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21. 发明申请

US20190103645A1 Bandstop Filters with Power-Dependent Stopband Attenuation 审中-公开
公开(公告)号：US20190103645A1
公开(公告)日：2019-04-04
申请号：US15720741
申请日：2017-09-29
申请人： The Government of the United States of America, as represented by the Secretary of the Navy
发明人： Adrew C. Guyette , Eric J. Naglich
IPC分类号： H01P1/20 , H03H19/00 , H01P1/00
CPC分类号： H01P1/20 , H01P1/005 , H01P1/20381 , H03H7/0153 , H03H7/12 , H03H19/002 , H03H2007/013 , H03H2011/0488
摘要： Systems and method are provided for implementing filters whose response automatically and continuously reconfigures between an all-pass response and a bandstop response as the power level of signals within their bandwidth changes. Embodiments of the present disclosure allow high power signals within a designable bandwidth to be strongly attenuated while minimally affecting signals in adjacent bandwidths and further allow low power signals in the designable bandwidth to pass with minimal attenuation.

22. 发明授权

US09973173B2 Switch topology for switching filters multiplexers 有权
公开(公告)号：US09973173B2
公开(公告)日：2018-05-15
申请号：US15010829
申请日：2016-01-29
申请人： RF Micro Devices, Inc.
发明人： Nadim Khlat , Marcus Granger-Jones
IPC分类号： H01P1/10 , H01P1/213 , H03H19/00 , H04B1/00 , H04B1/44 , H03H7/46
CPC分类号： H03H19/002 , H03H7/465 , H03H2250/00 , H04B1/006
摘要： This disclosure relates to radio frequency (RF) front end circuitry used to route RF signals. In one embodiment, the RF front end circuitry has a filter circuit and a switch device. The switch device includes a common port, an RF port, and switchable path connected in series between the common port and the RF port. The switch device is configured to present approximately the filter capacitance of the filter circuit at the common port when the switchable path is closed. However, when the switchable path is open, the switch device is configured to present a device capacitance at the common port that is approximately equal to the filter capacitance of the filter circuit. In this manner, if the common port is connected to an antenna, the capacitance seen by the antenna from the common port remains substantially unchanged regardless of which of the switchable path is opened or closed.

23. 发明授权

US09847772B2 N-path filters with flatter frequency response 有权
公开(公告)号：US09847772B2
公开(公告)日：2017-12-19
申请号：US15014305
申请日：2016-02-03
申请人： QUALCOMM Incorporated
发明人： Milad Darvishi , Hajir Hedayati , Faramarz Sabouri
IPC分类号： H03K5/00 , H03H19/00
CPC分类号： H03H19/002
摘要： Certain aspects of the present disclosure provide N-path filters with wider passbands and steeper rejection than conventional N-path filters with only a single pole in each filter path. These N-path filters also have a flatter passband with decreased passband droop. One example N-path filter generally includes a plurality of branches selectively connected with a common node, each branch of the N-path filter comprising a switch connected in series with an impedance comprising a common drain amplifier circuit. In certain aspects, the amplifier circuit may include a degeneration circuit for stability and/or a poly-phase feedback circuit to reduce in-band peaking.

24. 发明授权

US09768797B2 Receiver for simultaneous signals in carrier aggregation 有权
公开(公告)号：US09768797B2
公开(公告)日：2017-09-19
申请号：US14931665
申请日：2015-11-03
申请人： Nokia Technologies Oy
发明人： Chadi Jabbour , Seyed Majid Homayouni , Sudhir Aggarwal , Vason P. Srini
IPC分类号： H04L27/00 , H03M3/00
CPC分类号： H03M3/406 , H03H19/002 , H03M3/30 , H03M3/462 , H04L5/001
摘要： Methods and apparatus, including computer program products, are provided for receivers. In one aspect there is provided an apparatus. The apparatus may include an in-phase sigma delta receiver coupled to a radio frequency input port providing at least a first carrier aggregation signal and a second carrier aggregation signal; and a quadrature phase sigma delta receiver coupled to the radio frequency input port providing at least the first carrier aggregation signal and the second aggregation signal, wherein the in-phase sigma delta receiver and the quadrature phase sigma delta receiver each include a resonator stage circuitry including at least one variable capacitor that varies notch frequencies to provide passbands for the first carrier aggregation signal and the second carrier aggregation signal. Related apparatus, systems, methods, and articles are also described.

