专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US09912309B1 Filter-less chopping for offset cancellation 有权
公开(公告)号：US09912309B1
公开(公告)日：2018-03-06
申请号：US15165809
申请日：2016-05-26
申请人： Marvell Israel (M.I.S.L.) Ltd.
发明人： Reuven Ecker , Shimon Avitan
IPC分类号： H03F1/02 , H03F3/393 , H03F1/34 , H03F3/45
CPC分类号： H03F3/393 , H03F3/45183 , H03F3/45475 , H03F3/45753 , H03F3/45775 , H03F3/45977 , H03F3/72 , H03F2200/271 , H03F2200/384 , H03F2203/45212 , H03F2203/45352 , H03F2203/45371 , H03F2203/45396 , H03F2203/7236
摘要： Aspects of the disclosure provide an amplifier system and a method for dynamically cancelling an offset voltage. The amplifier system includes a chopper amplifier system that includes a differential amplifier with an offset calibration circuit. The chopper amplifier system is configured to generate an output signal including voltage variations indicating an offset voltage of the differential amplifier. The amplifier system also includes a feedback circuit configured to determine a polarity of the offset voltage of the differential amplifier based on the output signal, and to transmit a control signal to the offset calibration circuit to reduce the offset voltage of the differential amplifier.

2. 发明授权

US09874896B2 Voltage-current converter, and corresponding device and method 有权
公开(公告)号：US09874896B2
公开(公告)日：2018-01-23
申请号：US15226568
申请日：2016-08-02
申请人： STMICROELECTRONICS S.R.L.
发明人： Edoardo Botti
IPC分类号： H03F3/183 , G05F3/26 , H03F3/217
CPC分类号： G05F3/267 , H02M2001/0003 , H03D7/1491 , H03F1/3211 , H03F3/183 , H03F3/185 , H03F3/217 , H03F3/393 , H03F3/45183 , H03F3/45197 , H03F3/45775 , H03F2200/03 , H03F2200/351 , H03F2203/45356 , H03F2203/45392
摘要： A voltage-current converter includes a first input stage and a second input stage with a first transistor and a second transistor driven by the first input stage and by the second input stage, respectively. First and second current generators are coupled to current lines of the first transistor and of the second transistor. At least one resistor couples the current lines of the first transistor and of the second transistor, where the ends of the aforesaid resistor are coupled to feedback terminals of the input stages so that an input voltage applied between voltage input terminals of the input stages is converted into a current on respective current output terminals of the converter. The converter includes switching circuits for coupling the first and second current generators alternately to the current line of the first transistor and to the current line of the second transistor.

3. 发明授权

US07504882B2 Differential amplifier circuit and semiconductor device 失效
标题翻译：差分放大电路和半导体器件
公开(公告)号：US07504882B2
公开(公告)日：2009-03-17
申请号：US11510623
申请日：2006-08-28
申请人： Hirofumi Saito
发明人： Hirofumi Saito
IPC分类号： H03F3/45
CPC分类号： G11C7/067 , G11C7/08 , H03F3/3022 , H03F3/393 , H03F3/45192 , H03F3/45475 , H03F3/45775 , H03F2203/45136 , H03F2203/45212 , H03F2203/45512 , H03F2203/45548 , H03F2203/45588 , H03F2203/45616 , H03F2203/45681 , H03F2203/45726
摘要： A differential amplifier circuit in which an input offset voltage is very small. The differential amplifier circuit includes an input-stage differential amplifier section and a cascode-connected single-ended output section connected to the input-stage differential amplifier section. The input-stage differential amplifier section has a folded-cascode-connection. An inverted signal and non-inverted signal on the input side and output side, respectively, of the input-stage differential amplifier section are switched alternatingly in time-shared fashion by switches that are operated by two chopping clock signals of opposite phase.
摘要翻译：其中输入失调电压非常小的差分放大器电路。差分放大器电路包括输入级差分放大器部分和连接到输入级差分放大器部分的共源共栅型单端输出部分。输入级差分放大器部分具有折叠共源共栅连接。输入级差分放大器部分的输入侧和输出侧的反相信号和非反相信号通过由相反相位的两个斩波时钟信号操作的开关以时间共享的方式交替地切换。

