公开(公告)号：US06928176B2

公开(公告)日：2005-08-09

申请号：US10436267

申请日：2003-05-13

Applicant: Wei Cheng Lin ,  Yung Ming Lee

Inventor： Wei Cheng Lin ,  Yung Ming Lee

IPC: H02B1/00 ,  H04R1/10 ,  H04R3/00

CPC classification number: H04R3/00

Abstract: The present creation is to provide a switching circuit built in IC for earphone and loudspeaker of portable information device, and there is no any passive component outside the IC, thus making the circuit board assembly more easily, saving the area of the circuit board, decreasing the volume and the cost. It is very suitable in designing a compact portable information device. In order to avoid any possible logic error during the switching between earphone and loudspeaker, the present creation provides a special unsymmetrical design in differential MOS circuit, and provides a current mirror circuit.

Abstract translation: 本发明是提供一种用于便携式信息装置的耳机和扬声器的内置IC的开关电路，并且在IC外部没有任何无源部件，因此使电路板组件更容易，节省了电路板的面积，减少了 体积和成本。 它非常适合设计紧凑型便携式信息设备。 为了避免在耳机和扬声器之间的切换期间的任何可能的逻辑错误，本发明在差分MOS电路中提供了特殊的不对称设计，并提供了电流镜电路。