Three working states of power amplifier tube

The low-frequency power output stage is classified into Class A, Class B, and Class C according to the working state of the power amplifier tube.

They have their own characteristics:



(1). The main advantage of Class A power output stage is low distortion, and the main disadvantage is low efficiency.

Its output power Po, power consumption PD, collector maximum power consumption Pcmax and efficiency are:

Po = Ec2 / 2RL PD = 2Ec2 / RL

Pcmax = 2Ec2 / RL = 4Po η = Po / PD = 1/4 = 25%

(2) The main advantage of Class B power output stage is high efficiency, and the main disadvantage is the existence of severe crossover distortion.

Its output power Po, power consumption PD, collector maximum power consumption Pcmax and efficiency are:

Po = Ec2 / 2RL PD = 2Ec2 / πRL

Pcmax = 2Ec2 / π2RL? 0.4Po η = Po / PD = π / 4 = 78%

(3). Class A and B power output stage absorbs the advantages of Class A and Class B, so it is widely used,

But its circuit structure is more complicated than Class A and Class B. As shown below:


Technical area detailed analysis of Doherty power amplifier design load traction principle (top) detailed analysis of Doherty power amplifier design how to improve efficiency (bottom) analysis of voltage follower input and output error analysis Solve the effect of power amplifier on emi

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The bending and forming of the metal plate is carried out on the bending machine. Place the workpiece to be formed on the bending machine, lift the brake shoe with the lifting lever, slide the workpiece to the proper position, and then lower the brake shoe to the workpiece to be formed, and realize the bending of the metal by applying force to the bending lever of the bending machine.

Sheet Metal Forming Process

Sheet Metal,Forming Mount Unit,Laser Cutting Cover,Sheet Metal Forming Process

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