verify nmos passes good logic 0 and passes bad logic 1.also verify that pmos passes good logic 1 and passes bad logic 0.
- 2 Answers
- 30719 Views
- Cosmic Circuits, HP, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / arpan
1. NMOS passes good logic 0 and bad logic 1.
We know the current conduction takes place when the channel
is formed i.e when Vgs > Vt(Threshold voltage). In normal
operation suppose Vg = 5v and Vs = 0v and Vt = 1v.
Fot the above mentioned case Vgs=Vg-Vs
=5v which is
grater than threshold voltage and logic 0 will easily pass.
Now if we want to pass logic 1, we have to make Vs=Vdd
(Suppose 5v). In this case Vgs=0v which is less than
threshold voltage, thus channel is not formed. And a bad
logic 1 is passed.
2. PMOS passes good logic 1 and bad logic 0
For normal operation suppose Vg = 0v and Vs = 5v
and Vt= -1v(threshold voltage for PMOS is -ve). So, Vgs =
-5v. So gate yo source voltage is more -ve and thus channel
will easily form, and logic 1 is passed easily. Now, suppose
Vs= 0v then Vgs=0v. Which is not -ve compare to Vt of PMOS,
thus channel will not form and will pass bad logic 0.
Refer pg 66 of Weste Harris
| Is This Answer Correct ? | 67 Yes | 7 No |
Answer / chakrapani
if vgs made more means more electronics are attraced to the
channel region so pinch off occures at large valves of vds
| Is This Answer Correct ? | 3 Yes | 7 No |
What transistor level design tools are you proficient with? What types of designs were they used on?
What types of CMOS memories have you designed? What were their size? Speed?
what are three regions of operation of MOSFET and how are they used?
For a 0.18um and 0.8um technology MOSFET, which has a higher cutoff frequency?
What is the depletion region?
What is pipelining and how can we increase throughput using pipelining?
Draw a CMOS Inverter. Explain its transfer characteristics
What are the different gates where boolean logic are applicable?
If the current through the poly is 20nA and the contact can take a max current of 10nA how would u overcome the problem?
What are the Factors affecting Power Consumption on a chip?
Given a circuit and asked to tell the output voltages of that circuit?
1 Answers Intel, Omega Healthcare,
What is latchup? Explain the methods used to prevent it?
86 Family 
