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Analog Electronics

Analog Electronics
The majority carriers in the emitter of a PNP transistor are

 free electrons.
 pentavalent atoms.
 trivalent atoms.
 holes.

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

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Analog Electronics
Ignoring the bulk resistance of the collector diode, the collector-emitter saturation voltage is

  0.
 supply voltage.
 1 V.
 a few tenths of a volt.

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Analog Electronics
In CB configuration, the output V-I characteristics of a transistor are drawn by taking

  VCB versus IB for constant IE.
  VCE versus IC for constant IE.
  VCB versus IC for constant IE.
  VCB versus IB for constant IE.

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Analog Electronics
When the pn junction is forward biased the sequence of events that take place are

  diffusion, injection and drift.
  diffusion, drift and recombination.
  injection, diffusion and recombination.
  none of above.

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Analog Electronics
An amplifier using an opamp with slew rate SR=1v/µsec has a gain of 40db.if this amplifier has to faithfully amplify sinusoidal signals from dc to 20 KHz without introducing any slew-rate induced distortion, then the input signal level must not exceed

795mV
79.5 mV
395mV
39.5mV

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