This article dives deep into the mechanics of amplifier feedback loops, focusing on op-amp circuits and the impact of adding capacitance in the feedback loop. The author breaks down complex concepts in an accessible way, highlighting the role of feedback in analog signal processing. Surprisingly, the addition of a feedback loop does not change the op-amp’s gain but helps stabilize the IC’s behavior. The discussion also explores scenarios like delayed feedback leading to sustained oscillations and the impact of capacitors in introducing phase shifts. Overall, the article offers a detailed yet easy-to-understand look at feedback loops in op-amp circuits.
https://lcamtuf.substack.com/p/deep-dive-the-instability-of-op-amps