公开(公告)号：US20170257235A1

公开(公告)日：2017-09-07

申请号：US15424892

申请日：2017-02-06

申请人： MEDIATEK INC.

发明人： Tai-You Lu

IPC分类号： H04L25/03 ,  H04L12/873

CPC分类号： H04L25/03993 ,  G10K2210/108 ,  H03H1/02 ,  H03H11/0461 ,  H03H11/1213 ,  H03H11/1269 ,  H03H21/00 ,  H04L25/03057 ,  H04L25/03847 ,  H04L47/522

摘要： A filtering device includes a low-pass filter (LPF), a noise estimation circuit and a first combining circuit. The LPF receives and filters a pre-filtering signal to generate an output signal of the filtering device. The noise estimation circuit estimates an estimated noise signal according to the output signal and the pre-filtering signal. The first combining circuit subtracts the estimated noise signal from an input signal of the filtering device to generate the pre-filtering signal.

公开(公告)号：US20230291390A1

公开(公告)日：2023-09-14

申请号：US18319043

申请日：2023-05-17

申请人： International Business Machines Corporation

发明人： Sudipto Chakraborty ,  Raymond Richetta ,  John Francis Bulzacchelli

IPC分类号： H03H11/04

CPC分类号： H03H11/0461 ,  H03H11/0466

摘要： One or more systems, devices and/or methods of use provided herein relate to a baseband filter that can be used in a current-mode end-to-end signal path. The current-mode end-to-end signal path can include a digital to analog converter (DAC) operating in current-mode and an upconverting mixer, operating in current-mode and operatively coupled to the DAC. In one or more embodiments, a device used in the signal path can comprise a baseband filter that receives an input current and outputs an output current. The baseband filter can comprise a feedback loop component having an active circuit branch and a passive circuit branch coupled in a loop. A mirroring device can be coupled to the feedback loop component and can provide an output of the device. Selectively activating the mirroring device can vary gain, such as of the mirroring device.

公开(公告)号：US20160322957A1

公开(公告)日：2016-11-03

申请号：US14821885

申请日：2015-08-10

申请人： MEDIATEK Inc.

发明人： Yuan-Hung Chung ,  Ming-Yeh Hsu

IPC分类号： H03H11/04

CPC分类号： H03H11/0461 ,  H03F3/45273 ,  H03F2200/91 ,  H03H11/0405 ,  H03H11/0416 ,  H03H11/0466 ,  H03H11/1213 ,  H03H2011/0411

摘要： A frequency selective circuit includes a first transistor, an impedance element, a first capacitive element, a second capacitive element, a second capacitive and a second transistor. The first transistor includes a first terminal, a second terminal and a control terminal. The impedance element is coupled between the first terminal and the control terminal of the first transistor. The first capacitive element is coupled to the first terminal of the first transistor. The second capacitive element is coupled to the control terminal of the first transistor. The second transistor includes a first terminal, a second terminal and a control terminal, wherein the control terminal of the second transistor is coupled to the control terminal of the first transistor.

摘要翻译： 频率选择电路包括第一晶体管，阻抗元件，第一电容元件，第二电容元件，第二电容和第二晶体管。 第一晶体管包括第一端子，第二端子和控制端子。 阻抗元件耦合在第一晶体管的第一端子和控制端子之间。 第一电容元件耦合到第一晶体管的第一端。 第二电容元件耦合到第一晶体管的控制端。 第二晶体管包括第一端子，第二端子和控制端子，其中第二晶体管的控制端子耦合到第一晶体管的控制端子。

公开(公告)号：US20120161891A1

公开(公告)日：2012-06-28

申请号：US13381977

申请日：2010-12-01

申请人： Dattaguru. V. Kamat ,  Ananda Mohan P.V. ,  Gopalakrishna Prabhu K

发明人： Dattaguru. V. Kamat ,  Ananda Mohan P.V. ,  Gopalakrishna Prabhu K

IPC分类号： H03B5/08 ,  H03H11/04

CPC分类号： H03H11/0461 ,  H03F3/45475 ,  H03F2200/405 ,  H03H11/0433 ,  H03H11/32 ,  H03H11/486 ,  H03H11/50

摘要： Techniques are generally described herein related to filters including first operational transconductance amplifier (first OTA) and a second operational transconductance amplifier (second OTA). In some examples described herein, the first OTA and second OTA have substantially the same transconductance. The first and second OTAs can be configured to realize filters such as first-order all-pass filters, second-order all-pass filters, higher-order all-pass filters, and quadrature oscillators.

