Brilliantly explained the negative feedback concept with the awesome example of cruise control.. So novel and intuitive teaching.. Great Admiration for you Prof. Razavi Sir☺🥰
01:25 - Intro and Feedback Examples 08:55 - "Without feedback we have untamed and poorly-controlled circuits and systems" 18:30 - General Negative-Feedback System 18:55 - Four Components of a Negative-Feedback System 26:25 - Notes 34:00 - Transfer Function of a Closed-Loop System 41:00 - Quiz: Determen zhe Error Signal in Terms of X 44:20 - "If the error is minimized X and U are very close"
In the notes @27:00, shouldn't we require k > 0 - otherwise we can add X and U but still get the same result with k = - 1 ? EDIT: ah, you point that out at @38:00 :)
You are right. If "x" is excatly equal to "u", there is no output. But as it is said in the lecture, the feedback signal is a good copy of the input signal which means it is approximately equal. A1 is quite large, therefore there is a signal in the output which can be calculated as it is said.
