Audio circuit and mobile terminal provided with audio circuit

A mobile terminal, comprising an audio circuit, wherein the audio circuit comprising a main circuit board and a sub-circuit board disposed to be separated from the main circuit board which are two independent circuit boards;

• the main circuit board comprising an audio codec chip circuit, a radio frequency circuit and a main circuit board reference ground;
• the sub-circuit board being provided with a microphone circuit, an antenna circuit, a sub-circuit board reference ground, a decoupling capacitor and a first anti-static device;
• and
• the audio codec chip circuit being configured to provide a bias voltage for the sub-circuit board through a transmission line in the main circuit board, the antenna circuit being electrically connected to the radio frequency circuit, and the microphone circuit being electrically connected to the audio codec chip circuit;
• the microphone circuit comprising a microphone audio differential positive electrode output pin, a microphone audio differential negative electrode output pin and a microphone bias voltage pin, and the microphone audio differential positive electrode output pin and the microphone audio differential negative electrode output pin being both connected to the audio codec chip circuit;
• and
• the decoupling capacitor and the first anti-static device being connected in parallel and then being connected to the transmission line, and the transmission line being connected to the main circuit board reference ground through the decoupling capacitor and the first anti-static device which are connected in parallel.