Re: designing a base bias grounded emitter amplifier.

On Apr 1, 5:54 pm, "Charles Schuler" <charleschu...@xxxxxxxxxxx>
wrote:
<eook...@xxxxxxx> wrote in message

news:1175448316.255957.321750@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx





I'm a EET student and I have to find values for a base bias grounded
emitter amplifier given the following properties.
a. Beta DC,and AC are both 160
b.Vbe= 0.7V
c.Tj=72 degrees ferenhiet, or Vt =25.5mV
d. Q point Vce=Vc=0.5Vcc
e. Unloaded Voltage gain Av = -100
f. Output resistance = 2Kohms.

I have to find theses values for the amplifier.
a.Rc
b. r'e
c.ie
d. VCC
e. Rb
f.Rin (input resistance).

Use a 2 k ohm collector resistor (Rc). If Vce = Vc, then there is no
emitter resistor and already it is a stupid homework problem.

Use the gain and Rc to determine r'e and that will lead you to the emitter
current and then you can divide by Beta dc + 1 to find the base current and
then you can use Kirchhoff's voltage law and Ohm's Law to find Rb. Again,
it is a stupid homework problem. You might want to find a better school.

The input resistance is roughly Beta x r'e in parallel with Rb. Vcc is up
for grabs, by the way and can be selected before you start.

APRIL FOOL!- Hide quoted text -

- Show quoted text -

I worked out the problem and these are the numbers i got Ic =.
001267mA, Ie= .001275mA, Vcc = 3.034V, Rb =291750Kohms,and Rin =
3200ohms

.

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