0
In a class A amplifier, the active device (transistor) is biased so it always conducts some current, usually outputting about half the supply voltage under quiescent (no signal) conditions.
The input signal causes the transistor to conduct more or less current, thus raising or lowering the output voltage, but it never cuts off. For this reason, the class A amp is free from so-called crossover distortion that occurs in a class B push-pull amp when one device cuts off and the other starts to conduct.
The constant DC offset voltage with no signal is blocked by a capacitor or transformer so only the amplified AC signal appears at the output.
The advantage of a class A amp is its low distortion and transparent sound. The big disadvantage is the high quiescent bias current, even with no signal. Class A power amps require large heat sinks and/or forced-air cooling, and waste a lot of power, i.e. they are not very efficient.
Many audio enthusiasts feel the cleaner sound outweighs the drawbacks, and they pay big bucks for high-end class A amps and preamps.
Wiki User
∙ 6y ago
Add your answer:
Earn +20 pts
What is single tuned voltage amplifier?
it is a circuit consisting of a tuned circuit with a capacitor in parallel with inductor and it is connected to collector terminal in common emitter configuration,, and it is used as frequency receiver
What are the least efficient of class of amplifier?
class b amplifiers as for class b amplifier the 'Q' point is near to cut of region.
Class c amplifier advantage?
Efficiency of class C amplifier is approximately 100%.
What class of amplifier conducts for 100 percent of a cycle?
Class A. Wikipedia has a really good set of data to give you a start on understanding amplifier classes.
RF amplifier of an AM receiver is biased in?
class C
Why you use pushpull complementary symmetry for class B power amplifier?
Because the output device in a class B amplifier are biased at cutoff, they only amplify one half of the input waveform, so a complementary stage, biased at class B, is needed to output the other half. There are several circuit layouts to do this.
What is class AB push pull amplifier and give its circuit and description .?
"What is class AB push pull amplifier and give its circuit and description .?"
Which amplifier has more efficiency than class b amplifier?
Class C amplifier.. A class D amplifier is more efficient than class B, and is more efficient than class C as well.
What is single tuned voltage amplifier?
it is a circuit consisting of a tuned circuit with a capacitor in parallel with inductor and it is connected to collector terminal in common emitter configuration,, and it is used as frequency receiver
How much money does a Class T amplifier cost?
A Class T amplifier will typically cost around $20 to $40. The Class T amplifier is a small amplifier that produce a great amount of audio volume for it size.
What are the least efficient of class of amplifier?
class b amplifiers as for class b amplifier the 'Q' point is near to cut of region.
What is the main difference between a class 'A' and a class 'B' amplifier?
A class "A" amplifier amplifies the entire waveform, a class "B" amplifier only amplifies the first 1/2 of the wave form. See the images in the related link.
What is a advantage of class B amplifier?
class b amplifier is in between of a and c.so dont warry abt ds
What is the efficiency of class b linear RF AM amplifier?
the approximate efficiency of a class b linear RF AM amplifier is 35%
Class c amplifier advantage?
Efficiency of class C amplifier is approximately 100%.
What are the system applications of a class B amplifier?
Class B operated amplifier is used extensively for audio amplifiers that require high power outputs. Its also used as the driver and power amplifier stages of transmitters.
What configuration commonly employed in bipolar transistor amplifier?
Common Emitter - Class A Amplifier.
