发明名称 |
Double tuned RF circuit with balanced secondary |
摘要 |
A band switchable double tuned circuit having a balanced secondary is presented. A primary tunable tank circuit with a plurality of first inductances is tuned to a first frequency by a first capacitor coupled in parallel with the first inductances. A secondary tank circuit with a plurality of second inductances inductively coupled to ones of the first inductances has a second capacitor coupled in parallel with the second inductances for tuning the secondary to the first frequency. The DC reference potential for the secondary circuit, is coupled to a nodal junction of the plurality of second inductances with the secondary tank circuit providing a balanced signal output. At least one of the plurality of first inductances and the second inductances are switchable for bandswitching the tuning of the primary and secondary tank circuits to a second frequency. The output signal from the balanced secondary is coupled to the input of a balanced mixer via constant bandwidth inductances without a mixer input balance transformer.
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申请公布号 |
US5619283(A) |
申请公布日期 |
1997.04.08 |
申请号 |
US19940287003 |
申请日期 |
1994.08.08 |
申请人 |
THOMSON CONSUMER ELECTRONICS, INC. |
发明人 |
PUGEL, MICHAEL A. |
分类号 |
H04N5/44;H03J3/28;H03J5/24;H04N5/50;(IPC1-7):H04N5/50 |
主分类号 |
H04N5/44 |
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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