摘要翻译： 本文中通常描述的技术涉及包括第一操作跨导放大器（第一OTA）和第二操作跨导放大器（第二OTA）的滤波器。 在本文描述的一些示例中，第一OTA和第二OTA具有基本上相同的跨导。 第一和第二OTA可以被配置为实现诸如一阶全通滤波器，二阶全通滤波器，高阶全通滤波器和正交振荡器之类的滤波器。

公开(公告)号：US06483380B1

公开(公告)日：2002-11-19

申请号：US09663848

申请日：2000-09-18

申请人： Alyosha C. Molnar ,  Rahul Magoon

发明人： Alyosha C. Molnar ,  Rahul Magoon

IPC分类号： H00K502

CPC分类号： H03G7/08 ,  H03H11/0461

摘要： A GmC filter that suppresses unwanted signals generated by a GmC compression stage. The GmC filter utilizes the same compression stage for the decompression stages. By using the same compression stage for the decompression stages unwanted in-band signals generated by the compression stage are suppressed. Further, over all circuitry is decreased, power is saved, and GmC filter design is simplified.

摘要翻译： 一个GmC滤波器，可以抑制由GmC压缩级产生的不需要的信号。 GmC滤波器对于减压阶段使用相同的压缩级。 通过对减压阶段使用相同的压缩级，抑制了由压缩级产生的不期望的带内信号。 此外，在所有电路中都减少了功率，节省了GmC滤波器设计。

公开(公告)号：US20240204753A1

公开(公告)日：2024-06-20

申请号：US18068837

申请日：2022-12-20

申请人： QUALCOMM Incorporated

发明人： Peter GAZZERRO ,  Nitz SAPUTRA ,  Ashok SWAMINATHAN ,  Osama ELHADIDY ,  Bo YANG

IPC分类号： H03H11/04 ,  H03M1/06 ,  H03M1/66 ,  H04B1/04

CPC分类号： H03H11/0461 ,  H03M1/0626 ,  H03M1/66 ,  H04B1/04

摘要： Methods and apparatus for filtering a signal using a current-mode filter circuit implementing source degeneration. An example filter circuit generally includes an input node; an output node; a power supply node; a first transistor comprising a drain coupled to the input node; a second transistor comprising a drain coupled to the output node and comprising a gate coupled to a gate of the first transistor; a capacitive element coupled between the drain of the first transistor and the power supply node; a first resistive element coupled between the drain and the gate of the first transistor; a first source degeneration element coupled between a source of the first transistor and the power supply node; and a second source degeneration element coupled between a source of the second transistor and the power supply node.

公开(公告)号：US11736091B2

公开(公告)日：2023-08-22

申请号：US17555998

申请日：2021-12-20

申请人： International Business Machines Corporation

发明人： Sudipto Chakraborty ,  Raymond Richetta ,  John Francis Bulzacchelli

IPC分类号： H03H7/12 ,  H03H11/04

CPC分类号： H03H11/0461 ,  H03H11/0466

摘要： One or more systems, devices and/or methods of use provided herein relate to a baseband filter that can be used in a current-mode end-to-end signal path. The current-mode end-to-end signal path can include a digital to analog converter (DAC) operating in current-mode and an upconverting mixer, operating in current-mode and operatively coupled to the DAC. In one or more embodiments, a device used in the signal path can comprise a baseband filter that receives an input current and outputs an output current. The baseband filter can comprise a feedback loop component having an active circuit branch and a passive circuit branch coupled in a loop. A mirroring device can be coupled to the feedback loop component and can provide an output of the device. Selectively activating the mirroring device can vary gain, such as of the mirroring device.

公开(公告)号：US08483645B2

公开(公告)日：2013-07-09

申请号：US13038778

申请日：2011-03-02

申请人： Gregory Uehara ,  Xiaohua Fan

发明人： Gregory Uehara ,  Xiaohua Fan

IPC分类号： H04B1/26

CPC分类号： H03H11/0461 ,  H03F1/223 ,  H03F3/45076 ,  H03F3/72 ,  H03F2200/222 ,  H03F2200/294 ,  H03F2200/414 ,  H03F2200/429 ,  H03F2200/451 ,  H03F2203/45352 ,  H03F2203/45366 ,  H03F2203/45394 ,  H03F2203/45464 ,  H03F2203/7209 ,  H03F2203/7236

摘要： A circuit includes first and second transconductance stages each having an input to receive a signal, and a current combiner circuit coupled to outputs of the first and second transconductance stages. The current combiner circuit forms a path from the first transconductance stage to (i) one of a plurality of output paths or (ii) multiple output paths of the output paths. The current combiner circuit severs the second transconductance stage from the output paths when the first transconductance stage forms a path to one of the output paths. The current combiner circuit forms a path from the second transconductance stage to the multiple output paths when the first transconductance stage forms a path to the multiple output paths. The current combiner circuit couples current from the first transconductance stage to (i) a first output path or a second output path or (ii) both the first and second output paths.

