| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To obviate an external circuit such as a signal path changeover switch when bidirectionally performing frequency conversion using one frequency converter. <P>SOLUTION: A base of a bipolar transistor 1 connected to an RF terminal 13, an IF terminal 9 and an LO terminal 6 is connected with a power source 16 via a power supply switch 11. When the power supply switch 11 is turned on and an RF signal and an LO signal are inputted to the bipolar transistor 1, a mixed signal of the both is outputted as an IF signal. When the power supply switch 11 is turned off, the bipolar transistor 1 is operated as two diodes connecting a base terminal 4 and an emitter terminal 2 and connecting the base terminal 4 and a collector terminal 3 and when the IF signal and the LO signal are inputted, they are mixed by the diodes and an RF signal is outputted. Thus, unidirectional frequency conversion has a plus conversion gain and the signal is inputted or outputted in each direction of frequency conversion in each of the terminals. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
