Please post schematics as pictures (PNG tends to be the best choice).
There is many reason for this:
* Much smaller file size
* It doesn't take a lot of time to open the office application.
* User might not have an office compatible application installed.
* Other users can see the picture directly.
* Better chance to get help becase some users might not see your schematics
No, I'm sorry I doesn't. If I had, I would try to help. This amplifier of you is unknown. Is there any reasons for using two transistors in cascade?
First thought I had about this was to forget about Q2, and just calculate it the same way as for single transistor amplifier. But I'm not sure if this is the way.
BTW: You can also apply labels on the schematic. I recomend Faststone Image Viewer if bitmap is all you have.
funjoke said:
can anyone got the formula of how to find VB1 .i use the (R2/R1+R2)VCC.but the answer not correct.
I think this is a little hard to solve. Hard part is how to start. T.ex you have to take in account for that Ie on Q2 (Ic on Q1) is not the same as current from Rl because you have to add Ib on Q2 also.
this question need to sketch bode magnitude and bode phase plot for high frequency.(indicate all high cutoff frequencies,roll-off rate and phase shift)
Have you considering drawing this by hand? It's the least time-consuming task, because otherwise you have to find software, install software and learn to use software to do the drawing.