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1. 发明申请

WO9827655A3 Pipeline analog-to-digital conversion 审中-公开
标题翻译：管道模拟 - 数字转换
公开(公告)号：WO9827655A3
公开(公告)日：1998-08-06
申请号：PCT/SE9702037
申请日：1997-12-05
申请人： ERICSSON TELEFON AB L M
发明人： SIGNELL SVANTE , JONSSON BENGT ERIK , STENSTROEM HELGE , TAN NIANXIONG
IPC分类号： H03M1/06 , H03M1/44 , H03M1/66 , H03M1/72
CPC分类号： H03M1/0687 , H03M1/0682 , H03M1/442 , H03M1/72
摘要： Pipeline A/D-conversion of an analog input signal is performed according to a new and inventive algorithm which generates a Gray coded digital output signal. A pipeline A/D-converter comprises a number of cascaded stages through which the analog input signal is propagated. Each stage generally generates an output bit of the digital output signal, and furthermore processes the pipeline signal. According to the inventive Gray coding algorithm, the output bit generated in a stage determines whether or not the pipeline signal of that stage is inverted. In a pipeling A/D-converter based on the Gray coding algorithm according to the invention, the accumulation of offset errors will generally be very low. Furthermore, the fact that the signal inversion is digitally controlled enables high precision implementations which further improve the performance of the inventive pipeline A/D-converter. In another embodiment of the invention, the Gray coding algorithm is modified to form a second algorithm which makes low device count implementations possible.

2. 发明申请

WO9900899B1 COMPLEX SWITCHED CAPACITOR FILTER AND DESIGNING METHOD FOR SUCH A FILTER 审中-公开
标题翻译：复合开关电容滤波器及其设计方法
公开(公告)号：WO9900899B1
公开(公告)日：1999-04-15
申请号：PCT/SE9801263
申请日：1998-06-26
申请人： ERICSSON TELEFON AB L M
发明人： SCHIER THORSTEN , SIGNELL SVANTE
IPC分类号： H03H19/00
CPC分类号： H03H19/004
摘要： A complex switched capacitor filter is formed by selecting (S3) an analog baseband prototype filter with the desired filter characteristics (S2). This prototype is converted (S4) into a corresponding real switched capacitor filter, and finally the real switched capacitor filter is converted (S5) into a complex switched capacitor filter by replacing each element of real filter by a frequency shifted complex counterpart.
摘要翻译：通过选择（S3）具有所需滤波器特性的模拟基带原型滤波器（S2）形成复杂的开关电容滤波器。该原型被转换（S4）为相应的实际开关电容滤波器，并且最终通过用实际滤波器的每个元件替换频移的复数对应来将实际开关电容滤波器转换（S5）为复合开关电容滤波器。

3. 发明申请

WO9918657A3 DOWN/UP-CONVERSION APPARATUS AND METHOD 审中-公开
标题翻译：向下/向上转换装置和方法
公开(公告)号：WO9918657A3
公开(公告)日：1999-06-24
申请号：PCT/SE9801726
申请日：1998-09-28
申请人： ERICSSON TELEFON AB L M
发明人： SCHIER THORSTEN , SIGNELL SVANTE
IPC分类号： H03M1/12 , H03D1/24 , H03D7/16 , H04L27/06
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.
摘要翻译：下变频器将幅度调制的高频信号转换为低频或基带信号。第一混频器（30,32）将高频信号混合成具有同相分量和正交分量的复合信号。复带通滤波器（34）将复合信号限制为具有同相分量和正交分量的带宽限制信号。第二混频器（36,38）将带宽限制信号混合成具有同相分量和正交分量的中间信号，并且加法器（40）将中间信号的一个分量加到另一个中。一个类似的up-conventer执行相反的过程。

4. 发明申请

WO9827656A3 DIGITAL-TO-ANALOG CONVERSION 审中-公开
标题翻译：数字到模拟转换
公开(公告)号：WO9827656A3
公开(公告)日：1998-08-06
申请号：PCT/SE9702039
申请日：1997-12-05
申请人： ERICSSON TELEFON AB L M
发明人： SIGNELL SVANTE , TAN NIANXIONG
IPC分类号： H03M1/06 , H03M1/10 , H03M1/40 , H03M1/66 , H03M1/72
CPC分类号： H03M1/667 , H03M1/0682 , H03M1/403 , H03M1/72
摘要： D/A-conversion of a Gray coded digital input signal is performed according to an inventive recursive Gray code-to-analog conversion algorithm. According to the recursive algorithm, the Gray code bits of the digital input are successively applied in the recursions of the algorithm, one Gray code bit for each recursion, and the analog output signal is generated by recursively updating an intermediate signal. In each recursion, the intermediate signal is selectively inverted in dependence on the particular Gray code bit that is applied in the recursion. The selective inversion of the intermediate signal is an inherent property of the Gray code-to-analog algorithm, and it is a key factor to reduce the accumulation of errors in a D/A-conversion. In a D/A-converter architecture based on the algorithm, the accumulation of offset errors will be low. Furthermore, the fact that the signal inversion is digitally controlled enables high precision implementations, further improving the performance of the D/A-converter. 00000
摘要翻译：灰度编码数字输入信号的D / A转换根据本发明的递归格雷码模转换算法进行。根据递归算法，数字输入的格雷码位在算法的递归中连续应用，每次递归一个格雷码位，并通过递归更新中间信号产生模拟输出信号。在每个递归中，中间信号根据递归中应用的特定格雷码位选择性反转。中间信号的选择性反转是格雷码模拟算法的固有特性，它是降低D / A转换中误差累积的关键因素。在基于该算法的D / A转换器架构中，偏移误差的积累将很低。此外，信号反转被数字控制的事实能够实现高精度实现，进一步提高D / A转换器的性能。 00000

5. 发明申请

WO9900899A3 COMPLEX SWITCHED CAPACITOR FILTER AND DESIGNING METHOD FOR SUCH A FILTER 审中-公开
标题翻译：复合开关电容滤波器和这种滤波器的设计方法
公开(公告)号：WO9900899A3
公开(公告)日：1999-03-18
申请号：PCT/SE9801263
申请日：1998-06-26
申请人： ERICSSON TELEFON AB L M
发明人： SCHIER THORSTEN , SIGNELL SVANTE
IPC分类号： H03H19/00
CPC分类号： H03H19/004
摘要： A complex switched capacitor filter is formed by selecting (S3) an analog baseband prototype filter with the desired filter characteristics (S2). This prototype is converted (S4) into a corresponding real switched capacitor filter, and finally the real switched capacitor filter is converted (S5) into a complex switched capacitor filter by replacing each element of real filter by a frequency shifted complex counterpart.

6. 发明申请

WO9815083A3 Signal transformation method and apparatus 审中-公开
标题翻译：信号变换方法及装置
公开(公告)号：WO9815083A3
公开(公告)日：1998-07-16
申请号：PCT/SE9701585
申请日：1997-09-19
申请人： ERICSSON TELEFON AB L M
发明人： SIGNELL SVANTE , SCHIER THORSTEN
IPC分类号： H04L27/22 , H03H17/02 , H04J1/05 , H04L5/06
CPC分类号： H04J1/05 , H03H17/0202 , H04L5/06
摘要： A base station in a radio communication system uses complex bandpass filters (Φ1, Φ2, ..., ΦN) and down-sampling to channelize a wideband signal containing many channels or channel groups.

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