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1. 发明申请

US20080048773A1 METHOD AND APPARATUS FOR DC OFFSET CANCELLATION IN AMPLIFIERS 有权
标题翻译：放大器中DC偏移消除的方法和装置
公开(公告)号：US20080048773A1
公开(公告)日：2008-02-28
申请号：US11466465
申请日：2006-08-23
申请人： Amr Fahim , Hassan Elwan , Aly Ismail
发明人： Amr Fahim , Hassan Elwan , Aly Ismail
IPC分类号： H03F1/02
CPC分类号： H03F3/45475 , H03F3/45968 , H03F3/45977 , H03F2200/78 , H03F2203/45212 , H03F2203/45424 , H03F2203/45438 , H03F2203/45444 , H03F2203/45618
摘要： A system, circuit, and method of canceling DC offset errors in cascaded amplifiers comprises arranging a plurality of any of analog voltage and analog current amplifier stages in any of cascaded and parallel configurations; operatively connecting a feedback comparator and digital logic in a feedback path around a given amplifier, wherein the digital logic comprises a finite state machine implementing an adaptive search algorithm comprising fixed switching and modulated switching; operatively connecting a switch at a differential input of the amplifier to short both input terminals of the amplifier; performing fixed switching on binary weighted elements generating discrete analog steps used to vary any of DC offset voltage and current at the input of the amplifier; and performing modulated switching on at least one lower least significant bit (LSB) of all bits used to vary the any of the DC offset voltage and current.
摘要翻译：在级联放大器中消除DC偏移误差的系统，电路和方法包括以任何级联和并联配置布置多个模拟电压和模拟电流放大器级; 在给定的放大器周围的反馈路径中可操作地连接反馈比较器和数字逻辑，其中数字逻辑包括实现包括固定切换和调制切换的自适应搜索算法的有限状态机; 可操作地连接放大器的差分输入端的开关以缩短放大器的两个输入端子; 对二进制加权元件执行固定切换，产生用于改变放大器输入处的DC偏移电压和电流中的任何一个的离散模拟步骤; 以及对用于改变DC偏移电压和电流中的任何一个的所有位的至少一个较低最低有效位（LSB）执行调制开关。

2. 发明申请

US20170111018A1 CHOPPER STABILIZED AMPLIFIER 有权
公开(公告)号：US20170111018A1
公开(公告)日：2017-04-20
申请号：US15293675
申请日：2016-10-14
申请人： ROHM CO., LTD.
发明人： Sachito HORIUCHI , Naohiro NOMURA
IPC分类号： H03F3/45
CPC分类号： H03F3/45636 , H03F1/02 , H03F1/303 , H03F1/34 , H03F3/005 , H03F3/393 , H03F3/45 , H03F3/45183 , H03F3/45475 , H03F3/45744 , H03F2203/45014 , H03F2203/45026 , H03F2203/45116 , H03F2203/45174 , H03F2203/45444
摘要： A main amplifier generates an output signal SOUT according to a difference between first and second voltages VP and VN. A first gm amplifier is arranged as a differential input stage. A second, fully differential, gm amplifier amplifies a voltage difference between its non-inverting and inverting input terminals, and outputs a differential current signal I3N/I3P via its inverting and non-inverting output terminals. An integrator integrates a differential input current I4P/I4N input via its non-inverting and inverting input terminals, and samples and holds the signal every predetermined period, to generate a differential voltage signal. A first selector is arranged as an upstream stage of the second gm amplifier, and outputs the differential input signal without change or otherwise after swapping. A second selector is arranged as a downstream stage of the second gm amplifier, and outputs the signal I3N/I3P output from the second gm amplifier without change or otherwise after swapping.

