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1. 发明申请

US20190007013A1 AMPLIFICATION CIRCUIT WITH SPLIT-LENGTH COMPENSATION SCHEME 审中-公开
公开(公告)号：US20190007013A1
公开(公告)日：2019-01-03
申请号：US16021859
申请日：2018-06-28
申请人： SK hynix Inc.
发明人： Jungung Kim
IPC分类号： H03F3/45 , H03F1/08 , H03F3/21
CPC分类号： H03F3/45188 , H03F1/086 , H03F3/211 , H03F3/45192 , H03F3/4565
摘要： An amplification circuit includes: a current source; a first input transistor pair suitable for receiving a positive input voltage and having a split-length gate structure; a second input transistor pair suitable for receiving a negative input voltage and having a split-length gate structure; an enable unit suitable for supplying a current from the current source to each of the first input transistor pair and the second input transistor pair in response to an enable signal; a switching unit suitable for coupling a second split gate node between the second input transistor pair to a compensation capacitor node during an activation section of the enable signal; and a compensation driving unit suitable for compensating and driving a first split gate node between the first input transistor pair at an initial stage of the activation section of the enable signal.

2. 发明授权

US10116269B1 Differential amplifier with extended bandwidth and THD reduction 有权
公开(公告)号：US10116269B1
公开(公告)日：2018-10-30
申请号：US15958984
申请日：2018-04-20
申请人： INPHI CORPORATION
发明人： Leonardo Vera , Carl Pobanz , James Hoffman
IPC分类号： H03F1/32 , H03F1/48 , H03F3/45
CPC分类号： H03F1/3211 , H03F1/42 , H03F1/483 , H03F3/45089 , H03F3/45094 , H03F3/45188 , H03F3/45192 , H03F2200/498 , H03F2203/45316 , H03F2203/45392 , H03F2203/45702
摘要： The present invention is directed to electrical circuits. More specifically, an embodiment of the present invention provides a differential amplifier in cascode configuration. An input transistor is coupled to an output transistor via a peaking inductor. The output transistor is also directly coupled to a degeneration resistor. There are other embodiments as well.

3. 发明授权

US10084422B1 Method and apparatus for providing a variable gain amplifier 有权
公开(公告)号：US10084422B1
公开(公告)日：2018-09-25
申请号：US15371687
申请日：2016-12-07
申请人： Xilinx, Inc.
发明人： Mohamed N. Elzeftawi
IPC分类号： H03F3/45 , H03G3/30 , H03G1/00
CPC分类号： H03F3/45192 , H03F1/3211 , H03F3/193 , H03F2200/451 , H03F2203/45018 , H03F2203/45026 , H03F2203/45366 , H03G1/0023 , H03G1/0029
摘要： An integrated circuit and method for providing a variable gain amplifier are disclosed. One embodiment of the a variable gain amplifier comprises at least one load, a cascode circuit coupled to the load, a folded-gilbert stage, coupled to the cascode circuit, the folded-gilbert stage comprising a main differential pair of transistors and an internal pair of transistors, and a digital to analog converter, coupled to the folded-gilbert stage, for steering currents between the main differential pair of transistors and the internal pair of transistors to change a gain of the variable gain amplifier.

4. 发明申请

US20180176683A1 Direct Current Mode Digital-to-Analog Converter to Class D Amplifier 审中-公开
公开(公告)号：US20180176683A1
公开(公告)日：2018-06-21
申请号：US15897177
申请日：2018-02-15
申请人： TEXAS INSTRUMENTS INCORPORATED
发明人： Lars Risbo , Ryan Erik Lind , Jasjot Singh Chadha
IPC分类号： H04R3/02 , H03F3/185 , H03F3/217
CPC分类号： H04R3/02 , H03F3/185 , H03F3/2173 , H03F3/3022 , H03F3/45192 , H03F2200/03 , H03F2200/351 , H03F2200/411 , H04R3/00
摘要： A system includes a class D amplifier and a current steering digital-to-analog converter (DAC) directly connected to the class D amplifier. The system also includes a common mode servo circuit coupled to a node interconnecting the current steering DAC to the class D amplifier. The common servo circuit amplifies a difference between a common mode signal determined from the node and a reference voltage and generates a feedback current to the node based on the amplified difference. A feed-forward common-mode compensation circuit is included to reduce an alternating current (AC) ripple from the class D amplifier. The feed-forward common-mode compensation circuit includes first and second resistors coupled to respective outputs of the class D amplifier. A current mirror is coupled to the first and second resistors and is configured to sink a current from the node to ground that approximates a common mode feedback current of the class D amplifier.

