barcode font for excel 2007 free download Figure 356 The locations of various bias Q points for different amplifier classes in Software

Drawing UPC A in Software Figure 356 The locations of various bias Q points for different amplifier classes

Figure 356 The locations of various bias Q points for different amplifier classes
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Figure 357 A Class A amplifier s output waveform
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Simply by decreasing the Q point of the amplifier a small amount, Class AB operation is reached (Fig 358) This class of operation has a little higher efficiency than Class A since the static output current (IC) through the amplifier will be smaller, and will also flow for something less than a complete cycle when a signal is present, normally around 300 degrees in power amplifier applications This type of bias can also be used in small-signal linear amplifiers because the modest input signal amplitude is unable to push the amplifier into cutoff But any Class AB single-ended power amplifier will display more output distortion than a Class A type because of the output clipping of the signal s waveform However, Class AB is a common bias for push-pull audio power amplifiers, as well as very linear RF push-pull power amplifiers Class B bias efficiency is quite high: with no input signal, nearly zero power dissipation occurs within the amplifier This is a result of the almost complete absence of collector current flow, since the bias is just barely decreased to overcome the 06 V of the base-emitter junction When a signal is placed at the input, the output current will flow for approximately 180 of a full cycle (Fig 359) This conduction will only occur when a half cycle of the signal forward biases the base, while the other half cycle will reverse-bias the emitterbase, creating a lack of output However, considering that the Class B amplifier acts as a half-wave rectifier amplifying only half of the incoming signal it is normally found only in push-pull power amplifier arrangements Class C amplifiers are even more efficient than Class B bias, since they consume only a small leakage current when no input signal is present When an input signal is inserted, a Class C will amplify for less than half of the input signal s cycle, and will really supply only a pulse at its output port The conduction angle will be 120 degrees or less (Fig 360), because the emitter-base junction is, in fact, slightly reverse biased Many Class C schemes, however, may not use any bias at all, since silicon transistors, because of their 06-V emitter-base barrier voltage, will not conduct until this voltage is overcome by the input signal As a pulsed output is unusable for most wireless purposes, this pulse must be changed back into a sine wave by a tuned circuit (see Flywheel effect in the Glossary) or filter, which will also decrease the harmonic output level With the flywheel effect reconstructing the missing alternation, the output of a Class C
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Figure 358 A Class AB amplifier s output waveform
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Figure 359 A Class B amplifier s output waveform
Figure 360 A Class C amplifier s output waveform
amplifier will also have a peak-to-peak voltage that is double the VCC of the power supply Class C amplifiers are found in FM driver stages, single-ended nonlinear RF power output stages, mixers, and active frequency multipliers
Amplifier biasing circuits A transistor amplifier must be biased with resistors
and a power supply for a couple of reasons Foremost, we would need two separate voltage supplies to furnish the desired class of bias for both the emittercollector and the emitter-base voltages This is still done in certain
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