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CC and CB amplifiers The dc current gain of an emitter follower is: 0 1 dc Dependent on r'e The output voltage of an emitter follower is:

CC and CB amplifiers


  • The dc current gain of an emitter follower is:
  • 0
  • 1
  • ßdc
  • Dependent on r'e


  • The output voltage of an emitter follower is:
  • In phase with vin
  • Much greater than vin
  • 180˚ out of phase
  • Generally much less than vin


  • An emitter-follower buffer is generally used when:
  • RG << RL
  • RG = RL
  • RL << RG
  • RL is very large


  • For maximum power transfer, a CC amplifier is designed so:
  • RG << zin
  • zout >> RL
  • zout << RL
  • zout = RL


  • If a CE stage is directly coupled to an emitter follower:
  • Low and high frequencies will be passed
  • Only high frequencies will be passed
  • High-frequency signals will be blocked
  • Low-frequency signals will be blocked


  • An emitter follower circuit always makes the source resistance
  • ß times smaller
  • ß times larger
  • Equal to the load
  • Zero


  • The amplifier configuration that produces a 180˚ phase shift is the:
  • CB
  • CC
  • CE
  • All of the above


  • The ac emitter resistance of an emitter follower
  • Equals the dc emitter resistance
  • Is larger than the load resistance
  • Is ß times smaller than the load resistance
  • Is usually less than the load resistance


  • A common-base amplifier has a voltage gain that is
  • Much less than one
  • Approximately equal to one
  • Greater than one
  • Zero


  • An application of a common-base amplifier is when:
  • Rsource >> RL
  • Rsource << RL
  • A high current gain is required
  • High frequencies need to be blocked


  • A common-base amplifier can be used when
  • Matching low to high impedances
  • A voltage gain without a current gain is required
  • A high-frequency amplifier is needed
  • All of the above


Frequency Effects


  • In a BJT amplifier circuit, C'e is the same as
  • Cbe
  • Cib
  • Cibo
  • Any of the above


  • In a BJT amplifier circuit, increasing the value of Cin and Cout will:
  • Decrease at low Av at low frequencies
  • Increase Av at low frequencies
  • Decrease Av at high frequencies
  • Increase Av at high frequencies


  • Input coupling capacitors in FET circtuis
  • Are normally larger than in BJT circuits
  • Determine the high-frequency cutoff value
  • Are normally smaller than in BJT circuits
  • Are treated as ac opens


  • On FET data sheets, Coss is
  • Equal to Cds + Cgd
  • Equal to Cgs - Crss
  • Equal to Cgd
  • Equal to Ciss - Crss

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