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1. 发明授权

US07365604B2 RF amplifier with a bias boosting scheme 有权
标题翻译： RF放大器采用偏压升压方案
公开(公告)号：US07365604B2
公开(公告)日：2008-04-29
申请号：US11303358
申请日：2005-12-16
申请人： Sifen Luo , Yiping Fan , Hongyu Li , Chieh-Yuan Chao
发明人： Sifen Luo , Yiping Fan , Hongyu Li , Chieh-Yuan Chao
IPC分类号： H03F3/04
CPC分类号： H03F1/30 , H03F3/189 , H03F2200/108 , H03F2200/18 , H03F2200/451
摘要： The present invention provides methods and apparatuses for an amplifier circuit for amplifying an input signal. An amplifier circuit for amplifying an input signal comprises an amplifying transistor circuit having a power transistor and a dc bias circuit having a plurality of current mirror circuits and a discharge transistor wherein the discharge transistor and the power transistor form a combined current mirror circuit to control quiescent current in the power transistor.
摘要翻译：本发明提供了用于放大输入信号的放大器电路的方法和装置。用于放大输入信号的放大器电路包括具有功率晶体管的放大晶体管电路和具有多个电流镜电路和放电晶体管的直流偏置电路，其中放电晶体管和功率晶体管形成组合电流镜电路以控制静止功率晶体管中的电流。

2. 发明申请

US20070139120A1 RF amplifier with a bias boosting scheme 有权
标题翻译： RF放大器采用偏压升压方案
公开(公告)号：US20070139120A1
公开(公告)日：2007-06-21
申请号：US11303358
申请日：2005-12-16
申请人： Sifen Luo , Yiping Fan , Hongyu Li , Chieh-Yuan Chao
发明人： Sifen Luo , Yiping Fan , Hongyu Li , Chieh-Yuan Chao
IPC分类号： H03F3/04
CPC分类号： H03F1/30 , H03F3/189 , H03F2200/108 , H03F2200/18 , H03F2200/451
摘要： The present invention provides methods and apparatuses for an amplifier circuit for amplifying an input signal. An amplifier circuit for amplifying an input signal comprises an amplifying transistor circuit having a power transistor and a dc bias circuit having a plurality of current mirror circuits and a discharge transistor wherein the discharge transistor and the power transistor form a combined current mirror circuit to control quiescent current in the power transistor.
摘要翻译：本发明提供了用于放大输入信号的放大器电路的方法和装置。用于放大输入信号的放大器电路包括具有功率晶体管的放大晶体管电路和具有多个电流镜电路和放电晶体管的直流偏置电路，其中放电晶体管和功率晶体管形成组合电流镜电路以控制静止功率晶体管中的电流。

3. 发明申请

US20070040604A1 Active polyphase filter 有权
公开(公告)号：US20070040604A1
公开(公告)日：2007-02-22
申请号：US11209914
申请日：2005-08-22
申请人： Kanyu Cao , Yiping Fan , Hongyu Li , Chieh-Yuan Chao
发明人： Kanyu Cao , Yiping Fan , Hongyu Li , Chieh-Yuan Chao
IPC分类号： H03K5/00
CPC分类号： H03H11/22 , H03H2007/0192 , H03H2011/0494
摘要： The present invention provides methods and apparatuses for a polyphase filter, comprising: a first and second cascoded differential amplifiers configured to receive a first and second differential signals, the first cascoded differential amplifier having a first resistor coupled between current legs of the first cascoded differential amplifier and the second cascoded differential amplifier having a first capacitor coupled between current legs of the second cascoded differential amplifier; and a third and fourth cascoded differential amplifiers configured to receive said first and said second differential signals, the third cascoded differential amplifier having a second resistor coupled between current legs of the third cascoded differential amplifier and the fourth cascoded differential amplifier having a second capacitor coupled between current legs of the fourth cascoded differential amplifier; wherein the first and second cascoded differential amplifiers are configured to provide a first differential output in response to the first and second differential signals and the third and fourth cascoded differential amplifiers are configured to provide a second differential output in response to the first and second differential signals.

