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Analog Electronics

Analog Electronics
Which process is used for adding impurity into a pure semiconductor material ?

 Insulating
 Doping
 Conducting
None of these

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Analog Electronics
MOSFET uses the electric field of

  none of these.
  both (A) and (B).
  barrier potential of p-n junction to control the channel current.
  gate capacitance to control the channel current.

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Analog Electronics
The most commonly used amplifier in sample & hold circuits is

A unity gain non-inverting amplifier
An inverting amplifiers with a gain of 100
A unity gain inverting amplifier
An inverting amplifier with a gain of 10

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Analog Electronics
In n type semiconductor elements of which group of periodic table is added as dopant

 group 4.
 group 3.
 group 5.
 group 2.

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Analog Electronics
An npn BJT has gm=38mA/v, cµ =10¯14 F, cπ =10¯13F and DC current gain β0=90.For this transistor fT & fβ are

fT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz
fT =1.47 x 1010 Hz & fβ = 1.33 x 1012 Hz
fT =1.33 x 1012 Hz & fβ = 1.47 x 1010 Hz
fT =1.64 x 108 Hz & fβ = 1.47 x 1010 Hz

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Analog Electronics
Energy gap of semiconductor is approx

 1 eV.
 > 8 eV .
 0 eV.
 5 - 8 eV.

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