5. 发明授权

US09825601B2 Differential two-stage amplifier and operation method thereof 有权
公开(公告)号：US09825601B2
公开(公告)日：2017-11-21
申请号：US14684691
申请日：2015-04-13
申请人： Winbond Electronics Corp.
发明人： Tsung-Fu Tsai , Herming Chiueh
IPC分类号： H03F3/45
CPC分类号： H03F3/45192 , H03F3/45475 , H03F3/4565 , H03F2203/45112 , H03F2203/45134 , H03F2203/45284 , H03F2203/45286
摘要： A differential two-stage amplifier is provided. The differential two-stage amplifier includes an input circuit, a bias circuit, a common mode feedback circuit, a first stage amplifier, a second stage amplifier and a current compensation circuit. The input circuit receives an input current. The bias circuit provides a bias current. The first stage amplifier is coupled to the input circuit and the second stage amplifier. The common mode feedback circuit is coupled to the second stage amplifier and adjusts a common mode feedback current according to a common mode voltage, wherein the input current is made up of the bias current and the common mode feedback current. The current compensation circuit provides a compensation current, wherein when a temperature of the differential two-stage amplifier is greater than a predetermined temperature, the compensation current is input to the input circuit.

6. 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.

7. 发明授权

US09755680B2 Circuits for field-programmable receiver front ends 有权
公开(公告)号：US09755680B2
公开(公告)日：2017-09-05
申请号：US15276308
申请日：2016-09-26
申请人： Jianxun Zhu , Peter R. Kinget
发明人： Jianxun Zhu , Peter R. Kinget
IPC分类号： G06F3/033 , H04B1/16 , H03F3/45 , H03F3/19
CPC分类号： H04B1/1638 , H03F3/19 , H03F3/195 , H03F3/265 , H03F3/45179 , H03F3/45192 , H03F3/45475 , H03F2200/294 , H03F2200/336 , H03F2200/451 , H03F2203/45288 , H03F2203/45512 , H03F2203/45526
摘要： Circuits for field-programmable receiver front ends are provided. These front ends can include a field programmable common source low noise transconductance amplifier (LNTA), a field programmable common gate LNTA, first and second four-phase I/Q mixers, first, second, third, and fourth transimpedance amplifiers, an I-path complex combiner, and a Q-path complex combiner. Transconductance cells in each of the field programmable common source LNTA and field programmable common gate LNTA can be programmed to operate in one of a class-AB mode, a class-C mode, and an OFF mode.

8. 发明申请

US20170077881A1 Chopper Stabilized Amplifier With Synchronous Switched Capacitor Noise Filtering 有权
标题翻译：斩波稳定放大器与同步开关电容噪声滤波
公开(公告)号：US20170077881A1
公开(公告)日：2017-03-16
申请号：US15276002
申请日：2016-09-26
申请人： IXYS Corporation
发明人： Eric Blom
IPC分类号： H03F3/393 , H03F3/45 , H03F1/26
CPC分类号： H03F3/393 , H03F1/26 , H03F3/45192 , H03F3/45475 , H03F2200/171 , H03F2200/271 , H03F2200/411 , H03F2200/555 , H03F2203/45514 , H03H19/004
摘要： A chopper stabilzed amplifier with synchronous switched capacitor noise filtering is disclosed. In an exemplary embodiment, an apparatus includes a chopper amplifier having an input that receives an input signal and an output that outputs an amplified signal. The chopper amplifier includes an input chopping circuit and an output chopping circuit, where the input and output chopping circuits operate in response to a chop clock. The apparatus also includes a switched capacitor filter having an input that receives the amplified signal and an output that outputs a filtered signal. The switched capacitor filter operates in response to a filter clock. The apparatus also includes a filter timing adjuster that receives a reference voltage and adjusts a phase of the filter clock with respect to the chop clock to reduce chopper noise on that reference voltage.
摘要翻译：公开了具有同步开关电容噪声滤波的斩波稳定放大器。在示例性实施例中，一种装置包括具有接收输入信号的输入和输出放大信号的输出的斩波放大器。斩波放大器包括输入斩波电路和输出斩波电路，其中输入和输出斩波电路响应于斩波时钟而工作。该装置还包括具有接收放大信号的输入端和输出滤波信号的输出的开关电容滤波器。开关电容滤波器响应于滤波器时钟而工作。该装置还包括滤波器定时调节器，其接收参考电压并相对于斩波时钟调节滤波器时钟的相位，以减小该参考电压的斩波噪声。

