Asustek Computer Inc.

Cheng-Jan Chi

Chih-Wei Tsai

Hung-Yuan Li

Sheng-Fu Yang

Wen-Cheng Ko

Sheng-Neng Yu

Sheng-Ming Chang

An anti-pop circuit is coupled with a sound outputting device to prevent a 'pop' sound form being mixed into a sound signal. The anti-pop circuit includes a control signal generator and a fist diode. The control signal generator generates a control signal with a high level state and a low level state. The first diode couples with the sound outputting device. The sound signal is transferred to the first diode when said first diode is in a forward bias state, and the sound signal is outputted from an output end of the sound outputting device when the first diode is in a reverse bias state.

Anti-pop circuit

A positive differential signal trace and a negative differential signal trace are formed on different layers of a printed circuit board. A first ground trace is formed on the layer on which the positive differential signal trace is formed, and a second ground trace is formed on the layer on which the negative differential signal trace is formed. An insulation layer is positioned between the two layers and has a predetermined thickness. A differential mode impedance and a common mode impedance of differential signals are dependent on the predetermined thickness of the insulation layer, width and thickness of each differential signal trace, and a space between each differential signal trace and the corresponding ground trace formed on the same layer.

Differential signal layout printed circuit board

Growing community of inventors

Taipei, Taiwan

Cheng-Jan Chi