摘要翻译： 电路包括每个具有用于接收信号的输入的第一和第二跨导级以及耦合到第一和第二跨导级的输出的电流组合器电路。 当前组合器电路形成从第一跨导级到（i）多条输出路径中的一条或（ii）输出路径的多个输出路径的路径。 当第一跨导级形成到一条输出路径的路径时，当前的组合器电路从输出路径切断第二跨导级。 当第一跨导级形成到多个输出路径的路径时，当前组合器电路形成从第二跨导级到多输出路径的路径。 当前组合器电路将来自第一跨导级的电流耦合到（i）第一输出路径或第二输出路径，或者（ii）第一和第二输出路径两者。

公开(公告)号：US07496865B2

公开(公告)日：2009-02-24

申请号：US11419313

申请日：2006-05-19

申请人： Chun-Ming Chang ,  Shu-Hui Tu

发明人： Chun-Ming Chang ,  Shu-Hui Tu

IPC分类号： G06F17/50

CPC分类号： H03F3/45 ,  H03F3/68 ,  H03H11/0455 ,  H03H11/0461

摘要： Nth-order OTA-C (Operational Transconductance Amplifiers and Capacitors) filter structures are realized by using the analytical synthesis method to achieve the following three important criteria simultaneously: filters use just n grounded capacitors, each of which is located at each of just n nodes in the realized circuit, because they use smaller area in the IC, and they can absorb equivalent shunt capacitive parasites; filters employ only single-ended-input OTAs to overcome the feed-through effects due to finite input parasitic capacitances associated with double-input OTAs to replace the same positions of the n given capacitors; and filters have the least number-of components (passive and active) for a given order to reduce power consumption, chip areas, and noise. Both the first and the second criteria lead to the minimum parasitic distortion and make the most precise output signals. And the third criterion produces the cheapest chip.

摘要翻译： N阶OTA-C（运算跨导放大器和电容器）滤波器结构通过使用分析合成方法同时实现以下三个重要标准来实现：滤波器仅使用n个接地电容器，每个接地电容器位于n个节点的每个节点 在实现的电路中，因为它们在IC中使用较小的面积，并且它们可以吸收等效的分流电容寄生物; 滤波器仅使用单端输入OTAs来克服由于与双输入OTAs相关联的有限输入寄生电容而导致的馈通效应，以代替n个给定电容器的相同位置; 并且滤波器对于给定的顺序具有最少数量的组件（无源和有源），以减少功耗，芯片面积和噪声。 第一个和第二个标准都会导致最小的寄生失真，并产生最精确的输出信号。 而第三个标准是生产最便宜的芯片。

公开(公告)号：US20070057732A1

公开(公告)日：2007-03-15

申请号：US11419313

申请日：2006-05-19

申请人： Chun-Ming Chang ,  Shu-Hui Tu

发明人： Chun-Ming Chang ,  Shu-Hui Tu

IPC分类号： H03F3/191

CPC分类号： H03F3/45 ,  H03F3/68 ,  H03H11/0455 ,  H03H11/0461

摘要： Nth-order OTA-C (Operational Transconductance Amplifiers and Capacitors) filter structures are realized by using the analytical synthesis method to achieve the following three important criteria simultaneously: filters use just n grounded capacitors, each of which is located at each of just n nodes in the realized circuit, because they use smaller area in the IC, and they can absorb equivalent shunt capacitive parasites; filters employ only single-ended-input OTAs to overcome the feed-through effects due to finite input parasitic capacitances associated with double-input OTAs to replace the same positions of the n given capacitors; and filters have the least number-of components (passive and active) for a given order to reduce power consumption, chip areas, and noise. Both the first and the second criteria lead to the minimum parasitic distortion and make the most precise output signals. And the third criterion produces the cheapest chip.

摘要翻译： N阶OTA-C（运算跨导放大器和电容器）滤波器结构通过使用分析合成方法同时实现以下三个重要标准来实现：滤波器仅使用n个接地电容器，每个接地电容器位于只有n个节点 在实现的电路中，因为它们在IC中使用较小的面积，并且它们可以吸收等效的分流电容寄生物; 滤波器仅使用单端输入OTAs来克服由于与双输入OTAs相关联的有限输入寄生电容而导致的馈通效应，以代替n个给定电容器的相同位置; 并且滤波器对于给定的顺序具有最少数量的组件（无源和有源），以减少功耗，芯片面积和噪声。 第一个和第二个标准都会导致最小的寄生失真，并产生最精确的输出信号。 而第三个标准是生产最便宜的芯片。