| 摘要 |
<p>PURPOSE: To suppress mutual interference between oscillation systems of a PLL circuit for transmission and a PLL circuit for reception and to reduce interfering to the oscillation system when a signal is amplified. CONSTITUTION: The PLL circuit 10 for transmission which outputs an oscillation signal Ha of frequency 1/n (n>=2) time as high as the sent signal Sa, a multiplying circuit 1 which multiplies the oscillation signal Ha by (n), and the PLL circuit 20 for reception which outputs a signal Src for reception processing are constituted on the same substrate. The sent signal Sa outputted from the multiplying circuit 1 is amplified by an external power amplifier PA and fed to an antenna. Consequently, the mutual interference between the oscillation systems can be suppressed, which is suitable to size reduction. Deterioration in phase noise characteristics due to interference and fluctuations can be prevented. Specially, this module is useful as a PLL circuit module used for a portable telephone set and a mobile object communication equipment.</p> |