3. 发明申请

US20140184331A1 Amplifier Circuits and Methods of Amplifying an Input Signal 有权
标题翻译：放大器电路和放大输入信号的方法
公开(公告)号：US20140184331A1
公开(公告)日：2014-07-03
申请号：US13732135
申请日：2012-12-31
申请人： Axel Thomsen , Gang Yuan
发明人： Axel Thomsen , Gang Yuan
IPC分类号： H03F3/45
CPC分类号： H03F3/005 , H03F3/45197 , H03F3/45645 , H03F2203/45404 , H03F2203/45418 , H03F2203/45421 , H03F2203/45424 , H03F2203/45444 , H03F2203/45446 , H03F2203/45528 , H03F2203/45648
摘要： A method of operating an amplifier circuit having a pre-charge phase and a sample/conversion phase includes, during a pre-charge phase, charging first and second capacitors to first and second bias voltages. The first capacitor is coupled to a first input of an amplifier circuit, which has a second input and an output. The second capacitor is coupled to the second input. During a sample/conversion phase, the first input of the amplifier circuit is coupled to an input signal through the first capacitor to level-shift the input signal according to the first bias voltage and the output of the amplifier is coupled to the second input through the second capacitor to level shift a feedback signal according to the second bias voltage.
摘要翻译：操作具有预充电阶段和采样/转换阶段的放大器电路的方法包括在预充电阶段期间将第一和第二电容器充电到第一和第二偏置电压。第一电容器耦合到具有第二输入和输出的放大器电路的第一输入端。第二电容器耦合到第二输入端。在采样/转换阶段期间，放大器电路的第一输入通过第一电容耦合到输入信号，以根据第一偏置电压对输入信号进行电平移位，并且放大器的输出端通过所述第二电容器根据所述第二偏置电压对反馈信号进行电平移位。

4. 发明申请

US20120182071A1 OPERATIONAL AMPLIFIER CIRCUIT 有权
标题翻译：操作放大器电路
公开(公告)号：US20120182071A1
公开(公告)日：2012-07-19
申请号：US13349861
申请日：2012-01-13
申请人： Tatsuya Takei
发明人： Tatsuya Takei
IPC分类号： H03F3/45
CPC分类号： H03F3/45475 , H03F3/45192 , H03F3/4565 , H03F3/45937 , H03F2203/45082 , H03F2203/45406 , H03F2203/45444 , H03F2203/45482
摘要： An operational amplifier circuit may include a fully differential amplifier circuit that has a common mode feedback, the fully differential amplifier circuit performing operational amplification using a common mode base voltage as a center, a common mode detection circuit that detects a common mode output voltage of the fully differential amplifier circuit, a sample and hold circuit that performs sample and hold of an output of the common mode detection circuit, an operational circuit that detects a deviation between the output of the sample and hold circuit and a common mode reference voltage, the operational circuit outputting a voltage corresponding to the detected deviation and the common mode reference voltage, and a switching circuit that selects the common mode reference voltage or an output of the operational circuit to output the common mode reference voltage or the output as the common mode base voltage.
摘要翻译：运算放大器电路可以包括具有共模反馈的全差分放大器电路，全差分放大器电路使用共模基极电压作为中心进行运算放大，共模检测电路检测共模输出电压全差分放大器电路，对共模检测电路的输出进行采样和保持的采样和保持电路，检测采样和保持电路的输出与共模参考电压之间的偏差的运算电路，输出对应于检测到的偏差和共模参考电压的电压的电路，以及选择共模参考电压的开关电路或输出共模参考电压或输出作为共模基极电压的运算电路的输出。

