| 摘要 |
PURPOSE:To remarkably increase the rate of reception time, by receiving the local oscillation signal from others when each PLL circuit is unlocked, through taking notice of possibility of interference between input waves, in a system using two system of PLLs. CONSTITUTION:In a diversity reception system receiving the reception wave with PLL circuits >=2 systems, when a PLL is unlocked, if another is locked, the local oscillation signal of locked PLL is temporarily used to one PLL, allowing to reduce the relocking time. The control logic 100 in which the locking of each PLL is monitored and the analog switch S is driven when either one is unlocked, is provided, constituting the entire switch circuit. |
