Graphical Method for Determining BJT Inverter Characteristics

[Dirac8767]

Hi I'm having some problems with using the graphical method to determine the output characteristics, the question and the answer are all included in the document attached. I understand the process of putting the load line on the graph but for this application i have no idea what to do.

Many thanks!

 

[Studiot]

Here are some hints:

Since we are working in milliamps use resistors in kohms.

V_out = 4.5 - 1.5I_c

Vin = 45I_base+0.65

So chose a series on I_base and note where your load line intersects that value on the transistor characteristic curves graph.
Move across the graph horizontally from this intersection to read off the value of I_c corresponding to that value of I_base

Substitute these pairs of values into the above equations to plot the V_out / V_in curve, as far as the noise limits given.

Does this help?