Hello All Experts,
I am just started my Analog IC design subject, I have lots of problems in understand concept introduce in lectures and books. I would like to ask about folded cascode.
Kindly look at the page at the following website.
From the circuit, I understand Current is split equally between Q1 and Q2. But may I know how we can tell(any equation?)Id3=Id4=Ibias1? Is it true the gate for Q11 & Q2 & Q4 are connected together?
Then may I know what is the goal for this circuits?
Kindly let me know the role for each part of the circuit(with equations);
1) Q1 and Q2: Is it the role just to divide the 2Ib equally?
2) Q3 and Q4: What are they for?
3) Q5 and Q6: What are they meant for?
4) Q7to Q10 : What are they for?
For this folded cascode, are all mosfets work in saturation region? Is there any hint or guide for student to know which operation region a particular mosfet or grouped of mosfet are in?
I know I have asked a lot of questions. But I really need help in understanding the basic circuit in order to follow the lectures. I read a few books and could not get much ideas. Kindly help me by explaining in details of the circuit and its operation so that I can start to analyse other circuit using the knowledge u have shown me here. I reeally wish you all can put in some time to help.
I really need help . Please
I thank you all in advance.
best regards and thanks