发明名称 |
Radio communication apparatus free from interference between local signal and transmission signal |
摘要 |
A radio communication apparatus capable of carrying out transmission and reception of signals at a time has a frequency synthesizer and a frequency modulator both in novel structures for removing interference between a local signal and a transmission signal. The frequency synthesizer has a local oscillator controlled by a first phase comparator for phase-comparing a frequency divided output of the local oscillator and a reference frequency signal to provide a local signal. The frequency division of the output of the local oscillator is effectd by a first frequency divider for dividing the frequency of the output of the local oscillator and a variable division ratio frequency divider for dividing the frequency of the output of the first frequency divider. The frequency modulator has a transmission oscillator controlled by a second phase comparator for phase-comparing the output of the first frequency divider and a frequency divided output of the transmission oscillator to provide a transmission signal. The frequency division of the output of the transmission oscillator is effected by a second frequency divider.
|
申请公布号 |
US4864634(A) |
申请公布日期 |
1989.09.05 |
申请号 |
US19880268253 |
申请日期 |
1988.11.07 |
申请人 |
HITACHI, LTD. |
发明人 |
NAKAGAWA, JUNICHI;KUWAMOTO, YOSHITOMO |
分类号 |
H03L7/193;H04B1/50;H04B1/52 |
主分类号 |
H03L7/193 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|