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1. 发明申请

WO1994023494A1 DOUBLE SAMPLED BIQUAD SWITCHED CAPACITOR FILTER 审中-公开
标题翻译：双重采样生物量开关电容滤波器
公开(公告)号：WO1994023494A1
公开(公告)日：1994-10-13
申请号：PCT/US1994003785
申请日：1994-04-06
申请人： ANALOG DEVICES, INC.
发明人： ANALOG DEVICES, INC. , KWAN, Tom, W. , FERGUSON, Paul, F., Jr. , LEE, Wai, L.
IPC分类号： H03H19/00
CPC分类号： H03H19/004
摘要： A biquad switched capacitor filter is preferably utilized as the output filter in a sigma delta digital-to-analog converter. The switched capacitor filter uses a cross-coupled switched capacitor circuit which delivers charge to the capacitors on both phases of the clock. As a result, the sizes of the capacitors can be reduced by a factor of two, while delivering the same charge as a single sampling circuit. By using the cross-coupled switching circuit everywhere in the filter, the sensitivity to capacitor mismatches is substantially reduced. The clock phases applied to the stages of the filter are alternated so that there is a one clock cycle delay around each loop containing two filter stages, thereby insuring the stability of the filter.
摘要翻译：双倍开关电容滤波器优选地用作Σ-Δ数模转换器中的输出滤波器。开关电容滤波器使用交叉耦合开关电容器电路，其在时钟的两相上向电容器递送电荷。结果，电容器的尺寸可以减少2倍，同时提供与单个采样电路相同的电荷。通过在滤波器中的任何地方使用交叉耦合开关电路，电容器失配的灵敏度大大降低。施加到滤波器的级的时钟相位交替，使得在包含两个滤波器级的每个回路周围有一个时钟周期延迟，从而确保滤波器的稳定性。

2. 发明申请

WO1996037963A1 DATA ACQUISTION SYSTEM 审中-公开
标题翻译：数据采集系统
公开(公告)号：WO1996037963A1
公开(公告)日：1996-11-28
申请号：PCT/US1996007474
申请日：1996-05-23
申请人： ANALOG DEVICES, INC.
发明人： ANALOG DEVICES, INC. , LEE, Wai, L.
IPC分类号： H03M03/02
CPC分类号： H03H17/0289 , H03H17/0628 , H03M3/364 , H03M3/43 , H03M3/452 , H03M3/462
摘要： A computed tomography imaging method that includes receiving an analog beam intensity signal from a computed tomography scanner and converting it into a series of digital representations at successive points in time. An indication that a portion of the scanner has reached a certain position relative to the beam is received asynchronously with respect to these points in time, and the value of at least one of the digital representations is adjusted in response to the indication to obtain a corrected digital representation of the analog signal. A computed tomography imaging method that includes sigma-delta modulating an analog beam intensity signal to obtain a modulated version of the signal, and decimating it according to a rectangular time domain response with rounded rising and falling ends, which can be axially symmetrical. The method can also include another step of decimating that lasts a different amount of time, and/or another step of decimating that overlaps the step of decimating. A method of analog-to-digital conversion that can be used in computed tomography imaging, including actively deriving a first voltage from an analog current signal, dividing the first voltage into a second voltage, and converting the second voltage into a digital output.
摘要翻译：一种计算机断层摄影成像方法，包括从计算机断层摄影扫描仪接收模拟束强度信号，并在连续的时间点将其转换为一系列数字表示。相对于这些时间点，扫描仪的一部分已经达到相对于光束的某个位置的指示被异步地接收，并且响应于指示来调整数字表示中的至少一个的值以获得校正的模拟信号的数字表示。一种计算机断层成像方法，其包括Σ-Δ调制模拟束强度信号以获得所述信号的调制版本，并且根据具有四舍五入的上升和下降端的矩形时域响应对其进行抽取，其可以是轴对称的。该方法还可以包括另一步骤，其抽取持续不同的时间量，和/或抽取与抽取步骤重叠的另一步骤。一种可用于计算机断层成像的模数转换方法，包括主动地从模拟电流信号导出第一电压，将第一电压分为第二电压，以及将第二电压转换为数字输出。