4. 发明授权

US09640984B2 Current limiting device, current limiter and current limiting system for power grid 有权
公开(公告)号：US09640984B2
公开(公告)日：2017-05-02
申请号：US14441918
申请日：2013-01-09
申请人： Shaogui Al , Chuan Wang , Yongning Huang , Yiping Fan , Guoyong Zhang , Yanjun Li , Ning Pan , Shuang Zhang
发明人： Shaogui Al , Chuan Wang , Yongning Huang , Yiping Fan , Guoyong Zhang , Yanjun Li , Ning Pan , Shuang Zhang
IPC分类号： H02H9/02
CPC分类号： H02H9/02 , H02H9/021
摘要： A current limiting device for a power grid includes a first current limiting reactor; a first smart fast switch connected with the first current limiting reactor in parallel; a current transformer sleeved on a bus bar located on one side of a circuit resulting from the parallel connection of the first current limiting reactor with the first smart fast switch to monitor the current in the bus bar in real time; and a controller connected with the current transformer to control the switch-off of the first smart fast switch when the current in the bus bar is higher than a first preset value and the switch-on of the first smart fast switch when the current in the bus bar is smaller than a second preset value, wherein the first preset value is higher than the second preset value. The current limiting device improves the operational reliability of a power grid.

5. 发明申请

US20150318688A1 CURRENT LIMITING DEVICE, CURRENT LIMITER AND CURRENT LIMITING SYSTEM FOR POWER GRID 有权
标题翻译：电流限制装置，电流限制和电流限制系统
公开(公告)号：US20150318688A1
公开(公告)日：2015-11-05
申请号：US14441918
申请日：2013-01-09
申请人： Shaogui AL , Chuan WANG , Yongning HUANG , Yiping FAN , Guoyong ZHANG , Yanjun LI , Ning PAN , Shuang ZHANG
发明人： Shaogui AI , Chuan WANG , Yongning HUANG , Yiping FAN , Guoyong ZHANG , Yanjun LI , Ning PAN , Shuang ZHANG
IPC分类号： H02H9/02
CPC分类号： H02H9/02 , H02H9/021
摘要： A current limiting device for a power grid includes a first current limiting reactor; a first smart fast switch connected with the first current limiting reactor in parallel; a current transformer sleeved on a bus bar located on one side of a circuit resulting from the parallel connection of the first current limiting reactor with the first smart fast switch to monitor the current in the bus bar in real time; and a controller connected with the current transformer to control the switch-off of the first smart fast switch when the current in the bus bar is higher than a first preset value and the switch-on of the first smart fast switch when the current in the bus bar is smaller than a second preset value, wherein the first preset value is higher than the second preset value. The current limiting device improves the operational reliability of a power grid.
摘要翻译：电网的限流装置包括第一限流电抗器; 与第一限流电抗器并联连接的第一智能快速开关; 电流互感器套在位于电路一侧的总线上，该电流互感器由第一限流电抗器与第一智能快速开关的并联连接而实时监控母线中的电流; 以及与所述电流互感器连接的控制器，用于当所述母线中的电流高于第一预设值时控制所述第一智能快速开关的断开，并且当所述第一智能快速开关中的电流为母线小于第二预设值，其中第一预设值高于第二预设值。限流装置提高了电网的运行可靠性。

6. 发明授权

US07424047B2 Receiver based method for de-spreading of spread spectrum signal 有权
标题翻译：基于接收机的扩频信号解扩方法
公开(公告)号：US07424047B2
公开(公告)日：2008-09-09
申请号：US10712643
申请日：2003-11-13
申请人： Yiping Fan , Syang-Myau Hwang , Hongyu Li , Chieh-Yuan Chao
发明人： Yiping Fan , Syang-Myau Hwang , Hongyu Li , Chieh-Yuan Chao
IPC分类号： H04B1/00
CPC分类号： H04B1/7097 , H04B1/709 , H04J13/00 , H04L25/061 , H04L27/142
摘要： A spread spectrum receiver whose de-spreading process based on transformed spreading codes is provided. Instead of de-spreading with original spreading codes, this approach de-spreads received signal with the spreading codes transformed from the original codes in order to eliminate the negative impact of system impairments such as frequency offset to a spread spectrum receiver. Before de-spreading with the transformed code, the received signal goes through the same transformation as the original codes do. After a transformation, the transformed codes may exist some undesirable property such as spreading code having DC content. An approach is given to cancel unwanted side effects relating the transformed spreading codes. The approaches are very effective for spread spectrum system based on frequency modulation scheme such as MSK. For this kind of system, the frequency offset translates to DC offset after the transformation and the DC offset can be cancel since the DC property of the transformed spreading code is known in advance.
摘要翻译：一种扩展频谱接收机，其基于变换的扩频码进行解扩处理。代替使用原始扩展码去扩展，该方法使用从原始码转换的扩展码对接收信号进行解扩，以消除诸如频率偏移对扩频接收机的系统损伤的负面影响。在使用变换后的代码进行解扩后，接收到的信号经过与原始代码相同的转换。在变换之后，变换的代码可能存在一些不期望的属性，例如具有DC内容的扩展码。给出了一种解决与转换的扩展码有关的不必要的副作用的方法。这种方法对于基于MSK等频率调制方案的扩频系统非常有效。对于这种系统，频率偏移转换为变换后的DC偏移，并且可以取消DC偏移，因为转换的扩展码的DC属性预先已知。

