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1. 发明授权

US3912916A Electrical current frequency filter circuit having parallel filter branches 失效
标题翻译：具有并联滤波器分支的电流频率滤波电路
公开(公告)号：US3912916A
公开(公告)日：1975-10-14
申请号：US45589374
申请日：1974-03-28
申请人： SIEMENS AG
发明人： GRUN ARTUR , PAESSLER ERNST-ROBERT , SMUTNY KURT
IPC分类号： H03H19/00 , H03B1/04
CPC分类号： H03H19/002
摘要： A filter circuit which comprises first and second parallel coupled filter branches each including a first multiplier, an intermediate frequency filter, and a second multiplier, respectively, coupled in series. A signal generator generates two output signals which are linearly independent of each other at a frequency which is equal to that of an input signal which is to be passed by the filter branches, and has a pair of output terminals coupled to the first multipliers of the filter branches for transmitting these output signals thereto. An adder is coupled to the second multipliers of the filter branches and generates an output signal which forms the output signal of the filter circuit. An adjustable signal feedback means is coupled to the output of the adder and to the inputs of the first multipliers of the filter branches for adjusting the bandwidth of the filter circuit. In an alternative embodiment of the invention, two pairs of identical filter branches are series coupled to form the filter circuit, with the adder of the second pair of filter branches generating the output signal of the filter circuit and being coupled to the signal feedback means of the circuit.

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