发明名称 |
FM receiver including a phase-quadrature polyphase if filter |
摘要 |
An FM receiver having an RF section, a first tunable mixer stage for the frequency conversion of a desired RF FM reception signal into a first intermediate frequency signal, an IF device and an FM demodulator. In order to enhance the integration of the apparatus, while maintaining a signal processing ability which is free from distortion, the FM receiver includes circuitry incorporated in the signal path for converting a single-phase signal into a pair of signals in mutual phase quadrature. The pair of phase-quadrature signals is applied to in-phase and quadrature signal paths of the IF device. The IF device having a polyphase IF filter incorporated in the in-phase and quadrature signal paths and has a bandpass characteristic which is symmetrical around its resonance frequency. The polyphase IF filter is coupled to the FM demodulator.
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申请公布号 |
US5715529(A) |
申请公布日期 |
1998.02.03 |
申请号 |
US19930063384 |
申请日期 |
1993.05.18 |
申请人 |
U.S. PHILIPS CORPORATION |
发明人 |
KIANUSH, KAVEH;BIJKER, WOLTER;KASPERKOVITZ, WOLFDIETRICH G.;DE RUYTER, HENDRICUS C.;SLOOF, WILLEM A. |
分类号 |
H04B1/16;H03D3/00;H03J7/02;H04B1/26;(IPC1-7):H04B1/26 |
主分类号 |
H04B1/16 |
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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