5. 发明授权

US09646715B2 Low-noise low-distortion signal acquisition circuit and method with reduced area utilization 有权
公开(公告)号：US09646715B2
公开(公告)日：2017-05-09
申请号：US14656177
申请日：2015-03-12
申请人： Aeroflex Colorado Springs Inc.
发明人： Alfio Zanchi , Shinichi Hisano
IPC分类号： G11C27/02 , H01L31/02 , H03F1/08 , H03F3/08 , H03F3/45 , H03M1/12
CPC分类号： G11C27/026 , H01L31/02002 , H03F1/08 , H03F1/083 , H03F3/08 , H03F3/087 , H03F3/45076 , H03F3/45475 , H03F2200/129 , H03F2200/156 , H03F2200/45 , H03F2203/45444 , H03F2203/45514 , H03M1/1215
摘要： A sample and hold amplifier includes an input node for receiving an input current signal, a non-linear sampling capacitor circuit having an input coupled to the input node, an operational amplifier having a negative input coupled to an output of the non-linear sampling capacitor circuit, a positive input coupled to ground, and an output for providing a sample and hold voltage signal, and a linear capacitor coupled between the negative input and the output of the operational amplifier. The non-linear sampling capacitor includes a non-linear capacitor coupled between an intermediate node and ground, a first switch coupled between the input and the intermediate node configured to switch according to a first phase signal, and a second switch coupled between the output and the intermediate node configured to switch according to a second phase signal.

6. 发明授权

US08952751B2 Amplifier circuits and methods of amplifying an input signal 有权
标题翻译：放大器电路和放大输入信号的方法
公开(公告)号：US08952751B2
公开(公告)日：2015-02-10
申请号：US13732135
申请日：2012-12-31
申请人： Axel Thomsen , Gang Yuan
发明人： Axel Thomsen , Gang Yuan
IPC分类号： H03F1/02 , H03F3/00 , H03F3/45
CPC分类号： H03F3/005 , H03F3/45197 , H03F3/45645 , H03F2203/45404 , H03F2203/45418 , H03F2203/45421 , H03F2203/45424 , H03F2203/45444 , H03F2203/45446 , H03F2203/45528 , H03F2203/45648
摘要： A method of operating an amplifier circuit having a pre-charge phase and a sample/conversion phase includes, during a pre-charge phase, charging first and second capacitors to first and second bias voltages. The first capacitor is coupled to a first input of an amplifier circuit, which has a second input and an output. The second capacitor is coupled to the second input. During a sample/conversion phase, the first input of the amplifier circuit is coupled to an input signal through the first capacitor to level-shift the input signal according to the first bias voltage and the output of the amplifier is coupled to the second input through the second capacitor to level shift a feedback signal according to the second bias voltage.
摘要翻译：操作具有预充电阶段和采样/转换阶段的放大器电路的方法包括在预充电阶段期间将第一和第二电容器充电到第一和第二偏置电压。第一电容器耦合到具有第二输入和输出的放大器电路的第一输入端。第二电容器耦合到第二输入端。在采样/转换阶段期间，放大器电路的第一输入通过第一电容耦合到输入信号，以根据第一偏置电压对输入信号进行电平移位，并且放大器的输出端通过所述第二电容器根据所述第二偏置电压对反馈信号进行电平移位。

