发明名称 |
Four-terminal filter with shunt arm - uses shunt arm with quartz resonator in parallel with coil and in series with series resonant circuit |
摘要 |
<p>The shunt arm consists of at least one oscillating quartz crystal in parallel with a coil, so that at least two parallel resonant frequencies appear in this arm in addition of a series resonant frequency producing an attenuation peak. One of these parallel resonant frequencies (repetition frequency) lies in the filter stop band. A first quadripole is connected in parallel with the shunt arm before it, and a second quadripole follows it. A series resonant circuit in a shunt arm, or a parallel resonant circuit in the series arm precedes the first quadripole, while a similar circuit follows the second quadripole. Resonant frequency of these resonant circuits is at least approx. equal to the repetition frequency. A series resonant circuit consisting of a capacitor (Cz) and a coil (Ls) is in series with the shunt arm (Q', Cp', Lp').</p> |
申请公布号 |
DE2714133(A1) |
申请公布日期 |
1978.10.05 |
申请号 |
DE19772714133 |
申请日期 |
1977.03.30 |
申请人 |
SIEMENS AG |
发明人 |
SCHLICHT,RUDOLF,DIPL.-ING.;GOETZ,GERHARD,DIPL.-ING. |
分类号 |
H03H9/54;(IPC1-7):H03H9/00;H03H7/04 |
主分类号 |
H03H9/54 |
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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