Yarrow
Member level 2
tranistors
Hi
I have some difficulties understanding how transistors that are open at all times affect the voltage. If you see in the attachment, transistors M79(PMOS) and M66(NMOS) are always open. There is a DC current (2-3nA) going through the string given by M4. Furthermore M1 is open when M41 is closed and opposite. This makes the voltage between M1 and M41 (lets call it node N) to rise and fall.
So, what I dont understand is how M79(open) and M66(open) affect the voltage at node N. Can these open transistors be considered as "moscap"?
The thing I observed when including M66, the voltage level at node N increases when M41 is closed and M1 is open. What might be the cause of this? Increased resistance towards ground?
Based on simulation results, the use of M79 makes the voltage at node N to go high faster and thereby reduces delay. Anyone has any idea why?
Tnx in advance
Hi
I have some difficulties understanding how transistors that are open at all times affect the voltage. If you see in the attachment, transistors M79(PMOS) and M66(NMOS) are always open. There is a DC current (2-3nA) going through the string given by M4. Furthermore M1 is open when M41 is closed and opposite. This makes the voltage between M1 and M41 (lets call it node N) to rise and fall.
So, what I dont understand is how M79(open) and M66(open) affect the voltage at node N. Can these open transistors be considered as "moscap"?
The thing I observed when including M66, the voltage level at node N increases when M41 is closed and M1 is open. What might be the cause of this? Increased resistance towards ground?
Based on simulation results, the use of M79 makes the voltage at node N to go high faster and thereby reduces delay. Anyone has any idea why?
Tnx in advance