An NMOS amplifier is to be designed to provide a 0.50-V peak output signal across a 50-kΩ load that can be used as a drain resistor. What W/L ratio is required if μnCox = 200 μA/V2?

An NMOS amplifier is to be designed to provide a 0.50-V peak output signal across a 50-kΩ load that can be used as a drain resistor. If a gain of at least 5 V/V is needed, what value of gm is required?

A

0.1 mA/V

B

0.2 mA/V

C

0.4 mA/V

D

0.8 mA/V

An NMOS amplifier is to be designed to provide a 0.50-V peak output signal across a 50-kΩ load that can be used as a drain resistor. Using a dc supply of 3 V, what values of ID and VOV would you choose?

A

0.34 mA and 0.35 V respectively

B

0.34 mA and 0.69 V respectively

C

0.034 mA and 0.35 V respectively

D

0.034 mA and 0.69 V respectively

Various measurements are made on an NMOS amplifier for which the drain resistor RD is 20 kΩ. First, DC measurements show the voltage across the drain resistor, VRD, to be 2 V and the gate-to-source bias voltage to be 1.2 V. Then, ac measurements with small signals show the voltage gain to be −10 V/V. What is the value of Vt for this transistor?

A

0.7V

B

0.8V

C

0.9V

D

1.0V

Various measurements are made on an NMOS amplifier for which the drain resistor RD is 20 kΩ. First, DC measurements show the voltage across the drain resistor, VRD, to be 2 V and the gate-to-source bias voltage to be 1.2 V. Then, ac measurements with small signals show the voltage gain to be −10 V/V. If the process transconductance parameter is 50μA/V2, what is the MOSFET’s W/L?

A

25

B

50

C

75

D

100

The parallel combination of a 6.8 kΩ resistor and a 10 kΩ resistor is in series with the parallel combination of a 2.2 kΩ resistor and a 1 kΩ resistor. A 100 V source is connected across the circuit. The resistor(s) with the greatest voltage drop is (are)

A

6.8 kΩ

B

2.2 kΩ

C

6.8 kΩ and 10 kΩ

D

2.2 kΩ and 1 kΩ

An amplifier operating from ±3V provide a 2.2V peak sine wave across a 100 ohm load when provided with a 0.2V peak sine wave as an input from which 1.0mA current is drawn. The average current in each supply is measured to be 20mA. What is the amplifier efficiency?

A

20.2%

B

25.2%

C

30.2%

D

35.2%

Two resistors are in series: a 5.6 kΩ resistor and a 4.7 kΩ resistor. The voltage drop across the 5.6 kΩ resistor is 10 V. The voltage across the 4.7 kΩ resistor is

A

8.39 V

B

10 V

C

2.32 V

D

0 V

For a 0.8-μm CMOS fabrication process: Vtn= 0.8 V, Vtp = −0.9 V, μnCox = 90 μA/V2, μpCox = 30 μA/V2, Cox = 1.9 fF/μm2, VA (n-channel devices) = 8L (μm), and |VA| (p-channel devices) = 12L (μm). Find the small-signal model parameters (gm, ro and gmb) for an NMOS transistor having W/L = 20 μm/2 μm and operating at ID = 100 μA and |VSB| = 1V.

A

gm= 0.42mA/V, ro= 160 kΩ, gmb = 0.084 mA/V

B

for an NMOS transistor having W/L = 20 μm/2 μm and operating at ID = 100 μA and |VSB| = 1V. a) gm= 0.42mA/V, ro= 160 kΩ, gmb = 0.084 mA/V [ gm= 0.21mA/V, ro= 160 kΩ, gmb= 0.042 mA/V

C

gm= 0.42mA/V, ro= 80 kΩ, gmb = 0.042 mA/V

D

gm= 0.24mA/V, ro= 80 kΩ, gmb = 0.084 mA/V

A source maintains a current I in a resistor of resistor of resistance R. If V is the potential difference across the resistor. The electrical energy dissipated in the resistor in time is given _____

A

VI2t

B

V2It

C

IR2t

D

VIt

Consider the following statement: 1. Initial load tests and routine load tests are carried out on test piles and working Piles, respectively. 2. In a pile load test, the allowable load can be taken equal to half the ultimate load at which the total settlement amounts to one-tenth of the pile diameter. 3. In a pile load test, the allowable load can be taken equal to two-thirds of the total toad which causes a plastic settlement of 6 mm. Which of the above statements are correct?

A

1, 2 and 3.

B

1 and 2 only

C

1 and 3 only

D

2 and 3 only

An NMOS amplifier is to be designed to provide a 0.50-V peak output signal across a 50-kΩ load that can be used as a drain resistor. What W/L ratio is required if μnCox = 200 μA/V2?

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