- #1

Terrycho

- 20

- 2

- Homework Statement
- I think there is a typo in my textbook (Basic electronics for scientists and engineers)

- Relevant Equations
- Bipolar Junction Transistor

The formula of current gain is I_out/I_in

If I call the current flows to R_e I_2, according to KCL, the following formula must be satisfied.

I_in + (β+1)I_b = I_2

Therefore, to know I_in, we should use the following

I_in = I_2 - (β+1)I_b

After a long calculation, I got g= - Re / (r_be + Re(β+1)) * Rc/(R_L+ Rc), which is the opposite sign of the value above in my textbook.

I cannot find the errata of the book, so I decided to ask here!

Thanks in advance.