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Analog Electronics

Analog Electronics
When VGS = 0 V, a JFET is

  saturated.
  cut off.
  an open switch.
  an analog device.

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Analog Electronics
The current gain of a pnp transistor is

 near zero.
 the ratio of collector current to emitter current.
 the collector current divided by the emitter current.
 the negative of the npn current gain.

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Analog Electronics
The opamp can amplify

  neither AC not DC signals.
  both AC and DC signals.
  AC signals only.
  DC signals only.

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Analog Electronics
The voltage follower has a

  closed - loop voltage gain of unity.
  small open - loop voltage gain.
  large closed - loop output impedance.
  closed - loop bandwidth of zero.

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Analog Electronics
In a normally biased npn transistor, the electrons in the emitter have enough energy to overcome the barrier potential of the

  base - emitter junction.
 collector - base junction.
 recombination path.
 base - collector junction.

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

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