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Purpose of this amplifier circuit with op. amplifiers

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ogden:

--- Quote from: Zero999 on February 05, 2019, 04:18:04 pm ---Yes, that capacitor was a bodge and isn't needed if the local feedback resistor network is configured correctly. Now the circuit is stable and there's no need to mess around with compensation capacitors.

--- End quote ---

It is not messing around but Miller Compensation :)
OP circuit may be demonstrator of exactly that - how to compensate unstable opamp.
https://www.edn.com/electronics-blogs/analog-bytes/4436589/Miller-Compensation-and-the-RHPZ-

Zero999:

--- Quote from: ogden on February 06, 2019, 09:30:32 am ---
--- Quote from: Zero999 on February 05, 2019, 04:18:04 pm ---Yes, that capacitor was a bodge and isn't needed if the local feedback resistor network is configured correctly. Now the circuit is stable and there's no need to mess around with compensation capacitors.

--- End quote ---

It is not messing around but Miller Compensation :)
OP circuit may be demonstrator of exactly that - how to compensate unstable opamp.
https://www.edn.com/electronics-blogs/analog-bytes/4436589/Miller-Compensation-and-the-RHPZ-

--- End quote ---
But it's tricky to select the correct capacitor, but it can avoided in this case just by configuring the feedback network properly. It works, because each op-amp is designed to be unity gain stable

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