25. 发明申请

US20170214391A1 HIGH REJECTION WIDEBAND BANDPASS N-PATH FILTER 审中-公开
公开(公告)号：US20170214391A1
公开(公告)日：2017-07-27
申请号：US15003417
申请日：2016-01-21
申请人： QUALCOMM Incorporated
发明人： Hajir HEDAYATI , Milad DARVISHI , Jeremy Darren DUNWORTH , Faramarz SABOURI
IPC分类号： H03H11/08
CPC分类号： H03H19/002 , H03H11/40 , H03H11/50
摘要： Certain aspects of the present disclosure provide an N-path filter implemented using a generalized impedance converter (GIC) circuit. The GIC circuit is configured such that the N-path filter has a desired frequency response, which may include a wide passband with steeper rejection than a conventional N-path filter with only a single pole in each filter path. Certain aspects of the present disclosure provide an N-path filter having a frequency response with multiple concurrent passbands. In certain aspects, the N-path filter with multiple passbands is implemented using the GIC circuit. In other aspects, the N-path filter may include a bandpass response circuit where an inductance of the bandpass response circuit may be implemented using gyrators.

26. 发明授权

US09680448B2 Gain-boosted n-path passive-mixer-first receiver with a single mixing step 有权
公开(公告)号：US09680448B2
公开(公告)日：2017-06-13
申请号：US14862392
申请日：2015-09-23
申请人： University of Macau
发明人： Pui-In Mak , Zhicheng Lin , Rui Paulo da Silva Martins
IPC分类号： H04B1/16 , H03H11/04 , H03H11/12 , H03H19/00 , H03F1/02 , H03F3/19 , H03F3/45 , H03B5/12
CPC分类号： H03H11/0472 , H03B5/1237 , H03B5/1246 , H03B2202/06 , H03F1/0205 , H03F3/19 , H03F3/45076 , H03F2200/294 , H03F2200/451 , H03H11/1291 , H03H19/002 , H03H19/004 , H03H2011/0483 , H03H2210/025 , H04B1/16 , H04B1/1638
摘要： The present invention discloses a gain-boosted n-path passive-mixer-first receiver. According to another aspect of the present disclosure, a gain-boosted n-path passive-mixer-first receiver is provided. The receiver includes a number n of switch-capacitor (sc) sets, a resistor, and a transconductance amplifier. The sc sets connect in parallel, and the sc sets have a first node and a second node. The resistor connects to the first node. The transconductance amplifier connects to the resistor and the second node.

27. 发明申请

US20160065195A1 MULTIPHASE OSCILLATING SIGNAL GENERATION AND ACCURATE FAST FREQUENCY ESTIMATION 审中-公开
标题翻译：多相振荡信号的生成和精确的快速估计
公开(公告)号：US20160065195A1
公开(公告)日：2016-03-03
申请号：US14471530
申请日：2014-08-28
申请人： QUALCOMM Incorporated
发明人： Mohammad FARAZIAN , Serkan SAYILIR , Marco ZANUSO , Yiwu TANG
IPC分类号： H03K5/15 , H03H11/22 , H03H11/20
CPC分类号： H03K5/1506 , H03H11/22 , H03H19/002 , H03K2005/00286
摘要： Certain aspects of the present disclosure provide methods and apparatus for generating multiple oscillating signals having different phases. One example multiphase generating circuit generally includes a first phase shifting circuit configured to phase shift an input signal having an input frequency, such that an output signal of the first phase shifting circuit has a first phase difference with respect to the input signal; a first frequency dividing circuit configured to receive the input signal and output a first set of signals having a first frequency less than the input frequency of the input signal; and a second frequency dividing circuit configured to receive the output signal of the first phase shifting circuit and output a second set of signals having a second frequency less than the input frequency of the input signal. The multiphase signals may be used for fast frequency estimation of the input signal or in N-path filters.
摘要翻译：本公开的某些方面提供了用于产生具有不同相位的多个振荡信号的方法和装置。一个示例性多相生成电路通常包括：第一移相电路，被配置为使具有输入频率的输入信号相移，使得第一移相电路的输出信号相对于输入信号具有第一相位差; 第一分频电路，被配置为接收所述输入信号并输出具有小于所述输入信号的输入频率的第一频率的第一组信号; 以及第二分频电路，被配置为接收第一移相电路的输出信号并输出具有小于输入信号的输入频率的第二频率的第二组信号。多相信号可用于输入信号的快速频率估计或N路径滤波器。

