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 In a class A amplifier, the transistor conducts for
the full cycle of the input signal (360°)
 used in low-power applic...
BJT Class B AmplifiersBJT Class B Amplifiers
 When an amplifier is biased such that it operates in the
linear region for ...
BJT Class B AmplifiersBJT Class B Amplifiers
Small-Signal Amplifier OperationSmall-Signal Amplifier Operation
 In a common-emitter amplifier, the input signal is
appl...
Small-Signal Amplifier OperationSmall-Signal Amplifier Operation
Copyright © The McGraw-Hill Companies, Inc. Permission re...
Small-Signal Amplifier OperationSmall-Signal Amplifier Operation
Common-Collector AmplifierCommon-Collector Amplifier
 The common-collector CC amplifier is used to provide
current gain a...
Common-Collector AmplifierCommon-Collector Amplifier
Copyright © The McGraw-Hill Companies, Inc. Permission required for r...
Common Base AmplifierCommon Base Amplifier
 The common-base CB amplifier is used less often than the
CE or CC amplifiers....
Common Base AmplifierCommon Base Amplifier
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproductio...
L7 bjt amplifier
L7 bjt amplifier
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L7 bjt amplifier

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L7 bjt amplifier

  1. 1.  In a class A amplifier, the transistor conducts for the full cycle of the input signal (360°)  used in low-power applications  The transistor is operated in the active region, between saturation and cutoff  saturation is when both junctions are forward biased  the transistor is in cutoff when IB = 0  The load line is drawn on the collector curves between saturation and cutoff BJT Class A AmplifierBJT Class A Amplifier
  2. 2. BJT Class B AmplifiersBJT Class B Amplifiers  When an amplifier is biased such that it operates in the linear region for 180° of the input cycle and is in cutoff for 180°, it is a class B amplifier  A class B amplifier is more efficient than a class A  In order to get a linear reproduction of the input waveform, the class B amplifier is configured in a push- pull arrangement  The transistors in a class B amplifier must be biased above cutoff to eliminate crossover distortion
  3. 3. BJT Class B AmplifiersBJT Class B Amplifiers
  4. 4. Small-Signal Amplifier OperationSmall-Signal Amplifier Operation  In a common-emitter amplifier, the input signal is applied to the base and the output signal is taken from the collector.  Cin is an input coupling capacitor that couples ac but blocks dc.  CE is an emitter bypass capacitor that provides a low- impedance path for ac signals between the emitter terminal and ground.
  5. 5. Small-Signal Amplifier OperationSmall-Signal Amplifier Operation Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
  6. 6. Small-Signal Amplifier OperationSmall-Signal Amplifier Operation
  7. 7. Common-Collector AmplifierCommon-Collector Amplifier  The common-collector CC amplifier is used to provide current gain and power gain.  The voltage gain equals approximately one, or unity.  The collector is common to both the input and output sides of the amplifier.  The input signal is applied to the base, while the output is taken from the emitter.  The output signal is in phase with the input signal.  The CC amplifier is usually referred to as an emitter follower.
  8. 8. Common-Collector AmplifierCommon-Collector Amplifier Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.  CC amplifier circuit which is also called an emitter follower.
  9. 9. Common Base AmplifierCommon Base Amplifier  The common-base CB amplifier is used less often than the CE or CC amplifiers.  The common-base amplifier provides a high voltage and power gain but the current gain is less than one.  The common-base amplifier has an extremely low input impedance, zin.  The CB amplifier provides some desirable features for operation at higher frequencies.  The CB amplifier is also used in a differential amplifier which is used in linear integrated circuits known as op amps.
  10. 10. Common Base AmplifierCommon Base Amplifier Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. The base is grounded.  The input signal, Vin, is applied to the emitter and the output is taken from the collector.

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