# Amplifier/Electronic question

1. May 10, 2010

### breeno

1. The problem statement, all variables and given/known data

"The graph shows the characteristics of four different voltage amplifiers (A-D). The input voltage to these amplifiers is limited to between + & - 600mV.

If you cannot see it properly it also says "If the input voltage is as shown (see bottom graph), sketch the output voltage for amplifiers B and D."
2. Relevant equations

Voltage gain = change in output voltage divided by change in input voltage.

3. The attempt at a solution

To use B as an example. I've tried finding the voltage gain (rise over run or the formula above) to get 8.33. I then use that as the voltage gain and rearrange the above formula but alas it didn't work. If it helps, the book shows (for B) a peak voltage of 1.8v and a trough of 1.8v.

Any help would be appreciated.

2. May 10, 2010

### collinsmark

For B, your rise over the run approach is the way to go. But you might want to redo the math. The way I see the figure (which isn't too easy, it's kind of squashed), the output voltages seems to around 5.0 V for an input voltage of around 0.55 V. That doesn't give a gain of 8.33.

3. May 11, 2010

### breeno

It's 5v and 0.6v. :p

5/0.6 = 8.33.

4. May 11, 2010

### collinsmark

Yeah, it's kind of hard for me to see because the figure is squished up. On the other hand, if you use 5/0.55 = 9.09, you'll get the answer in the book. I'm not sure if the book made a mistake in the figure, or the answer, or if it's just because I just can't interpret the figure very well myself.

5. May 12, 2010