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公开(公告)号：EP1238468B1
公开(公告)日：2003-10-22
申请号：EP01960618.5
申请日：2001-08-03
CPC分类号： H04B1/24 , H04B10/6972
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公开(公告)号：EP1238468A1
公开(公告)日：2002-09-11
申请号：EP01960618.5
申请日：2001-08-03
CPC分类号： H04B1/24 , H04B10/6972
摘要： The invention relates to a method for noise rejection by means of a performance-adjustable bandpass filter in a receiver circuit, for carrier-modulated received signals Sin, whereby the bandpass-filtered received signal Bout is demodulated and the demodulated received signal Dout is used to start a switching process. Conventional receiver circuits, however, have the disadvantage that, due to the small dimensions of the circuit surface area, disturbances, for example, in the form of oscillator variations due to capacitive coupling, are caused as a result of switching processes in the output region of the receiver, in particular, due to power transistors. Said disturbances cannot be eliminated by an amplifier control provided in the circuit. According to the invention, said internal disturbances may be removed whereby a power reduction in the bandpass filter is correlated with the switching process which causes the disturbance. The above circuit is suitable above all for the construction of circuits for infra-red receivers, which can thus be produced small, without external components and hence economically.
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