发明名称 |
Receiver circuit comprising two phase control loops |
摘要 |
An FM receiver for demodulating an RF carrier signal containing a pilot frequency signal is provided. The receiver includes first and second frequency control loops. The first frequency control loop selects the local oscillator signal frequency. The reference signal oscillator in the first frequency control loop forms a part of a second frequency control loop. The second frequency control loop locks the phase of the reference signal oscillator with a detected pilot signal. In this way, the tuning signal of the local oscillator is kept phase locked to the detected pilot signal. Additional provisions are provided for changing the divisor of the second phase lock loop such that the time for establishing phase lock is reduced.
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申请公布号 |
US4607393(A) |
申请公布日期 |
1986.08.19 |
申请号 |
US19840655963 |
申请日期 |
1984.09.28 |
申请人 |
U.S. PHILIPS CORPORATION |
发明人 |
NOLDE, WOLFGANG;JANSEN, WINFRIED |
分类号 |
H03L7/22;H03D1/22;H03J5/02;H03L7/23;H04B1/16;H04B1/26;H04H5/00;(IPC1-7):H04B1/26 |
主分类号 |
H03L7/22 |
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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