Motorola Solutions, Inc.
AUDIO SWITCHING CIRCUIT

Abstract:

Systems and methods for an audio switching circuit. One system includes an audio switching circuit including a first P-channel transistor including a first source terminal, a first gate terminal, and a first drain, a second P-channel transistor including a second source terminal, a second gate terminal, and a second drain terminal, and a control circuit. The second drain terminal is coupled to the first drain terminal. The first P-channel transistor is configured to receive a first audio signal at the first drain terminal. The control circuit is configured to disconnect the first gate terminal from a ground reference, and in response to the presence of the first audio signal, cause a first voltage between the first gate terminal and the first source terminal to be approximately zero and prevent the first audio signal from passing through the first drain terminal.