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Thread: Voltage Amplifier
www.piclist.com/techref/power.htm?key=voltage
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face BY : Dan Michaels email (remove spam text)



At 05:33 PM 1/21/01 -0000, you wrote:
>I think if you want to use low cost opamps you will have to cascade them.
>Otherwise I think you will need an opamp with an extraordinary
>gain-bandwidth figure (the frequency in the opamp data table) something
>close to 400MHz!
>

Yes, for typical opamp with 1mhz GBW [LM358, LM324], max gain usable
at 40khz is only about 1Mhz/40khz = 25, and you probably need gain
>1000.

Might try LF353/TL082-84, with 4mhz GBW --> gain=100. Also, make
sure all cascaded stages are AC-coupled, including gnd leg gain
resistor, if single-ended supply being used:


                  |  \opamp
----.1uF---+------|+  \
           |      |    +----+------.1uF-- (repeat 2x or 3x)
          100K  +-|-  /     |
           |    | |  /      |
           |    |           |
          gnd   +----100K---+
                |
               1K
                |
              .1uF
                |
               gnd

Use another 100K resistor from "+" input to +Vcc, for single-ended
supply.

Lastly, play around a lot with ckt values.

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