28. 发明申请

US20130036147A1 INFINITE IMPULSE RESPONSE (IIR) FILTER AND FILTERING METHOD 审中-公开
标题翻译：无限冲动响应（IIR）滤波器和滤波方法
公开(公告)号：US20130036147A1
公开(公告)日：2013-02-07
申请号：US13196660
申请日：2011-08-02
申请人： Sheng-Hong Yan
发明人： Sheng-Hong Yan
IPC分类号： G06F17/10
CPC分类号： H03H15/00 , H03H15/023 , H03H19/002
摘要： An infinite impulse response (IIR) filter is provided. The IIR filter includes an amplifier and a filter coupled in a feedback path of the amplifier. The amplifier generates an output signal according to an input signal. The filter filters the output signal according to a first transfer function and provides the filtered output signal to an input of the amplifier. The IIR filter and the first filter have the same order larger than one.
摘要翻译：提供无限脉冲响应（IIR）滤波器。 IIR滤波器包括耦合在放大器的反馈路径中的放大器和滤波器。放大器根据输入信号产生输出信号。滤波器根据第一传递函数对输出信号进行滤波，并将滤波后的输出信号提供给放大器的输入。 IIR滤波器和第一个滤波器的顺序大于1。

29. 发明授权

US5491453A Narrow-band filter having a variable center frequency 失效
标题翻译：具有可变中心频率的窄带滤波器
公开(公告)号：US5491453A
公开(公告)日：1996-02-13
申请号：US194316
申请日：1994-02-10
申请人： Masaki Ichihara
发明人： Masaki Ichihara
IPC分类号： H03H17/02 , H03H19/00 , H04B1/10
CPC分类号： H03H19/002
摘要： In a narrow-band filter for filtering an input signal having a predetermined frequency and comprising first through n-th low-pass filters (13-1 to 13-n) which are connected in parallel to one another, a switching circuit time divisionally connects the first through the n-th low-pass filters between input and output terminals (11, 12). The first through the n-th low-pass filters, thereby, time divisionally filters the input signal for first through n-th filtering durations, respectively. A control circuit (30) is supplied with a frequency designation signal designating the predetermined frequency and controls the switching circuit to change at least one of the first through the n-th filtering durations in accordance with the frequency designation signal.
摘要翻译：在用于对具有预定频率的输入信号进行滤波并且包括彼此并联连接的第一至第n低通滤波器（13-1至13-n）的窄带滤波器中，切换电路时间分段连接在输入和输出端（11,12）之间的第一至第n低通滤波器。第一个到第n个低通滤波器，从而分别对输入信号进行第一至第n滤波持续时间的分时滤波。向控制电路（30）提供指定预定频率的频率指定信号，并根据频率指定信号控制开关电路改变第一至第n滤波持续时间中的至少一个。

30. 发明授权

US4446438A Switched capacitor n-path filter 失效
标题翻译：开关电容n路径滤波器
公开(公告)号：US4446438A
公开(公告)日：1984-05-01
申请号：US314827
申请日：1981-10-26
申请人： Chieh Chang , Man S. Lee
发明人： Chieh Chang , Man S. Lee
IPC分类号： G06G7/186 , H03H19/00 , G06G7/18 , H03B1/00 , H03K5/00
CPC分类号： H03H19/002 , G06G7/1865
摘要： A switched capacitor N-path filter in which all capacitors that introduce delay in the paths, in that they have memory and are characterized such that the new charge flow into each such capacitor during each commutation cycle depends on the old charge on it from the previous commutation cycle, are replaced with an associated plurality of N-commutating capacitors.
摘要翻译：一种开关电容N路径滤波器，其中引入路径中的延迟的所有电容器，因为它们具有存储器并被表征，使得在每个换向循环期间，新的电荷流入每个这样的电容器取决于来自前一个换相周期由相关联的多个N整流电容器代替。

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