Analog Electronics 2 - Low Frequency Cutoff

[@theelectronicsengineeringt5805]

Thank you Professor. It was very well lecture. I hope your channel will grow drastically.

[@ChaojianZhang]

10:15 - Why is that short circuit current 1/(r_s + r_{OB})? Can you give me a breakdown of the analysis steps? 10:32 - Here we talk about "DC" gain, i.e. when frequency is zero, but I am just wondering since we are looking at the "small signal model" how can that apply to DC? Aren't we supposed to look at the DC circuit itself? Or do they happen to have the same impedances? 12:09 - I am just wondering why this diagram is not exactly the mid-band pass as we saw at the beginning of the lecture. Maybe it doesn't matter, but are there any connections? 12:33 - We had three capacitor/resistor pairs (aka. time constants) before, how come we choose Wp3 for this? 17:22 - The example asks about "total capacitance", are we simply talking about the sum of all capacitors?

[@theelectronicsengineeringt5805]

dc means, frequency near 0. When frequency is too near to f= 0,