All Questions
Tagged with nmos digital-logic
22
questions
3
votes
1
answer
53
views
Voltage drop in NMOS inverter with enhancement load
In the enhancement load NMOS inverter, why is the voltage drop across M2 at least equal to Vth when VIN is low ?
Is it because for M2 when VIN is low the voltages VGS = VDS, so VDS > VGS - Vth and ...
- 63
0
votes
2
answers
242
views
What is the difference between an N-MOS FET and a tri-state buffer? [closed]
Is an N-MOS FET an equivalent of a tri-state buffer, where the source is the input, the gate is the enable, and the drain is the output?
- 109
1
vote
0
answers
89
views
Electric-lock control via NMOS matrix
Currently I am working on the design that allows to control 8x8 electric lock matrix via PIC16F877A.
As in comments for somebody it was not obvious (btw it was mentioned) I am using 64 electric locks ...
- 13
0
votes
1
answer
245
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the inverter switching point
As we know the mobility of the "nmos" device is 3x greater than "pmos", and when we want to correct the switching point of an inverter for vdd/2 we usually change the W of the &...
-1
votes
2
answers
599
views
How do you go from gate level to transistor level?
Is there a good method to go from circuit at gate level or truth table to transistor level, other than trial and error?
I have an example here to illustate what I am asking.
We have the function \$X=(...
1
vote
1
answer
615
views
PMOS/NMOS current direction and digital logic
What happens when the PMOS source is connected to negative Vcc (-Vcc).
What I understand is that when the gate voltage is <=0 then the drain-source is connected. Normally I would expect current to ...
- 17
0
votes
0
answers
76
views
NMOS Cascode Logic
I have following problem and I ask you ,if possible, any help to resolve it.
Size the following circuit so that it achieves a 100 ps delay (50-50) using 0.25 μm devices, while driving a 100 fF load ...
1
vote
1
answer
159
views
Finding inverting vs non inverting functions
I'm learning CMOS systems and I'm struggling with the PMOS and NMOS part of it. So for example given F=minterms(m0,m1,m2...) I can do the kmap and get the function ...
- 11
0
votes
2
answers
751
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How does logic 1 get passed through an NMOS pass transistor?
I'm studying pass transistors. One thing I came across in several of the books is that when an NMOS has a logic state HIGH and the input terminal (the schematic below) is also HIGH, the output ...
0
votes
2
answers
278
views
Finding output voltage of a MOSFET using its datasheet
Given a supply voltage of 4800 mV to a resistor loaded NMOS inverter with a single Nmosfet (2N7002) and a 6 ohm resistor, what would be the output voltage when the input voltage is 3500 mV?
How should ...
- 23
2
votes
2
answers
41
views
Is sum of currents equal to capacitor current for NMOS Inverter with Capacitor as Load?
I found this in my lecture notes and could not understand how drain current is equal to sum of load and (IL) capacitor currents (ICL) given in the figure for a NMOS Inverter with capacitor load. By ...
- 23
0
votes
4
answers
891
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Details regarding PMOS and NMOS transistors used as gates
My lab instructor explained very briefly what transistors are and started by naming them NPN and PNP then switched to PMOS and NMOS and I (as well as my classmates) am very confused, I need someone to ...
- 181
1
vote
2
answers
3k
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Understanding the working of a NAND GATE using NMOS Transistors
I'm having incredible difficulties understanding how the "Switching Behaviour" (not sure if that's the correct English translation- in German it is "Schaltverhalten") for NMOS and PMOS transistors ...
- 143
0
votes
2
answers
3k
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Deriving the NOT logic gate using PMOS logic
I recently started learning about Field Effect Transistors (FET's) and about the MOS circuit family. From my understanding NMOS is made from a p-type substrate and n-type source/drain, whereas the ...
- 143
0
votes
2
answers
1k
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Output impedance of a logic inverter using an NMOS
I have drawn below an NMOS logic inverter and its equivalent circuit for HIGH state:
Why is this gate said to have high output impedance at HIGH state? Is that because of the open switch or because ...
- 2,217