00:02 Op-Amp is a block with a differential input and a single-ended output. 02:18 Op-amp gain can be calculated using differential pair analysis. 04:55 The Op-Amp has a gain of 50 and an output impedance of 12.5 kilohms. 07:21 Using a transistor as a current source to make a basic op-amp. 09:44 Op-Amp design involves various components working together for signal conversion. 11:51 Design considerations for driving a load with an op-amp. 14:28 Op-Amp gain can be improved using cascode configuration. 16:41 Cascode current mirror improves output resistance and current matching. 19:15 Total gain is GM 1 times the output resistances of the components. 21:38 Biasing methods affect op-amp performance. 23:44 Designing a current source to feed the transistor. 25:59 Consider resistive load for efficient design Crafted by Merlin AI.
13:27, Hi Professor What do you mean by "if we want to get 3V swing", we should let the current source be 60mA? Do you mean that if we want leg room of the input of this source follower to be as large as possible? As I understand, increasing the current of this current source only makes the NMOS easier to turn on. The maximum value of Vin is always Vdd+VT, and the mininum Vin is Vs+VT. So It just makes Vs lower when NMOS is off. Am I right? Thanks!
Vt(threshold voltage of nmos) is very low compared with Vin, which is neglected here for discussion. 60mA is ac component swing output signal across load 50 ohm.