9. 发明授权

US09584079B2 Operational amplifier 有权
标题翻译：运算放大器
公开(公告)号：US09584079B2
公开(公告)日：2017-02-28
申请号：US14648775
申请日：2013-12-03
申请人： NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
发明人： Shinichi Ouchi
IPC分类号： H03F3/393 , H03F3/45 , H03F3/00
CPC分类号： H03F3/393 , H03F3/005 , H03F3/45179 , H03F3/45192 , H03F3/45475 , H03F2200/168 , H03F2200/249 , H03F2200/271 , H03F2200/405 , H03F2203/45366 , H03F2203/45512 , H03F2203/45544 , H03F2203/7212
摘要： There is provided an operational amplifier which is operable as well when an operating voltage decreases without creating a range where a circuit would not operate or reducing circuit gain. High-pass filters 102-105 provide output signals therefrom to bias-set input nodes of differential amplifiers Gm1-Gm4 to a potential within a common-mode range in which the respective differential amplifiers Gm1-Gm4 are operable. In this manner, the respective differential amplifiers Gm1-Gm4 can be operated effectively regardless of the possible decrease in a supply voltage, enabling normal amplifying operation. In addition, reduction in gain due to the reduced operational voltage is avoided. Therefore, it is preferably applicable to the application where digital and analog circuits are loaded together on the same IC chip. When a high-pass filter is required at each input side of two- or more-stage differential amplifiers, a phase compensation method utilizing multiple paths is provided for a lower range of a phase margin created at the low frequency side, enabling normal amplitude operation.
摘要翻译：提供了一种运算放大器，当工作电压降低而不产生电路不工作的范围或降低电路增益时，该放大器也可操作。高通滤波器102-105将差分放大器Gm1-Gm4的偏置设置输入节点的输出信号提供给各个差分放大器Gm1-Gm4可操作的共模范围内的电位。以这种方式，可以有效地操作各个差分放大器Gm1-Gm4，而不管可能的电源电压降低，从而能够进行正常的放大操作。此外，避免了由于降低的操作电压而导致的增益的降低。因此，优选地适用于同一IC芯片上数字和模拟电路一起加载的应用。当在两级或更多级差分放大器的每个输入侧需要高通滤波器时，为低频侧产生的相位余量的较低范围提供利用多路径的相位补偿方法，使得能够进行正常幅度运算。

10. 发明授权

US09419587B1 Method and apparatus to reconfigure a filter 有权
标题翻译：重新配置过滤器的方法和装置
公开(公告)号：US09419587B1
公开(公告)日：2016-08-16
申请号：US14731178
申请日：2015-06-04
申请人： Marvell International Ltd.
发明人： Zhigang Xu , Junxiong Deng , Taotao Yan
IPC分类号： H03K5/00 , H03H21/00 , H04B1/04 , H03H11/04 , H03H11/30 , H03D7/14 , H03H11/28 , H03H11/40
CPC分类号： H03H11/28 , H03D7/1466 , H03D7/1491 , H03D7/165 , H03F1/3211 , H03F3/45188 , H03F3/45192 , H03F3/45475 , H03F3/72 , H03F2200/111 , H03F2203/7209 , H03H11/0422 , H03H11/0472 , H03H11/40 , H03H2210/017
摘要： Aspects of the disclosure provide a circuit having a filter circuit and a controller. The filter circuit drives a load circuit having different input impedances under different operation conditions. The filter circuit is configured to have a first output circuit coupled with a first resistor and a second output circuit coupled with a second resistor. The controller is configured to generate control signals to select one of the first output circuit and the second output circuit based on an operation condition of the load circuit.
摘要翻译：本公开的方面提供了具有滤波器电路和控制器的电路。滤波电路在不同的工作条件下驱动具有不同输入阻抗的负载电路。滤波器电路被配置为具有与第一电阻器耦合的第一输出电路和与第二电阻器耦合的第二输出电路。控制器被配置为基于负载电路的操作条件产生控制信号以选择第一输出电路和第二输出电路中的一个。

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