发明授权
- 专利标题: Receiver and filter arrangement comprising polyphase filters
- 专利标题(中): 包括多相滤波器的接收器和滤波器装置
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申请号: US09050594申请日: 1998-03-30
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公开(公告)号: US06236847B1公开(公告)日: 2001-05-22
- 发明人: Eduard F. Stikvoort
- 申请人: Eduard F. Stikvoort
- 优先权: EP97201017 19970407
- 主分类号: H04B126
- IPC分类号: H04B126
摘要:
In a receiver the input signal is converted by a mixer into two quadrature IF signals. The quadrature IF signals are amplified by an amplifier and filtered by a filter. A polyphase filter suppresses signals having frequencies above a predetermined frequency. A second mixer converts the filtered IF signal into a second IF signal. This second IF signal is filtered by a second polyphase filter which suppresses signals having a frequency below a predetermined frequency. In this way a band-pass transfer function is obtained having a first edge defined by the first polyphase filter and having the second defined by the second polyphase filter. In an embodiment of the invention, the cut off frequencies of the polyphase filters are equal to zero, resulting in a transfer function for the complete receiver having cut off frequencies independent from the component values use in the polyphase filters.
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