发明名称 A H.F. RECEIVING STAGE
摘要 The output electrode of a field effect transistor of a high-frequency input stage is connected to a capacitively coupled input (gate) electrode of the field effect transistor of a mixer stage through one of a pair of bifilarly wound coils provided on a ferrite core, while the second of these coils connects the same input of the mixer stage to the output of a local oscillator in such a way that two signal paths leading towards the mixer stage, respectively for the high-frequency signal and the oscillator signal, go through coupled coils in opposite winding directions. The result is that the path for signals in either direction between the local oscillator and the input stage are of much higher impedance than the paths for signals proceeding to the mixer stage respectively from the input stage and from the local oscillator.
申请公布号 ZA8003058(B) 申请公布日期 1981.05.27
申请号 ZA19800003058 申请日期 1980.05.22
申请人 BLAUPUNKT WERKE G M B H 发明人 KATTHAN W
分类号 H03D7/00 主分类号 H03D7/00
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