1
\$\begingroup\$

I'm making the following circuit:

Given a source that can be represented as a voltage generator that generates signals in the range of -1.5 V to -1 V, having a series resistance of 100 Ω, design and manufacture an amplifier, even multi-stage, that meets the following characteristics:

  • The output signal must be between 0 and 5 V + 5%
  • The frequency response must have a low-pass characteristic with a cut-off frequency of 40 kHz ± 10%

The op-amps that I can use are:

  • UA741
  • LM358
  • MCP6292
  • OP07

Because my idea was to use an input buffer to reduce noise I had to apply a first-order low-pass filter with a cut-off frequency of 40 kHz.
Finally I wanted to amplify the signal and use an adder so I could get the desired signal.
I'll show you the calculations below. Would you have any advice?

enter image description here

enter image description here

\$\endgroup\$
5
  • 5
    \$\begingroup\$ Hi, can you add the calculations and ask a specific question, because the answer to your only question if there is any advice is simply yes. \$\endgroup\$
    – Justme
    Commented Jan 27 at 10:11
  • 2
    \$\begingroup\$ You should choose your op-amp based on what power supply is available to use. Don't let the tail wag the dog in other words and, don't use a 741 because they are really poor devices. \$\endgroup\$
    – Andy aka
    Commented Jan 27 at 10:11
  • 2
    \$\begingroup\$ Can you include a schematic of what you have designed/planned thus far? It is difficult to give much assistance from only a limited written description. \$\endgroup\$
    – Nedd
    Commented Jan 27 at 11:20
  • \$\begingroup\$ yes, please show us the calculations, as promised! Together with a schematic, so we can follow them. Do that within your question! That's good preparation for a lab, by the way, so you're going about this the right way. \$\endgroup\$
    – Marcus Müller
    Commented Jan 27 at 11:34
  • \$\begingroup\$ I added my scheme according to you it is only achievable with 3 stages Also, are the formulas correct? I had checked that I have to power the opamps at least at +10V and -10V to avoid risking saturation problems I was also thinking of using LM358, but I don't know what gain to give for each stage do you have any advice? \$\endgroup\$
    – monika
    Commented Jan 28 at 8:19

0

Reset to default

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Browse other questions tagged or ask your own question.