| 摘要 |
PURPOSE:To obtain a stable operation and realize power saving by selecting an impedance element which is almost equal to the input impedance of the PLL frequency synthesizer at burst timing at non-burst timing. CONSTITUTION:By the switch of the load changeover switch 240 connected with a PLL frequency synthesizer 224, a resistor 250 as a buffer amplifier 223 or an impedance element is selectively connected with the PLL frequency synthesizer 224. In this case, the changeover switch 240 performs a switch operation by the control command of a control part, connects the PLL frequency synthesizer 224 with a buffer amplifier 223 at the burst timing of a first slot to be used in transmission/reception of a period for transmission and a period for reception, for instance, and connects the synthesizer with the resistor 250 at the non-burst timing other than this. |
