A CMOS Digitally Controlled, Low Power, Variable Gain Headphone AmplifierDavid Bowlus, Lu Luo, Jonathan YamotyAbstractWe are building a multiple stage audio power amplifier using CMOS processes. The amplifier is to be designed for small, portable applications, and will have an output that is matched for a set of headphones. We are going to design the output stage to have an output impedance between 75Ohm and 150Ohm, which is typical for a set of headphones. The amplifier will also employ a volume control that adjusts the gain of a single stage to obtain a different power level at the output. We will try to minimize the power consumption of the amplifier, since the audio amplifier will be used in portable devices such as MP3 players and compact disc players. We will also try to minimize THD in order for this device to have a reasonable level of sound quality. Files |