公开(公告)号：US20080094268A1

公开(公告)日：2008-04-24

申请号：US11815980

申请日：2006-02-13

申请人： Marcel Pelgrom ,  Kathleen Philips ,  Petrus Antonius Nuijten ,  Raf Roovers ,  Lucien Breems

发明人： Marcel Pelgrom ,  Kathleen Philips ,  Petrus Antonius Nuijten ,  Raf Roovers ,  Lucien Breems

IPC分类号： H03M1/12

CPC分类号： H03M3/418

摘要： In an AD converter a primary ΣA-modulator digitizes the analog input signal. The quantization noise generated thereby is isolated in the analog domain and digitized in a secondary ΣA-modulator. The quantization noise so digitized by the secondary ΣA-modulator is subtracted from the quantization noise in the output of the primary ΣA-modulator. Because the quantization noise generated by the primary ΣA-modulator is subject to filtering (shaping) the quantization noise digitized in the secondary ΣA-modulator should also be filtered. This is performed by similar filtering in the feedback path of the secondary ΣA-modulator.

摘要翻译： 在AD转换器中，主SigmaA调制器将模拟输入信号数字化。 由此产生的量化噪声在模拟域中被隔离，并在次级ΣA调制器中数字化。 由主要SigmaA调制器的输出中的量化噪声减去由次级ΣA调制器数字化的量化噪声。 由于由主要ΣA调制器产生的量化噪声经过滤波（整形），所以二次ΣA调制器中数字化的量化噪声也应被滤波。 这通过在次级SigmaA调制器的反馈路径中的类似滤波来执行。

公开(公告)号：US20050068221A1

公开(公告)日：2005-03-31

申请号：US10950760

申请日：2004-09-27

申请人： Steven Freeman ,  Gary Schwartz ,  Raf Roovers ,  Lucien Breems ,  George Brock-Fisher ,  Theodore Fazioli

发明人： Steven Freeman ,  Gary Schwartz ,  Raf Roovers ,  Lucien Breems ,  George Brock-Fisher ,  Theodore Fazioli

IPC分类号： A61B8/00 ,  G01S7/52 ,  G01S15/89 ,  H03M3/02 ,  H03M3/04 ,  H03M1/38

CPC分类号： G01S7/52028 ,  G01S7/52095 ,  G01S15/8979 ,  H03M3/43 ,  H03M3/46

摘要： A receive beamformer, and ultrasound system incorporating such a receive beamformer, is constructed to implement multi-bit analog to digital conversion in such a way that the need for gain control in the channel architecture preceding the digital conversion circuitry is obviated. Accordingly, the beamformer and any ultrasound system incorporating it may realize a rigorous level of ADC performance at desirable output rates, and a lower cost. Preferably, the invention construction realizes a level of performance by which CW Doppler may be digitized in the same manner as very wide-band pulsed-wave signals.

公开(公告)号：US20060203936A1

公开(公告)日：2006-09-14

申请号：US10552816

申请日：2004-04-13

申请人： Raf Roovers ,  Harish Kundur Subramaniyan ,  Gerard Van Der Weide

发明人： Raf Roovers ,  Harish Kundur Subramaniyan ,  Gerard Van Der Weide

IPC分类号： H04L25/06

CPC分类号： H04L25/4902 ,  H04B1/71637 ,  H04L27/0004 ,  H04L27/0012

摘要： Pulses are detected in a communications receiver by programming each of a plurality of comparators (44a, 44b, . . . , 44n) with a sampling time point selected from a plurality of sampling time points (58, 60) and with a reference level selected from a plurality of reference levels (54, 56). The received signal is applied to each of the comparators such that each of the comparators produces a respective output signal based on a comparison between the received signal level and the selected reference level at the selected sampling time point. The combinations of sampling time points and reference levels can be selected based on knowledge about the expected arrival times of the pulses, and based on knowledge about the possible shapes of said pulses, with the result that the device can detect received pulses without requiring large amounts of hardware, in a device which has an acceptable power consumption. The communications system may be a signaling system, or a radar or positioning system.

摘要翻译： 在通信接收器中通过用从多个采样时间点（58,60）中选择的采样时间点对多个比较器（44a，44b，...，44n）中的每一个进行编程来检测脉冲，并且 参考电平从多个参考电平（54,56）中选择。 接收的信号被施加到每个比较器，使得每个比较器基于在所选择的采样时间点处的接收信号电平和所选择的参考电平之间的比较来产生相应的输出信号。 可以基于关于脉冲的预期到达时间的知识并且基于关于所述脉冲的可能形状的知识来选择采样时间点和参考电平的组合，结果是设备可以检测接收到的脉冲而不需要大量 的硬件，在具有可接受的功耗的设备中。 通信系统可以是信令系统，或雷达或定位系统。

公开(公告)号：US20070202829A1

公开(公告)日：2007-08-30

申请号：US11568270

申请日：2005-04-25

申请人： Raf Roovers ,  Gerard Van Der Weide ,  Harish Kundur Subramaniyan

发明人： Raf Roovers ,  Gerard Van Der Weide ,  Harish Kundur Subramaniyan

IPC分类号： H04B1/10

CPC分类号： H04B1/1036 ,  H04B1/71637 ,  H04B1/719

摘要： A receiver is suitable for use in a wireless communications system, which is subject to interference from interfering signals having much narrower bandwidths than the wanted signal. In the receiver, an interfering signal is detected in the frequency domain and moreover, the cancellation also takes place in the frequency domain. Detection and cancellation in the frequency domain also provides a way of estimating the magnitude of the interfering signal, and hence also allows the wanted signal, at the frequency of the interfering signal, to be estimated.

摘要翻译： 接收机适用于无线通信系统，该无线通信系统受到干扰信号的干扰，该干扰信号具有比所需信号窄得多的带宽。 在接收机中，在频域中检测到干扰信号，此外，消除也发生在频域中。 在频域中的检测和消除还提供了一种估计干扰信号幅度的方法，因此也可以在干扰信号的频率处估计有用信号。