公开(公告)号：US07956778B2

公开(公告)日：2011-06-07

申请号：US12656490

申请日：2010-02-01

Applicant: Tetsuhiro Koyama

Inventor： Tetsuhiro Koyama

IPC: H03M1/66

CPC classification number: H03M1/201 ,  H03M1/20 ,  H03M1/60

Abstract: There is provided an analog-to-digital converter capable of performing analog-to-digital conversion with good accuracy. The analog-to-digital converter in accordance with the present invention includes a dither generation circuit 11 which generates dither; an input polarity switching unit 1 which switches a polarity of an input signal; an integrator 2; an integrator output regulator circuit 5 which regulates an output voltage of the integrator 2; a window comparator 3; a control circuit 4 which uses the comparison result of the window comparator 3 to control the input polarity switching unit 1, the integrator output regulator circuit 5, and the window comparator 3 as well as to generate a digital signal. The dither generation circuit 11 generates dither in such a manner that a cycle in which the digital signal is read is an integral multiple of a dither cycle. Further, the dither generation circuit 11 generates dither in such a manner that the number of times the count value is generated in the first half of one cycle of the dither is different from the number of times the count value is generated in the second half cycle thereof.

Abstract translation: 提供了能够以高精度执行模数转换的模数转换器。 根据本发明的模拟 - 数字转换器包括产生抖动的抖动产生电路11; 输入极性切换单元1，其切换输入信号的极性; 积分器2; 积分器输出调节器电路5，其调节积分器2的输出电压; 窗口比较器3; 使用窗口比较器3的比较结果来控制输入极性切换单元1，积分器输出调节器电路5和窗口比较器3以及生成数字信号的控制电路4。 抖动产生电路11产生抖动，使得读取数字信号的周期是抖动周期的整数倍。 此外，抖动发生电路11产生抖动，使得在抖动的一个周期的前半部分中产生计数值的次数与在第二个半周期中产生计数值的次数不同 其中。

公开(公告)号：US20080231485A1

公开(公告)日：2008-09-25

申请号：US11689377

申请日：2007-03-21

Applicant: Matthew P. Newlin ,  Lee K. Strandjord ,  Thomas C. Greening ,  Gregory W. Keith

Inventor： Matthew P. Newlin ,  Lee K. Strandjord ,  Thomas C. Greening ,  Gregory W. Keith

IPC: H03M1/20

CPC classification number: H03M1/0641 ,  G06F7/588 ,  H03M1/201 ,  H03M1/661

Abstract: Systems and methods for improving efficiency of a data converter. An example method generates a noise signal, alters the spectrum of the noise signal based on operation of an associated data converter, and supplies the altered spectrum noise signal to the associated data converter. The data converter is a digital-to-analog converter or an analog-to-digital converter. The altered spectrum noise signal is notched at frequencies of interest. The spectrum is altered by sending a signal generated by a random number generator to a delay device and adding the output of the delay device from the output of the random number generator. Also, the spectrum is altered by seeding first and second identical random number generators, delaying the operation of the first random number generator, and adding the output of the delayed first random number generator from the second random number generator.

Abstract translation: 提高数据转换器效率的系统和方法。 示例性方法产生噪声信号，基于相关联的数据转换器的操作改变噪声信号的频谱，并将改变的频谱噪声信号提供给相关联的数据转换器。 数据转换器是数模转换器或模数转换器。 改变的频谱噪声信号在感兴趣的频率处被切断。 通过将随机数发生器产生的信号发送到延迟装置并且从随机数发生器的输出添加延迟装置的输出来改变频谱。 此外，通过播种第一和第二相同的随机数发生器来改变频谱，延迟第一随机数发生器的操作，以及将来自第二随机数发生器的延迟的第一随机数发生器的输出相加。

公开(公告)号：US06331831B1

公开(公告)日：2001-12-18

申请号：US09684181

申请日：2000-10-07

Applicant: Zoran Cvetkovic ,  Ingrid Daubechies

Inventor： Zoran Cvetkovic ,  Ingrid Daubechies

IPC: H03M120

CPC classification number: H03M1/201

Abstract: A/D conversion is achieved by employing a piecewise continuous dither signal such that a signal that results from combining the dither signal with the signal to be converted, has a zero-crossing within each interval Ij=(jT,(j+1)T), where j is an integer, T=&pgr;/&lgr;B, B is the bandwidth of the signal to be converted, and &lgr; is a constant that is greater than 1, and those zero crossings in adjacent intervals Ij are always separated by some minimal distance, &egr;, for all intervals Ij. Zero crossings of the combined signal are detected, and the instances where those crossings occur are encoded; one zero crossing for each interval.

