electrical engineering

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1. The Voltage Transfer Curve (VTC) for a CMOS inverter is below. 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0.0 0.2 0.4 0.8 1.0 1.2 0.6 V;(V) Use this VTC to find the inverter output voltage V. for the following input voltages V: (a) V=OV (b) Vi=0.4 V (C) Vi=0.6V (d) V=0.7V (e) V = 1.2 V 2. Five regions are labeled in the VTC below for a CMOS inverter. 1.8 1.6 1.2 1 Va(V) OX Region Region II Region IV Region V 0.6 04 0.2 0 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 For each of these regions, indicate the state of the PMOS and NMOS transistors: off, linear, or saturated. You might use the table below: Region PMOS state NMOS state I II III IV V 3. The Voltage Transfer Curve (VTC) for a CMOS inverter is below. 2.0 15 Vout 0.5 0.0 0.5 1.5 10 Vin (a) Suppose that your specs require the lowest output voltage for a high value to be Von = 1.7V. From the VTC, what input voltage would give you this voltage at the inverter output (b) Suppose that your specs require the highest output voltage for a low value to be VOL= 0.2V. From the VTC, what input voltage would give you this voltage at the inverter output 4. Suppose the specifications for a device give the following values: VIH = 1.4V VIL=0.5V Von = 1.8V Vol = 0.2 V What are the high and low noise margins for this device? 5. Estimate the transition time delay for an inventer connected to a capacitive load of size CL = 30fF. The inverter transistor parameters are: • Vo = 1.5V . For the NMOS transistor: - W = 500 nm - L=250nm - Ku=1004 - V 0.35 V • for the PMOS transistor: - W = 1000 nm -L=250nm - K, = 504 - Vp=-0.35V 6. For the inverter in Problem 5, what is the peak current during a transition from zero to one? 7. What are the three types of power dissipation in a CMOS logic circuit? 8. This problem is about computing the short-circuit power of an inverter. The inverter has the following parameters: • Vpp = 1.5V • V0.2V • Vip= -0.2V • fo = 3 GHz KW = 75044 . ?, Ety = 40ps Calculate the mean short-circuit current assuming a logic transition every clock cycle. What is the mean power? 9. This problem is about computing the dynamic power of an inverter. The inverter has the following parameters: . Vpp = 2.4V . Cu = 10F • folk = 2.1 GHz (a) Calculate the dynamic power assuming a logic transition every clock cycle. (b) Suppose that the activity coefficient a for this inverter is 0.3. What is the dynamic power?
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Running Head: CMOS INVERTER ASSIGNMENT

CMOS Inverter Assignment
Name
Instructor
Course
Date

1

CMOS INVERTER ASSIGNMENT

2
Question 1

a. 1.2V
b. 1.2V
c. 1.1V
d. 0.1V
e. 0.0V
Question 2
Region

PMOS state

NMOS state

I

linear

off

II

linear

saturated

III

saturated

saturated

IV

saturated

linear

V

off

linear

Question 3
a. 0.9V
b. 1.2V
Question 4
High noise margin = VOH − VIH ...


Anonymous
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