| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a radio circuit capable of stably transmitting data, an integrated circuit device and an electronic apparatus. <P>SOLUTION: The radio circuit 100 includes a transmission signal generating circuit 110, having a PLL circuit 120 having a voltage-controlled oscillator circuit for generating a transmission signal and outputting the signal, a power amplifier 130 for amplifying the transmission signal, and a frequency-measuring circuit 140. The PLL circuit 120 is set for a closed loop operation, during a period prior to a transmission data output period and for an open-loop operation during the transmission data output period. The frequency-measuring circuit 140 measures at least an amount of frequency shift of carrier frequency of a transmission signal, at switching from the closed-loop operation to the open-loop operation or an amount of frequency drift of carrier frequency during the period of transmission data output. <P>COPYRIGHT: (C)2011,JPO&INPIT |
