公开(公告)号：US06240147B1

公开(公告)日：2001-05-29

申请号：US09097290

申请日：1998-06-12

申请人： Yoshihito Muramatsu ,  Tadashi Oga

发明人： Yoshihito Muramatsu ,  Tadashi Oga

IPC分类号： H04L2706

CPC分类号： H04L27/2272 ,  H04L2027/003 ,  H04L2027/0055 ,  H04L2027/0065 ,  H04L2027/0073

摘要： An auto frequency control apparatus arranged to vary the division ratio of the comparison signal portion in the phase comparator with the AFC control voltage so as to change the frequency in order to make coincide the frequency of the output signal from a local oscillation portion and that of a carrier-wave signal for a frequency-shift keying signal with each other. The frequency of an output signal from a reference-signal generating portion is divided by a divider 213. The frequency of the output signal from a local oscillation portion is supplied to an auto frequency control 202. A control-signal processing portion 207 receives AFC control voltage to instruct an updown counter 205 to correct the division to correspond to the voltage. In accordance with the instruction, a counter 203 divides the supplied signal, the signal being multiplied with an integer in a multiplier 204 so as to be transmitted. The output signal is divided with a division ratio set by a divider 209. A phase comparator 214 detects the phase difference between the two output signals from the dividers 209 and 213 so as to transmit the phase difference to a voltage control oscillator provided for the local oscillation portion through a charge pump 215. Thus, the frequency of the local oscillation portion is varied.

摘要翻译： 一种自动频率控制装置，被配置为改变相位比较器中的比较信号部分与AFC控制电压的分频比，以便改变频率，以使来自本地振荡部分的输出信号的频率与 用于频移键控信号的载波信号。 来自参考信号产生部分的输出信号的频率由分频器213分频。来自本地振荡部分的输出信号的频率被提供给自动频率控制202.控制信号处理部分207接收AFC控制 电压以指示升降计数器205将该分频校正为对应于该电压。 根据该指令，计数器203将所提供的信号进行分频，该信号在乘法器204中被乘以整数，以便被发送。 输出信号由分频器209设定的分频比进行分频。相位比较器214检测来自分频器209和213的两个输出信号之间的相位差，以将相位差发送到为本地设置的电压控制振荡器 振荡部分通过电荷泵215.因此，本地振荡部分的频率是变化的。