7. 发明授权

US07408395B2 Circuits and methods for fast-settling signal alignment and DC offset removal 有权
标题翻译：用于快速建立信号对准和DC偏移去除的电路和方法
公开(公告)号：US07408395B2
公开(公告)日：2008-08-05
申请号：US10428444
申请日：2003-05-01
申请人： Kanyu Cao , Yiping Fan , Hongyu Li , Chieh-Yuan Chao
发明人： Kanyu Cao , Yiping Fan , Hongyu Li , Chieh-Yuan Chao
IPC分类号： H03L5/00
CPC分类号： H04L25/0296
摘要： Fast settling circuits and methods designed to align input signal amplitude level and to remove DC offset voltages with minimal loss of low frequency signal in receiving analog circuits are disclosed. With the key innovative circuits and methods for signal peak alignment, the disclosed circuits and methods achieve fast settling without significant attenuation of the input signal. Peak aligning circuits and methods can be implemented along with conventional RC AC coupling circuits. In applying the aligning circuits and methods to differential signal pair, DC offsets can be easily removed.
摘要翻译：公开了用于调整输入信号幅度电平的快速稳定电路和方法，并且在接收模拟电路中以最小的低频信号损失去除DC偏移电压。利用用于信号峰对准的关键创新电路和方法，所公开的电路和方法实现快速建立，而没有输入信号的显着衰减。峰值对准电路和方法可以与传统的RC AC耦合电路一起实现。在将对准电路和方法应用于差分信号对时，可以容易地去除直流偏移。

8. 发明授权

US07366227B2 Chip-to-symbol receiver despreader architectures and methods for despreading spread spectrum signals 有权
标题翻译：用于解扩扩频信号的片对符号接收机解扩器架构和方法
公开(公告)号：US07366227B2
公开(公告)日：2008-04-29
申请号：US10876160
申请日：2004-06-23
申请人： Syang-Myau Hwang , Yiping Fan , Chen-Yi Chang , Hongyu Li , Chieh-Yuan Chao
发明人： Syang-Myau Hwang , Yiping Fan , Chen-Yi Chang , Hongyu Li , Chieh-Yuan Chao
IPC分类号： H04B1/00
CPC分类号： H04J13/00 , H04B1/709 , H04B1/7097 , H04L25/061 , H04L27/142
摘要： In a spread spectrum system, methods and despreader architectures for despreading the received spreaded codes with the use of a single correlator and a single correlation code is provided. Before despreading the incoming received spreaded codes, a single correlation code is generated using a symbol from a set of symbols that has been mapped into a set of differential encoded PN codes. Despreading output samples for each received spreaded code are obtained by correlating the received spreaded code with this single correlation code. Correlation is accomplished by multiplying each received sample of the received spreaded codes with the correlation code samples and accumulating the products of this multiplication. After correlation, the index for the maximum or minimum peak of the despreading output samples for each code is identified. This index can then be mapped into a symbol corresponding to the transmitted information. Corresponding despreader architectures comprise of a number of taps attached to a series of shift registers. Received samples of each received spreaded codes are inputted into the shift registers. The despreader architectures accumulates the products of multiplication of the value of the shift register with a predetermined value associated with each tap to produce the despreading output samples of a received spreaded code. It identifies the despreading output index producing the maximum of the absolute value of the despreading output and maps said index into a symbol corresponding to the transmitted information.
摘要翻译：在扩展频谱系统中，提供了使用单个相关器和单个相关码解扩接收的扩展码的方法和解扩器体系结构。在解扩输入的接收的扩展码之前，使用已经被映射到一组差分编码的PN码的符号集合中的符号来生成单个相关码。通过将接收到的扩展代码与该单个相关代码相关联来获得每个接收到的扩展代码的解扩输出样本。通过将接收到的扩展码的每个接收样本与相关代码采样相乘并累加该乘法的乘积来实现相关。在相关之后，识别每个代码的解扩输出样本的最大或最小峰值的索引。然后可以将该索引映射到对应于发送的信息的符号。相应的解扩器架构包括附接到一系列移位寄存器的多个抽头。每个接收的分散码的接收样本被输入到移位寄存器中。解扩器架构将移位寄存器的值乘以与每个抽头相关联的预定值的乘积累积以产生接收到的扩展代码的解扩输出样本。它识别解扩输出索引，产生解扩输出的绝对值的最大值，并将所述索引映射成对应于发送信息的符号。

