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    • 2. 发明申请
    • Delay Cell and Digitally Controlled Oscillator
    • 延迟单元和数字控制振荡器
    • US20130038369A1
    • 2013-02-14
    • US13352350
    • 2012-01-18
    • Chen-Yi LEEChien-Ying YUChia-Jung YU
    • Chen-Yi LEEChien-Ying YUChia-Jung YU
    • H03K5/06
    • H03L7/0997
    • A delay cell includes a first inverted transistor pair, a second inverted transistor pair and a plurality of delay units. The first inverted transistor pair is used to receive an input signal. The second inverted transistor pair is electrically cross-coupled to the first inverted transistor pair and cross-controlled by the first inverted transistor pair. The delay units are cascaded between the first inverted transistor pair and between the second inverted transistor pair, thereby providing a plurality of signal propagation delays sequentially, wherein the input signal is delayed for a pre-determined time by the first inverted transistor pair, the second inverted transistor pair and the delay units which are operated sequentially, thereby creating an output signal corresponding to the pre-determined time. A digitally controlled oscillator including the aforementioned delay cells is provided.
    • 延迟单元包括第一反相晶体管对,第二反相晶体管对和多个延迟单元。 第一反相晶体管对用于接收输入信号。 第二反相晶体管对与第一反相晶体管对电交叉耦合并由第一反相晶体管对交叉控制。 延迟单元在第一反相晶体管对之间和第二反向晶体管对之间级联,从而依次提供多个信号传播延迟,其中输入信号被第一反相晶体管对延迟预定时间,第二 反相晶体管对和延迟单元,从而产生与预定时间对应的输出信号。 提供了包括上述延迟单元的数字控制振荡器。
    • 6. 发明申请
    • Fast fourier transform processor, dynamic scaling method and fast Fourier transform with radix-8 algorithm
    • 快速傅里叶变换处理器,动态缩放方法和基数8算法的快速傅里叶变换
    • US20050289207A1
    • 2005-12-29
    • US11052876
    • 2005-02-09
    • Chen-Yi LeeYu-Wei Lin
    • Chen-Yi LeeYu-Wei Lin
    • G06F15/00G06F17/14
    • G06F17/142
    • The present invention provides a fast Fourier transform processor, dynamic scaling method and fast Fourier transform with radix-8 algorithm. It reduces quantization errors generated from the operation by using a matrix prefetch buffer-based fast Fourier transform processor. Operation sizes of the matrix prefetch buffer as block sizes the invention adjust the signals against overflow by the status of signals in each block. It can shunt time of complex multiplication operation systematically and reduce operation complexity in butterfly units by utilizing algorithms of 3-step radix-8 fast Fourier transform and re-scheduling. Moreover, the present invention provides a fast Fourier transform processor for realizing the methods and algorithms mentioned above.
    • 本发明提供了一种快速傅里叶变换处理器,动态缩放方法和使用radix-8算法的快速傅立叶变换。 它通过使用基于矩阵预取缓冲器的快速傅里叶变换处理器来减少从操作产生的量化误差。 作为块大小的矩阵预取缓冲器的操作大小本发明通过每个块中的信号的状态来调整信号与溢出。 可以通过三步法-8快速傅立叶变换和重新调度的算法系统地分流复数乘法运算时间,降低蝴蝶单元的运算复杂度。 此外,本发明提供一种用于实现上述方法和算法的快速傅里叶变换处理器。
    • 7. 发明授权
    • Method and device for digitally synthesizing frequency
    • 数字合成频率的方法和装置
    • US6150892A
    • 2000-11-21
    • US182236
    • 1998-10-30
    • Chen-Yi LeeTerng-Yin HsuBai-Jue ShiehChung Cheng Wang
    • Chen-Yi LeeTerng-Yin HsuBai-Jue ShiehChung Cheng Wang
    • H03L7/085H03L7/095H03L7/099H03L7/18H03L7/00
    • H03L7/0805H03L7/085H03L7/0997H03L7/18H03L2207/50H03L7/095
    • A method and device for frequency synthesizing, in which the digital frequency synthesizer includes a clock pair having two similar ring-oscillators to separately generate a search frequency and an output frequency, a frequency tracking unit, and a clock controlling unit. The frequency-search method includes two stages: one stage is the coarse search stage based on the "Prune-and-Search", and other stage is the fine search stage based on the "fixed-step" algorithm. In order to determine which search scheme is used to search the target frequency and to determine the lock status, two cost functions for search and lock-in are derived. These two cost functions define the search threshold and the lock threshold, and these thresholds define the cost window and the lock window. If the frequency error is higher than both the search and lock thresholds, a coarse search is activated to estimate the correct frequency. And only when the frequency error falls between the search and the lock thresholds, should the fine search be activated. By properly assigning these two thresholds, the search performance, such as tinting and frequency error, and the output resolution can be improved. The digital frequency synthesizer which can be designed at HDL level and synthesized as part of a target cell library.