3. 发明申请

WO1996037951A1 SWITCHED CAPACITOR OFFSET SUPPRESSION 审中-公开
标题翻译：开关电容器偏移抑制
公开(公告)号：WO1996037951A1
公开(公告)日：1996-11-28
申请号：PCT/US1996007580
申请日：1996-05-23
申请人： ANALOG DEVICES, INC.
发明人： ANALOG DEVICES, INC. , LEE, Wai, L.
IPC分类号： H03F03/00
CPC分类号： G11C27/026 , H03F1/303 , H03F3/005 , H03F3/45968 , H03F2200/81
摘要： A switched-capacitor circuit that includes a first signal path disposed between a first input node and a first output node, and a second signal path disposed between a second input node and a second output node. The first and second switches can be alternately disposed within the first and second signal paths. An amplifier responsive to the switches can be provided, and its offset can be cancelled. The outputs of the amplifiers can be maintained, and this can involve buffering.
摘要翻译：一种开关电容器电路，包括设置在第一输入节点和第一输出节点之间的第一信号路径，以及设置在第二输入节点和第二输出节点之间的第二信号路径。第一和第二开关可以交替地布置在第一和第二信号路径内。可以提供响应于开关的放大器，并且其偏移可以被取消。可以保持放大器的输出，并且这可以涉及缓冲。

4. 发明申请

WO1996037953A1 MULTI-RATE IIR DECIMATION AND INTERPOLATION FILTERS 审中-公开
标题翻译：多速率IIR分解和插值滤波器
公开(公告)号：WO1996037953A1
公开(公告)日：1996-11-28
申请号：PCT/US1996007579
申请日：1996-05-23
申请人： ANALOG DEVICES, INC.
发明人： ANALOG DEVICES, INC. , LEE, Wai, L. , KWAN, Tom, W.
IPC分类号： H03H17/04
CPC分类号： H03H17/0444 , H03H17/045 , H03H19/004
摘要： A digital filtering method that includes sampling an input signal at a first rate, integrating the signal, sampling the integrated version at a different rate, and combining the sampled integrated version with the input signal. The method can include again integrating the integrated version, sampling the twice integrated version at a third rate different from the first and second rates, and combining the twice integrated version with the integrated version and the input signal. The integrated version can be again integrated, the twice integrated version can be sampled at a third rate different from the first and second rates, and the twice integrated version can be combined with the integrated version. A common circuit component can be multiplexed to participate in two integrating steps.
摘要翻译：一种数字滤波方法，其包括以第一速率对输入信号进行采样，对信号进行积分，以不同速率对集成版本进行采样，以及将采样的集成版本与输入信号进行组合。该方法可以包括再次集成集成版本，以与第一和第二速率不同的第三速率对两次集成版本进行采样，并将两次集成版本与集成版本和输入信号组合。集成版本可以再次集成，可以以与第一和第二速率不同的第三速率对两次集成版本进行采样，并且两次集成版本可以与集成版本组合。公共电路组件可以被多路复用以参与两个集成步骤。

5. 发明申请

WO1996031944A1 IN-PHASE AND QUADRATURE SAMPLING CIRCUIT 审中-公开
标题翻译：相间和正交采样电路
公开(公告)号：WO1996031944A1
公开(公告)日：1996-10-10
申请号：PCT/US1996004685
申请日：1996-04-05
申请人： ANALOG DEVICES, INC.
发明人： ANALOG DEVICES, INC. , LEE, Wai, L. , GRANT, Norman, D. , FERGUSON, Paul, F., Jr.
IPC分类号： H03D07/16
CPC分类号： H03D7/165
摘要： A circuit that provides samples of in-phase and quadrature componenents of an input waveform includes an oversampling sigma-delta ADC that receives the input waveform and converts the input waveform to digital samples at an oversampling rate. A first digital filter, coupled to the ADC, receives the digital samples from the ADC and provides the in-phase component samples of the input waveform. A second digital filter, coupled to the ADC, receives the digital samples from the ADC and provides the quadrature component samples of the input waveform.
摘要翻译：提供输入波形的同相和正交分量样本的电路包括过采样Σ-ΔADC，其接收输入波形，并以过采样速率将输入波形转换为数字采样。耦合到ADC的第一个数字滤波器从ADC接收数字采样，并提供输入波形的同相分量采样。耦合到ADC的第二个数字滤波器从ADC接收数字采样，并提供输入波形的正交分量采样。

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