I was given a problem-based learning assignment that told me to find and explain the *circuit that consists of 2 or more LM741 op-amps. Based on my research, I only managed to find a "three op-amp instrumentation amplifier." That's a circuit structure that can amplify the differential signal while stripping off any common-mode voltage. It clashes with other team's topic, though, so I'm here to ask if there is any other circuit type that fulfills the question criteria that I mentioned above.

I just need suggestions on the circuit type's name and will do the research on my own afterward.

  • \$\begingroup\$ There are basically endless possibilities. You could look into analog pulse-width modulation (pwm), just to mention one example. \$\endgroup\$ Jan 15 at 7:33
  • \$\begingroup\$ It's called an Instrumental amplifier or INA for short, that uses laser-trimmer resistors for almost ideal CMRR. 120 dB = 1e6/1 \$\endgroup\$ Jan 15 at 7:36
  • 2
    \$\begingroup\$ A Google image search for "dual op-amp circuits" gives plenty of results. You might also be interested in reasons-not-to-use-a-741-op-amp on this site. \$\endgroup\$
    – Transistor
    Jan 15 at 8:07
  • \$\begingroup\$ here one : electronics.stackexchange.com/questions/604113/… \$\endgroup\$
    – Antonio51
    Jan 15 at 8:14
  • \$\begingroup\$ "problem-based learning assignment" = question!!! \$\endgroup\$
    – Andy aka
    Jan 15 at 9:57

In response to the last question of your posting I can list some very versatile filter circuits.

Under B) you can find so-called "Biquadratic" or "universal filters), which - at the same time - can provide three basic filter functions: Lowpass, highpass, bandpass (bandstop).

A) Two-opamp topology:

GIC-Filters (Generalized Impedance Converter) - most versatile topologies,

B) Three-opamp topologies

  • KHN-Filter (Kerwin-Huelsman-Newcomb),
  • Tow-Thomas,
  • Fleischer-Tow,
  • Akerberg-Mossberg,
  • Berka-Herpy,
  • Parallel structures

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