electronics circuits ii course-part 6-nmos dc circuits
Post on 09-Jul-2016
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Electronic Circuits II Course:
NMOS DC Circuits
Dr. Yehya H. Ghallab
Outline
• MOSFET Formulas
• MOSFET Circuits at DC
• NMOS Inverter with Resister Load
2
Outline
• MOSFET Formulas
• MOSFET Circuits at DC
• NMOS Inverter with Resister Load
3
MOSFET Formulas
4
Outline
• Introduction
• MOSFET Formulas
• MOSFET Circuits at DC
• NMOS Inverter with Resister Load
5
Example
6
Solution
7
Example
8
Solution
9
Outline
• Introduction
• MOSFET Formulas
• MOSFET Circuits at DC
• NMOS Inverter with Resister Load
10
NMOS Inverter with Resistor Load
11
• As the input voltage increases (VGS
), the drain to source
voltage (VDS
) decreases and the transistor inter into the
nonsaturation (linear) region.
• If VI <VTN , the transistor is in cutoff and iD = 0, there is no voltage drop across RD, and the output voltage is Vo=VDD=VDS
• If VI >VTN , the transistor is onand initially is biased insaturation region, sinceVDS > VGS -VTN .
NMOS Inverter with Resistor Load
12
If VGS <VTN , the transistor is in cutoff and iD = 0, there is
no voltage drop across RD, and the output voltage is
Vo=VDD=VDS
NMOS Inverter with Resistor Load
13
NMOS Inverter with Resistor Load
14
NMOS Inverter with Resistor Load
15
NMOS Inverter with Resistor Load
16
Summary of NMOS inverter with
Resistor Load
17
Example
For the NMOS inverter shown inFig. V
DD= 3V. Assume transistor
parameters of K’n = 60 μA/v2,W/L = 5, and V
TN= 0.5 V.
(a) Find the value of RD
such thatvo
= 0.1 V when vI= 3 V.
(b) Using the results of part (a)determine the transition pointfor the driver transistor
18
Solution
19
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