公开(公告)号：US20060220757A1

公开(公告)日：2006-10-05

申请号：US11390452

申请日：2006-03-28

申请人： Kunito Satake ,  Hirotaka Oosawa ,  Isao Ikuta ,  Satoru Yamamoto

发明人： Kunito Satake ,  Hirotaka Oosawa ,  Isao Ikuta ,  Satoru Yamamoto

IPC分类号： H03B5/12

CPC分类号： H03L7/107 ,  H03B5/1215 ,  H03B5/1228 ,  H03B5/124 ,  H03B5/1265 ,  H03B2201/025 ,  H03J2200/10 ,  H03L7/07 ,  H03L7/099 ,  H03L7/183

摘要： A radio frequency IC includes a PLL circuit and prevents a PLL loop from being easily unlocked upon fluctuation of VCO oscillation frequencies due to a change in temperature. The PLL loop includes a VCO capable of switching oscillation frequency bands, a variable frequency divider, a phase comparison circuit, and a loop filter. A switching switch can apply one of plural predetermined set voltages to the VCO in place of a voltage of the loop filter in an open state in which the loop filter is disconnected from the VCO. The radio frequency IC als has a decision circuit that decides whether the phase of output of the variable frequency divider is ahead of or lags behind that of a reference signal of a predetermined frequency, and an automatic band switching circuit that generates a signal for switching VCO frequency bands, based on output of the decision circuit.

摘要翻译： 无线电频率IC包括PLL电路，并且防止由于温度变化导致VCO振荡频率波动时PLL环路容易解锁。 PLL环路包括能够切换振荡频带的VCO，可变分频器，相位比较电路和环路滤波器。 切换开关可以在环路滤波器与VCO断开的打开状态中将代替多个预定设定电压中的一个代替环路滤波器的电压。 射频IC als具有决定电路，判断可变分频器的输出的相位是否在预定频率的参考信号的前面，或者落后于预定频率的参考信号的输出相位，以及产生用于开关VCO的信号的自动频带切换电路 频段，基于判决电路的输出。