7. 发明授权

US08610465B2 Comparator circuit 失效
标题翻译：比较器电路
公开(公告)号：US08610465B2
公开(公告)日：2013-12-17
申请号：US12993145
申请日：2009-05-25
申请人： Christer Jansson
发明人： Christer Jansson
IPC分类号： H03K5/22
CPC分类号： H03F3/45753 , H03F2203/45292 , H03F2203/45444 , H03F2203/45538 , H03F2203/45634
摘要： A comparator circuit (5) comprising a fully differential main amplifier unit (10, 10b). The main amplifier unit (10, 10b) comprises a control port and is adapted to control a bias current of a first branch of the main amplifier unit (10, 10b) and/or a bias current of a second branch of the main amplifier unit (10, 10b) in response to one or more control voltages supplied to the control port of the main amplifier unit (10, 10b). The comparator circuit (5) comprises circuitry (60) for balancing the voltages at the positive and negative input terminals (12a, 12b) of the main amplifier unit (10, 10b) during a first clock phase of the comparator circuit (5). Furthermore, the comparator circuit (10, 10a) comprises a switched-capacitor accumulator unit with a differential input. The switched-capacitor accumulator unit is operatively connected to the positive and negative output terminals (14a, 14b) of the main amplifier unit (10, 10b) for sampling voltages at the positive and negative output terminals (14a, 14b) of the main amplifier unit (10, 10b) during the first clock phase, and operatively connected to the control port of the main amplifier unit (10, 10b) for supplying said one or more control voltages.
摘要翻译：一种包括全差分主放大器单元（10,10b）的比较器电路（5）。主放大器单元（10,10b）包括控制端口，并且适于控制主放大器单元（10,10b）的第一支路的偏置电流和/或主放大器单元的第二支路的偏置电流（10,10b），响应于提供给主放大器单元（10,10b）的控制端口的一个或多个控制电压。比较器电路（5）包括用于在比较器电路（5）的第一时钟相位期间平衡主放大器单元（10,10b）的正和负输入端（12a，12b）处的电压的电路（60）。此外，比较器电路（10,10a）包括具有差分输入的开关电容器累加器单元。开关电容器蓄电单元可操作地连接到主放大器单元（10,10b）的正输出端和负输出端（14a，14b），用于对主放大器的正负输出端（14a，14b）采样电压单元（10,10b），并且可操作地连接到主放大器单元（10,10b）的控制端口，用于提供所述一个或多个控制电压。

8. 发明申请

US20130154741A1 APPARATUS AND CIRCUIT FOR AMPLIFYING BASEBAND SIGNAL 有权
标题翻译：用于放大基带信号的装置和电路
公开(公告)号：US20130154741A1
公开(公告)日：2013-06-20
申请号：US13715537
申请日：2012-12-14
申请人： Samsung Electronics Co., Ltd.
发明人： Jong-Woo LEE , Si-Bum JUN
IPC分类号： H03F3/45 , H03L7/00
CPC分类号： H03F3/45071 , H03F1/342 , H03F3/195 , H03F3/45179 , H03F3/45475 , H03F3/45654 , H03F3/45977 , H03F2200/294 , H03F2200/336 , H03F2200/405 , H03F2200/451 , H03F2203/45138 , H03F2203/45404 , H03F2203/45421 , H03F2203/45422 , H03F2203/45444 , H03F2203/45512 , H03F2203/45514 , H03F2203/45522 , H03F2203/45526 , H03F2203/45528 , H03F2203/45591 , H03F2203/45594 , H03L7/00
摘要： An operational amplifier circuit is provided. The operational amplifier circuit includes a differential amplifier of a cascade structure and a switched-capacitor type Common-Mode FeedBack (CMFB) circuit. The differential amplifier amplifies a difference between two input signals to output an anode output voltage and a negative output voltage. The switched-capacitor type CMFB circuit averages the anode output voltage and the negative output voltage of the differential amplifier, compares the average voltage with a reference voltage to generate a feedback signal based on a result of the comparison, and provides the feedback signal to the differential amplifier. Therefore, power consumption is reduced and a battery use time of a wireless terminal can be extended. Also, since an operational amplifier gain of each analog filter terminal is not negatively affected, a Direct Current (DC) offset is reduced, thereby improving signal quality.
摘要翻译：提供运算放大器电路。运算放大器电路包括级联结构的差分放大器和开关电容型共模反馈（CMFB）电路。差分放大器放大两个输入信号之间的差，以输出阳极输出电压和负输出电压。开关电容器型CMFB电路对差分放大器的阳极输出电压和负输出电压进行平均，将平均电压与参考电压进行比较，以根据比较结果生成反馈信号，并将反馈信号提供给差分放大器。因此，功耗降低，无线终端的电池使用时间能够延长。此外，由于每个模拟滤波器端子的运算放大器增益不受负面影响，所以减小直流（DC）偏移，从而提高信号质量。

