| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a technology for improving characteristics of a balance amplifier when a power amplifier mounted in a mobile communication device such as a cellular phone, is constituted of the balance amplifier. <P>SOLUTION: One of features of the embodiments is disposing a passive component to be disposed on a low-band signal negative path and a passive component to be disposed on a low-band signal positive path at positions which become symmetric with respect to a centerline CL1 of a semiconductor chip CHP. Thus, symmetry of the low-band signal negative path and the low-band signal positive path is improved. As a result, a matching loss caused by a path difference between the low-band signal negative path and the low-band signal positive path can be sufficiently reduced and characteristics of a low-band signal balance amplifier can be improved. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
