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1.发明公开PROGRAMMABLE ANALOG BANDPASS FILTERING APPARATUS AND METHOD AND DESIGN METHOD FOR A DISCRETE TIME FILTER 失效可调模拟带通滤波设备关联，一时间，离散滤波器方法和设计方法
公开(公告)号：EP0958655A1
公开(公告)日：1999-11-24
申请号：EP98904455.0
申请日：1998-01-16
发明人： SIGNELL, Svante , SCHIER, Thorsten
IPC分类号： H03H17
CPC分类号： H03H17/02
摘要： A desired programmable complex analog bandpass filter (10) is replaced by a 'black box' that receives an analog continuous-time signal and delivers an analog continuous-time signal, just as the analog filter would, but internally realizes the programmability with a programmable discrete-time system. The transfer function of the 'black box' is the same as the transfer function of the analog filter. The 'black box' includes an anti-aliasing filter (12), an A/D-converter (14), a complex digital bandpass filter (16), a D/A-converter (18) and an anti-imaging filter (20).
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公开(公告)号：EP0920757B1
公开(公告)日：2005-04-06
申请号：EP97944237.3
申请日：1997-09-19
发明人： SIGNELL, Svante , SCHIER, Thorsten
CPC分类号： H04J1/05 , H03H17/0202 , H04L5/06
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公开(公告)号：EP1057253B1
公开(公告)日：2007-08-08
申请号：EP98946753.5
申请日：1998-09-28
发明人： SCHIER, Thorsten , SIGNELL, Svante
IPC分类号： H03D1/00
CPC分类号： H03D7/166 , H03D1/24 , H03D7/161 , H03D7/165 , H03D2200/0054 , H03D2200/0072
摘要： A down-converter converts an amplitude modulated high frequency signal into a low frequency or baseband signal. A first mixer (30, 32) mixes the high frequency signal into a composite signal having an in-phase component and a quadrature component. A complex bandpass filter (34) bandwith limits the composite signal into a bandwidth limited signal with an in-phase component and a quadrature component. A second mixer (36, 38) mixes the bandwidth limited signal into an intermediate signal with an in-phase component and a quadrature component, and an adder (40) adds one component of the intermediate signal to the other. A similar up-conventer performs the reverse process.
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