
\)
Suposing that the BJT works in the ative region therefore IE is equal to Id
\(
Id=Idss(1-(Vgs)/(Vp))^2
6,298mA=6mA(1-(Vgs)/(-6 V))^2
Vgs=-1,788 V
\)
How can i determine VD and VDS from what i already know..
Thanks
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