Output Coupling Capacitor Free Audio Power Amplifier Dynamically Configured for Speakers and Headphones with Excellent Click and Pop Performance

An apparatus for monitoring a jack for a plug insertion, the jack having a first terminal driven by a signal and a second terminal that is separably coupled to the first terminal, the second terminal of the jack is decoupled from the first terminal when a plug is inserted into the jack, comprising:

• a first circuit that couples a supply voltage to the second terminal when the plug is in the jack;
• a compare circuit that generates a compare signal responsive to a comparison of the signal to a potential of the second terminal;
• an enable circuit that generates an enable signal when the signal is determined to be different from the supply voltage by a predetermined amount;
• and
• a memory circuit that stores the compare signal when enabled by the enable signal such that the memory circuit produces an output signal indicating the disposition of the plug in the jack.

A method of monitoring a jack for a plug insertion, the jack having a first terminal driven by a signal and a second terminal that is separably coupled to the first terminal, the second terminal of the jack is decoupled from the first terminal when a plug is inserted into the jack, comprising:

• coupling the second terminal to a power supply voltage when the jack is inserted;
• generating a compare signal responsive to a comparison of the signal to a potential of the second terminal;
• and
• storing the compare signal in a memory when the signal is different from the power supply voltage by a predetermined amount.

An apparatus for monitoring a jack for a plug insertion, the jack having a first terminal driven by a signal and a second terminal that is separably coupled to the first terminal, the second terminal of a jack is decoupled from the first terminal when a plug is inserted into the jack, comprising:

• means for coupling the second terminal to a power supply voltage when the jack is inserted;
• means for generating a compare signal responsive to a comparison of the signal by a potential of the second terminal;
• and
• means for storing the compare signal in a memory when the signal is different from the power supply voltage by a predetermined amount.