| 摘要 |
PROBLEM TO BE SOLVED: To reduce effects of a decrease in output impedance of a current-output-type PDIC at a high frequency and parasitic components according to a signal line, etc., upon characteristics of a signal having been transmitted at a high frequency. SOLUTION: A PDIC 363 is configured so that a plurality of resistors 620, 621,... 62n are disposed in the PDIC; the resistors are connected to the switching circuits 610, 611,...61n, respectively, the conductive/nonconductive states of which are controlled by output resistance setting signals 72 , and the conductive/nonconductive states of the switching circuits are controlled from outside of the PDIC 363 using the output resistance setting signals 72. In this configuration, the switching circuits controls the resistors respectively so as to enable/disable connection of the resistors to the output part, and also the output resistance of the PDIC 363 is set by these resistors so as to be approximately equal to the characteristic impedance of the signal line. COPYRIGHT: (C)2007,JPO&INPIT
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