发明名称 |
Electronic tuning circuit for an AM receiver |
摘要 |
An electronic tuning circuit for an AM radio receiver in which a signal of a specific frequency is selected from the input signal from an antenna is provided, this tuning circuit having a tuning transformer with a first winding and a second winding, the number of turns on the first winding being greater than the number of turns on said second winding, the input from the antenna being applied to the second winding of the tuning transformer, and further having two varactor diodes, each of which is connected in series with a DC-blocking capacitor, these series-connected varactor-capacitor combinations being connected in parallel with the first winding of the tuning transformer such that the polarities of the varactor diodes are mutually opposing.
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申请公布号 |
US5678212(A) |
申请公布日期 |
1997.10.14 |
申请号 |
US19950526092 |
申请日期 |
1995.09.11 |
申请人 |
TOKO KABUSHIKI KAISHA |
发明人 |
SAKAI, KOICHI;KASAHARA, KEN;YOKOYAMA, HAJIME;TAKADA, NOBORU;SUZUKI, YUKIO |
分类号 |
H03J3/32;H03J3/18;H03J3/20;H04B1/18;(IPC1-7):H04B1/18 |
主分类号 |
H03J3/32 |
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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