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  Our product audio amplifier has a leading edge in terms of sound, durability and EMC performance. We pay special attention to energy efficiency, make full use of the cost of saving system functions, such as for automotive applications start and stop function. We offer the highest output power for an integrated solution. You are free to choose, with our large number of product mix, mixed with D and AB products. In addition, in order to optimize your design, we work with leading design support teams to provide in-depth product knowledge.
The audio amplifier output stage is directly connected to the loudspeaker (sometimes through the capacitor). If the output stage uses a bipolar junction transistor (BJT), they typically operate in a linear mode with a collector-emitter voltage. The output stage can also be implemented using the MOS transistor.
All linear output stages consume power because nonvolatile IDS and VDS are generated on at least one output transistor in the process of generating VOUT. The size of the power consumption is very much related to the offset used by the output transistor.
Class A transistor topology uses one of the transistors as a DC current source to provide the maximum audio current required by the loudspeaker. The output level of Class A amplifiers may be good, but the power consumption is too large because the DC bias current flowing through the output stage transistor (here we do not need) is often large and does not flow to the loudspeaker Is what we want).
Class B amplifier topology without DC bias current, the power consumption is much smaller. The output transistor is controlled individually by a push-pull method, giving the MH device a positive current to the loudspeaker and the ML device to absorb negative current. This reduces the power consumption of the output stage, and only the signal current flows through the transistor. However, Class B amplifier circuit sound quality is poor, this is because the output current is too zero, there is a non-linear behavior (crossover distortion), the transistor in the on / off state changes.
The audio amplifier is a mixture of Class A and Class B, using a certain DC bias current, but much smaller than the pure Class A design. Very small DC bias current is enough to avoid crossover distortion, good sound quality. Power consumption is between Class A and B, but is usually closer to Class B. Similar to the control of Class B circuits, there is a need for some control that allows Class AB circuits to supply or draw large output currents.

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