Amplifiers are used in a wide variety of applications. Generally, amplifiers are employed in applications where the voltage or current of a signal needs to be increased. A typical power amplifier used in audio devices is formed with low voltage drop NPN transistors. Although the output stage is characterized by a relatively low voltage drop, the presence of two feedback loops, whose gain is difficult to control because they are tied to the maximum output current that may be delivered, requires the use of an external RC network to ensure adequate stability characteristics. Conventional audio systems contemplate a separate speaker and amplifier. Generally, a heat sink associated with the amplifier dissipates heat generated by a power stage of the amplifier. Generally, the heat sink is selected based upon the maximum power handling requirements of the power stage. There exists a need for an integrated amplifier to provide a high maximum output current with a minimum voltage drop through the output stage of the amplifier. An integrated amplifier-preamplifier provides mixing capabilities for mixing a plurality of input sources and equalization of either the input and/or output sources from the amplification system. In many applications and particularly in audio equipment, low frequency, power amplifiers that drive the loudspeakers very often use a bridge configuration. Integrated power amplifier arrangements with a plurality of stages between which a matching filter circuit is provided, can advantageously be employed in radiofrequency amplifiers.
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