AUDIO SWITCH CIRCUIT WITH SLOW TURN-ON

摘要

An audio switch circuit includes negative feedback paths and a transistor that serves as a switching component. The negative feedback paths are turned ON to couple a source voltage and a drain voltage of the transistor to the gate of the transistor when the audio switch circuit is turned ON. The negative feedback paths reduce the slew rate of the gate-to-source voltage of the transistor, thereby slowing the turn-ON of the audio switch circuit to prevent or minimize unwanted audible noise. The negative feedback paths can be turned OFF after a period of time after the audio switch circuit is turned ON for improved total harmonic distortion.

主权项

1. A switch circuit comprising:
a transistor having a gate, a source, and a drain; a first negative feedback path that turns ON to couple a source voltage on the source of the transistor to the gate of the transistor when the switch circuit is turned ON; and a second negative feedback path that turns ON to couple a drain voltage on the drain of the transistor to the gate of the transistor when the switch circuit is turned ON, wherein the transistor couples a signal through the source and the drain of the transistor when the switch circuit is turned ON.