Abstract translation: 通过采用分段连续抖动信号来实现A / D转换，使得将抖动信号与要转换的信号组合的信号在每个间隔内具有零交叉Ij =（jT，（j + 1）T ），其中j是整数，T = pi / lambdB，B是要转换的信号的带宽，并且lambd是大于1的常数，并且相邻间隔Ij中的那些过零点总是被一些最小的 距离，epsi，对于所有间隔Ij。 检测到组合信号的零交叉，并且对这些交叉发生的情况进行编码; 每个间隔一个零交叉。

公开(公告)号：US5497154A

公开(公告)日：1996-03-05

申请号：US296132

申请日：1994-08-26

Applicant: Mitsuya Komamura

Inventor： Mitsuya Komamura

IPC: G11B20/10 ,  H03M1/06 ,  H03M1/12 ,  H03M1/20 ,  H03M1/08

CPC classification number: H03M1/0641 ,  H03M1/201 ,  H03M1/12

Abstract: A dither generating apparatus which generates a sufficiently random auto dither even for a small-level signal and even if the buffer length is short. The LSB of quantized data is extracted and is stored in a buffer memory which serves as an M-bit shift register. An index buffer storing old 2.sup.M indexes is referred to with the M bits. A look-up table, which outputs a random value, is referred to in accordance with the value in the index buffer and outputs a dither. After the reference to the look-up table, current M-bit data is input to the index buffer so that the content of the index buffer is shifted piece by piece. As the values of the outputs of the index buffer and the buffer memory are both always variable, different values are always supplied to the look-up table, which therefore generates sufficiently random dithers.

Abstract translation: 即使对于小电平信号也产生足够随机的自动抖动并且即使缓冲器长度短的抖动产生装置。 量化数据的LSB被提取并存储在用作M位移位寄存器的缓冲存储器中。 存储旧的2M索引的索引缓冲器被称为M位。 根据索引缓冲器中的值来引用输出随机值的查找表，并输出抖动。 在参考查找表之后，将当前的M位数据输入到索引缓冲器，使得索引缓冲器的内容逐个移位。 由于索引缓冲器和缓冲存储器的输出的值总是可变的，所以不断的值始终被提供给查找表，因此查找表产生足够的随机抖动。

公开(公告)号：US5493298A

公开(公告)日：1996-02-20

申请号：US356923

申请日：1994-12-14

Applicant: Manfred U. Bartz

Inventor： Manfred U. Bartz

IPC: H03M1/06 ,  H03M1/12 ,  H03M1/20

CPC classification number: H03M1/0641 ,  H03M1/201 ,  H03M1/12

Abstract: A dithered analog-to-digital converter includes a correlator to detect dither residue in the output signal. The correlator output is accumulated and used in a feedback loop to control the gain of the dither signal so as to null the residue. Problems associated with the low bandwidth of the feedback loop, and corruption of the accumulator value due to overload, are addressed by provision of a preload register from which the accumulator is initialized on power-up and on detection of an overload. This approach provides quick settling time and avoids statistical anomalies associated with decimation approaches to overload.

Abstract translation: 抖动模数转换器包括用于检测输出信号中的抖动残差的相关器。 相关器输出被积累并用在反馈环路中以控制抖动信号的增益，以使残余物无效。 通过提供预加载寄存器来解决与反馈环路的低带宽相关的问题以及由于过载而导致的累加器值的损坏，在预加载寄存器中，通过上电和检测到过载来初始化累加器。 这种方法提供了快速的建立时间，并避免了与抽取方法过载相关的统计异常。

公开(公告)号：US5134399A

公开(公告)日：1992-07-28

申请号：US593441

申请日：1990-10-05

Applicant: Donald R. Hiller

Inventor： Donald R. Hiller

IPC: H03M1/14 ,  H03M1/20

CPC classification number: H03M1/201 ,  H03M1/144

Abstract: Noise (dither) is introduced into a subranging analog-to-digital converter to enhance conversion accuracy. The resolution of the noise is sufficiently fine that its least significant bits can be changed without always changing the second pass approximation from the converter's internal analog-to-digital converter. Additional bits of statistical resolution can thereby be achieved without sacrificing the overlap between the dither word and the first pass digital approximation that is needed to provide dithered error correction.

Abstract translation: 将噪声（抖动）引入到子模块中，以提高转换精度。 噪声的分辨率足够精细，使得其最低有效位可以被改变而不必总是从转换器的内部模数转换器改变第二遍近似。 因此可以实现统计分辨率的附加位，而不会牺牲抖动字与提供抖动纠错所需的第一遍数字近似之间的重叠。

公开(公告)号：US5075678A

公开(公告)日：1991-12-24

申请号：US662403

申请日：1991-02-28

Applicant: Thomas Ohlsson ,  Bo Hjorth

Inventor： Thomas Ohlsson ,  Bo Hjorth

IPC: A61B5/0428 ,  A61B5/0476 ,  H03H17/02 ,  H03M1/12 ,  H03M1/18 ,  H03M1/20

CPC classification number: H03M1/183 ,  H03M1/201

Abstract: A method for analog-to-digital conversion includes the steps of applying a first transfer function to the input signal and amplifying the input signal by a defined gain factor to obtain an edited signal, subject chronologically successive samples of both the input signal and the edited signal to analog-to-digital conversion and thereby obtaining digital data having a defined number of bits corresponding to the input signal and digital data having a defined number of bits corresponding to the edited signal, multiplying the digital data corresponding to the input signal by a defined factor equal to the gain factor, applying a second transfer function to the digital data corresponding to the input signal by digital filtering, and undertaking calculations on the signals obtained in this manner to obtain a final analog-to-digital conversion result. An apparatus operating according to this method is also disclosed.