9. 发明授权

US09899974B2 Chopper stabilized amplifier 有权
公开(公告)号：US09899974B2
公开(公告)日：2018-02-20
申请号：US15293675
申请日：2016-10-14
申请人： ROHM CO., LTD.
发明人： Sachito Horiuchi , Naohiro Nomura
IPC分类号： H03F1/02 , H03F3/45 , H03F3/393 , H03F3/00 , H03F1/30 , H03F1/34
CPC分类号： H03F3/45636 , H03F1/02 , H03F1/303 , H03F1/34 , H03F3/005 , H03F3/393 , H03F3/45 , H03F3/45183 , H03F3/45475 , H03F3/45744 , H03F2203/45014 , H03F2203/45026 , H03F2203/45116 , H03F2203/45174 , H03F2203/45444
摘要： A main amplifier generates an output signal SOUT according to a difference between first and second voltages VP and VN. A first gm amplifier is arranged as a differential input stage. A second, fully differential, gm amplifier amplifies a voltage difference between its non-inverting and inverting input terminals, and outputs a differential current signal I3N/I3P via its inverting and non-inverting output terminals. An integrator integrates a differential input current I4P/I4N input via its non-inverting and inverting input terminals, and samples and holds the signal every predetermined period, to generate a differential voltage signal. A first selector is arranged as an upstream stage of the second gm amplifier, and outputs the differential input signal without change or otherwise after swapping. A second selector is arranged as a downstream stage of the second gm amplifier, and outputs the signal I3N/I3P output from the second gm amplifier without change or otherwise after swapping.

10. 发明申请

US20170331432A1 AMPLIFYING CIRCUIT 有权
公开(公告)号：US20170331432A1
公开(公告)日：2017-11-16
申请号：US15657618
申请日：2017-07-24
申请人： SHENZHEN GOODIX TECHNOLOGY CO., LTD.
发明人： Mengwen ZHANG
IPC分类号： H03F1/02 , H03F3/187 , H03F1/30 , H03F1/32
CPC分类号： H03F1/0205 , H03F1/301 , H03F1/32 , H03F3/005 , H03F3/187 , H03F3/45183 , H03F3/45188 , H03F3/45192 , H03F3/45475 , H03F3/45659 , H03F3/45699 , H03F3/45762 , H03F2200/129 , H03F2200/156 , H03F2200/159 , H03F2200/18 , H03F2200/222 , H03F2200/252 , H03F2200/264 , H03F2200/471 , H03F2200/555 , H03F2203/45008 , H03F2203/45012 , H03F2203/45024 , H03F2203/45028 , H03F2203/45054 , H03F2203/45068 , H03F2203/45082 , H03F2203/45112 , H03F2203/45134 , H03F2203/45136 , H03F2203/45171 , H03F2203/45174 , H03F2203/45182 , H03F2203/45188 , H03F2203/45192 , H03F2203/45208 , H03F2203/45244 , H03F2203/45332 , H03F2203/45421 , H03F2203/45434 , H03F2203/45444 , H03F2203/45512 , H03F2203/45514 , H03F2203/45534 , H03F2203/45544 , H03F2203/45546 , H03F2203/45551 , H03F2203/45586 , H03F2203/45588 , H03F2203/45616 , H03F2203/45632 , H03F2203/45642 , H03F2203/45656 , H03F2203/45674 , H03F2203/45676
摘要： An amplifying circuit includes a reference voltage generating circuit, a common-mode voltage conversion circuit, a common-mode negative feedback circuit, and an amplifying sub-circuit. The reference voltage generating circuit generates a first reference voltage, a second reference voltage, and a reference common-mode voltage according to a post-stage common-mode voltage. The common-mode voltage conversion circuit converts the pre-stage output differential signal into a differential input signal according to the reference common-mode voltage. The common-mode negative feedback circuit generates a control voltage to quickly establish a common-mode negative feedback of the amplifying sub-circuit, wherein the first reference voltage and the second reference voltage are used to cancel a baseline signal of the pre-stage output differential signal. The amplifying circuit can eliminate the baseline signal, convert the common-mode voltage and quickly establish the common-mode negative feedback.

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