9. 发明申请

US20060267677A1 Method and system for passband ripple cancellation in cascading filters 审中-公开
标题翻译：级联滤波器中通带纹波消除的方法和系统
公开(公告)号：US20060267677A1
公开(公告)日：2006-11-30
申请号：US10570050
申请日：2004-08-28
申请人： Yiping Fan
发明人： Yiping Fan
IPC分类号： H03K5/00
CPC分类号： H03F3/45475 , H03F2203/45138 , H03F2203/45166 , H03H11/1217 , H03H11/1252
摘要： A composite filter (200) includes at least two cascading filters (202, 204) designed to minimize a passband ripple in the composite filter (200). The at least two cascading filters (202, 204) may also be designed to maximize stopband rejection in the composite filter (200). Filter characteristics, such as the order, bandwidth, stopband attenuation, and ripple magnitude, for the cascading filters (202, 204) are selected in order to achieve minimal passband ripple and maximum stopband rejection in the composite filter (200). The passband ripple in the composite filter (200) is minimized or cancelled by having the passband ripple in the cascading filters (202, 204) be equal or nearly equal in magnitude but out of phase with respect to each other.
摘要翻译：复合滤波器（200）包括设计成使复合滤波器（200）中的通带纹波最小化的至少两个级联滤波器（202,204）。还可以将至少两个级联滤波器（202,204）设计成使复合滤波器（200）中的阻带抑制最大化。选择用于级联滤波器（202,204）的滤波器特性，例如顺序，带宽，阻带衰减和纹波幅度，以便在复合滤波器（200）中实现最小通带纹波和最大阻带抑制。复合滤波器（200）中的通带纹波通过使级联滤波器（202,204）中的通带纹波相等或几乎相等于或相差相位而被最小化或抵消。

10. 发明授权

US06456164B1 Sigma delta fractional-N frequency divider with improved noise and spur performance 失效
$Sigma delta fractional-N frequency divider with improved noise and spur performance$
标题翻译： Sigma delta分数N分频器，具有改进的噪声和支线性能
公开(公告)号：US06456164B1
公开(公告)日：2002-09-24
申请号：US09800118
申请日：2001-03-05
申请人： Yiping Fan
发明人： Yiping Fan
IPC分类号： H03L718
CPC分类号： H03L7/1976 , H03K23/68
摘要： A frequency synthesizer is provided that allows for a half-cycle division of the synthesized frequency. In a conventional sigma-delta fractional-N frequency synthesizer, a controllable divider is configured to allow for the division of the synthesized frequency by an integer factor of N or an integer factor of N+1. A sigma-delta calculator controls a half-cycle divider so as to selectively divide the synthesized frequency by an integer factor of N, or a fractional factor of (N+½). If a higher order sigma-delta calculator is employed that provides S output symbols, the half-cycle divider is correspondingly controlled to select a division factor of (N+s/2), where s is selectable from set of S symbols.
摘要翻译：提供了允许合成频率的半周期分频的频率合成器。在常规的Σ-Δ分数N频率合成器中，可控分频器被配置为允许合成频率除以整数因子N或N + 1的整数因子。 Σ-Δ计算器控制半周期分频器，以便选择性地将合成频率除以N的整数因子或（N +½）的分数因子。如果采用提供S个输出符号的较高阶Σ-Δ计算器，则相应地控制半周分频器以选择（N + s / 2）的分频因子，其中s可从S个符号集中选择。

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