Abstract translation: 一种用于模数转换的方法包括以下步骤：将第一传递函数应用于输入信号，并通过定义的增益因子放大输入信号，以获得编辑信号，按时间顺序输入信号和编辑的信号样本 信号到模数转换，从而获得具有对应于输入信号的定义数量的位的数字数据和具有与编辑信号相对应的定义的位数的数字数据，将对应于输入信号的数字数据乘以一 定义的因子等于增益因子，通过数字滤波对与输入信号对应的数字数据应用第二传递函数，并对以这种方式获得的信号进行计算以获得最终的模数转换结果。 还公开了根据该方法操作的装置。

公开(公告)号：US4550309A

公开(公告)日：1985-10-29

申请号：US580584

申请日：1984-02-16

Applicant: Donald R. Hiller ,  Charles Kingsford-Smith

Inventor： Donald R. Hiller ,  Charles Kingsford-Smith

IPC: H03M1/14 ,  H03M1/00

CPC classification number: H03M1/201

Abstract: In a standard residue class analog-to-digital converter, pseudo-random noise is introduced at first or subsequent approximations of an analog input signal by the local digital-to-analog converter.

Abstract translation: 在标准残留类别的模拟 - 数字转换器中，通过本地数模转换器在模拟输入信号的第一个或其后续近似时引入伪随机噪声。

公开(公告)号：EP2913890A1

公开(公告)日：2015-09-02

申请号：EP15155180.1

申请日：2015-02-16

Applicant: Elta Systems Ltd.

Inventor： Fleishman, Baruch

IPC: H01Q3/26 ,  H03M1/06 ,  H03M1/20 ,  H04B7/08 ,  H03M3/00 ,  H04B1/00

CPC classification number: H03M1/201 ,  H04B1/0007 ,  H04B7/086

Abstract: A system and method for enhancing a dynamic range of a beamforming multichannel digital receiver are described. The receiver comprises a plurality of receiving channels, each including an analog-to-digital converter configured for converting an analog input signal generated by antenna elements into a digital signal. A "spatial" dither signal is used to decorrelate the quantization noise of the analog-to-digital converters. A dither signal is generated and split into a predetermined number of coherent dithering signals. The method includes providing predetermined time delays to the coherent dithering signals, and adding the delayed coherent dithering signals to the input signals in each receiving channel, correspondingly, thereby creating a dither signal equivalent to a signal arriving from a certain specific direction out-of-field-of-view of the antenna array. Removing of the dither signal based on the direction of arrival, is implemented during beamforming signal processing, thus enhancing the dynamic range of electromagnetic signals arriving within a field-of-view of the antenna array.

Abstract translation: 一种用于增强的波束形成多信道数字接收器的动态范围的系统和方法进行了描述。 该接收器包括：接收信道与多个，在每一个包括模拟数字转换器，用于将经配置以由天线元件生成成数字信号的模拟输入信号。 A“空间”抖动信号被用于去相关的模拟 - 数字转换器的量化噪声。 颤动信号被生成并分成相干抖动信号的预定数量。 该方法包括提供预定时间延迟到相干抖动信号，并且在每个接收信道将所述延迟相干抖动信号与输入信号，相应地，由此产生高频脉动信号等效的信号从特定方向到达的某些失 场的视图中的天线阵列的。 除去基于到达方向的抖动信号，波束形成的信号处理，从而提高了天线阵列的字段的视图内到达的电磁信号的动态范围内实现的。

公开(公告)号：EP2654208A3

公开(公告)日：2015-07-01

申请号：EP13002092.8

申请日：2013-04-22

Applicant: Linear Technology Corporation

Inventor： Steensgaard-Madsen, Jesper

IPC: H03M1/06 ,  H03M1/46

CPC classification number: H03M1/201 ,  H03M1/0641 ,  H03M1/0668 ,  H03M1/462 ,  H03M1/468

Abstract: An analog-to-digital converter (ADC) system and method. The ADC system in accord with one embodiment includes a sampling digital-to-analog converter configured to sample a combination of an analog signal value and an analog dither value, and a control circuit comprising a mismatch-shaping encoder. The control circuit is configured to sequentially apply a plurality of digital codes to the sampling digital-to-analog converter during an analog-to-digital conversion operation to derive a digital code representing the combination of the analog signal value and the analog dither value. Several embodiments are presented.