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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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