    • 一种用于频率合成的方法和装置,其中数字频率合成器包括具有两个类似的环形振荡器以分别产生搜索频率和输出频率的时钟对,频率跟踪单元和时钟控制单元。 频率搜索方法包括两个阶段:一阶段是基于“剪枝搜索”的粗搜索阶段,其他阶段是基于“固定步长”算法的精细搜索阶段。 为了确定哪个搜索方案用于搜索目标频率并确定锁定状态,导出用于搜索和锁定的两个成本函数。 这两个成本函数定义搜索阈值和锁定阈值,并且这些阈值定义了成本窗口和锁定窗口。 如果频率误差高于搜索和锁定阈值,则会激活粗略搜索以估计正确的频率。 只有当频率误差落在搜索和锁定阈值之间时,才能激活精细搜索。 通过适当地分配这两个阈值,可以提高诸如着色和频率误差之类的搜索性能以及输出分辨率。 数字频率合成器,可以在HDL级别设计,并作为目标单元库的一部分合成。
    • 8. 发明授权
    • Sorter structure based on shiftable content memory
    • 基于可移动内容记忆的分拣机结构
    • US5504919A
    • 1996-04-02
    • US498108
    • 1995-07-05
    • Chen-Yi LeeJer-Min TsaiPo-Wen Hsieh
    • Chen-Yi LeeJer-Min TsaiPo-Wen Hsieh
    • G06F7/24G06F7/08
    • G06F7/24Y10S707/99937
    • An optimized high-speed sorter has a plurality of process elements connected in series. Each process element includes a sorting unit used to store a sorted item, and a comparing/controlling unit coupled to the sorting unit. In this sorter, all sorted items are compared with the input item simultaneously, and then are divided into an LE-group wherein the sorted items are less than or equal to the input item, and a G-group wherein the sorted items are greater than the input item. We assume that the sorted items are arranged in a descending sequence from left to right. In the insertion operation, the sorted items in the LE-group are shifted rightwards simultaneously, and the input item is loaded in the position between the LE-group and G-group. In the deletion operation, only the sorted items in the LE-group are shifted leftwards simultaneously. In order to accelerate the operation speed, the sorter adopts a pre-shift strategy.
    • 优化的高速分选机具有串联连接的多个处理元件。 每个处理单元包括用于存储分类项目的分类单元和耦合到分类单元的比较/控制单元。 在该分拣机中,将所有排序的项目与输入项目同时进行比较,然后被划分为LE组,其中排序的项目小于或等于输入项目,以及G组,其中排序的项目大于 输入项。 我们假设排序的项目按照从左到右的降序排列。 在插入操作中,LE组中的排​​序项目同时向右移动,并且输入项目被加载到LE组和G组之间的位置。 在删除操作中,只有LE组中的排​​序项目同时向左移动。 为了加快运营速度,分拣机采用了前转策略。