Provided are a circuit for and a method of eliminating pop noise in a
digital audio amplifier using dual power supply, which are simple, drop
in price, and can be readily implemented in a semiconductor chip.
According to an existing technique, pop noise is eliminated using a
relay. However, in the present circuit and method, pop noise is
eliminated using the small number of discrete electronic devices. The
circuit for eliminating pop noise controls a voltage at a gate of a power
switch, i.e., a power MOS transistor, when power supply voltages are
applied and the application of power supply voltages is stopped.