Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 02 Feb 2018 My Price 9.00

MOSFET amplifier


Consider the MOSFET amplifier shown in Figure 7.70. Assume that the amplifier is operated under the saturation discipline. In its saturation region, the MOSFET is characterized by the equation:

 

Where iDS is the drain-to-source current when a voltage vGS is applied across its gate to-source terminals. vO RL VS + - vDS iDS G FIGURE 7.70

a) Draw the equivalent circuit for the amplifier based on the SCS model of the MOSFET.

b) Write an expression relating vO to iDS.

c) Write an expression relating iDS to vI.

d) Write an expression relating vO to vI.

e) Suppose that an input voltage VI results in an output voltage VO. By what factor must VI be increased (or decreased) so that the output voltage is doubled?

f) Suppose, again, that an input voltage VI results in an output voltage VO. Suppose, further, that we desire an output voltage that is 2VO. Assuming that both the input voltage and the MOSFET do not change, what are all the possible ways of accomplishing the desired doubling of the output voltage?

g) The power consumed by the MOSFET amplifier in Figure 7.70 is given by VSiDS, assuming that no current is draw out of the vO terminal. Which of the alternatives for doubling VO from parts (e) and (f) will result in the lowest power consumption?

 

Answers

Maurice Tutor
(5)
Status NEW Posted 02 Feb 2018 11:02 PM My Price 9.00

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