发明名称 |
AM/FM RADIO RECEIVER AND LOCAL OSCILLATOR CIRCUIT USED THEREIN |
摘要 |
<p>A couple of frequency doubler circuits 21 and 22 which multiplys a frequency of a reference oscillation signal outputted from a reference oscillator 12 is provided, thereby a frequency of a reference oscillation signal, as the greatest common divisor between a frequency (300 KHz) determined by multiplying the frequency (fx=75 KHz) of a crystal oscillator 11 by four and a frequency (54 KHz) determined by multiplying an assigned frequency per one channel in AM radio broadcasting by a prescribed divide ratio, can be higher than a conventional frequency. This way realizes the decrease of a divide ratio in a programmable counter 17, resulting in the reduction of the circuit scale, shortening of the lock-up time, and improvement of the S/N ratio.</p> |
申请公布号 |
EP1689083(A1) |
申请公布日期 |
2006.08.09 |
申请号 |
EP20040747703 |
申请日期 |
2004.07.12 |
申请人 |
NIIGATA SEIMITSU CO., LTD. |
发明人 |
IKEDA, TAKESHI;MIYAGI, HIROSHI |
分类号 |
H03L7/18;H03J5/02;H03J5/24;H03L7/07;H03L7/181;H04B1/26 |
主分类号 |
H03L7/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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