4. 发明授权

US07408402B2 Operational amplifier with less offset voltage 有权
标题翻译：具有较小失调电压的运算放大器
公开(公告)号：US07408402B2
公开(公告)日：2008-08-05
申请号：US11432526
申请日：2006-05-12
申请人： Kouichi Nishimura
发明人： Kouichi Nishimura
IPC分类号： H03F1/02
CPC分类号： H03F3/45219 , H03F3/3028 , H03F3/45775
摘要： An operational amplifier includes a differential pair section; a load section configured to function as active load of the differential pair section; and a switch section configured to switch supply of a differential input signal to the differential pair section and to switch connection of outputs of the differential pair section to the load section. The switch section is operated to cancel an offset voltage of the operation amplifier.
摘要翻译：运算放大器包括差分对部分; 配置为用作所述差动对部分的有效负载的负载部分; 以及开关部，被配置为将差分输入信号的电源切换到差分对部分，并且将差分对部分的输出端连接到负载部分。操作开关部分以消除运算放大器的偏移电压。

5. 发明授权

US07116161B2 Differential amplifier circuit and drive circuit of liquid crystal display unit using the same 失效
标题翻译：差分放大电路和驱动电路采用液晶显示单元
公开(公告)号：US07116161B2
公开(公告)日：2006-10-03
申请号：US10939369
申请日：2004-09-14
申请人： Yoshihiko Nakahira
发明人： Yoshihiko Nakahira
IPC分类号： H03F1/02
CPC分类号： H03F3/45775 , H03F3/4521 , H03F2203/45724
摘要： Even when an input is small in a current supply capacity, a differential amplifier circuit capable of outputting a high accurate voltage with an offset corrected can be obtained. In the differential amplifier having first and second input terminals and an output terminal, a control is made for switching between a first state wherein a first input terminal is taken as a non-inverting input terminal, and a second input terminal is taken as an inverting input terminal, and a second state wherein the first input terminal is taken as an inverting input terminal and the second input terminal is taken as a non-inverting input terminal, and further, a capacity element, one end of which is connected to a predetermine power source terminal, is provided, and moreover, a control is made such that the first input terminal is supplied with an input voltage, and the other end of the capacity is connected to the second input terminal and output terminal in the first state, and the first input terminal is connected to the output terminal, and the other end of the capacity is connected to the second input terminal in the second state. In this way, an offset detecting operation is performed in the first state, and an offset correcting operation is performed in the second state without the input voltage connected to the capacity.
摘要翻译：即使当输入电流容量小时，也可以获得能够输出偏移校正的高精度电压的差分放大电路。在具有第一和第二输入端子和输出端子的差分放大器中，进行控制以将第一输入端子作为非反相输入端子的第一状态和第二输入端子作为反相输入端子和第二状态，其中将第一输入端子作为反相输入端子，将第二输入端子作为非反相输入端子，另外，电容元件的一端连接到预定值电源端子，此外，进行控制，使得向第一输入端子提供输入电压，并且将容量的另一端连接到处于第一状态的第二输入端子和输出端子，以及第一输入端子连接到输出端子，另一端在第二状态下连接到第二输入端子。以这种方式，在第一状态下执行偏移检测操作，并且在第二状态下执行偏移校正操作，而没有连接到容量的输入电压。

6. 发明申请

US20050212564A1 AN IMPROVED RECEIVER HAVING FULL SIGNAL PATH DIFFERENTIAL OFFSET CANCELLATION CAPABILITIES 失效
标题翻译：具有完整信号路径的改进接收器差分偏移消除能力
公开(公告)号：US20050212564A1
公开(公告)日：2005-09-29
申请号：US10906988
申请日：2005-03-15
申请人： Bertrand Gabillard , Philippe Hauviller , Alexandre Maltere , Christopher Ro
发明人： Bertrand Gabillard , Philippe Hauviller , Alexandre Maltere , Christopher Ro
IPC分类号： G11C27/02 , H03F1/02 , H03F3/45
CPC分类号： H03F3/45775 , G11C27/026
摘要： There is described an improved receiver which first comprises an analog input amplifier a sample and hold differential circuit and two stages of differential comparators that are connected in series, wherein the first stage consists of two comparators and the second stage of one comparator. By properly activating the switches with signals generated by a dedicated control logic, the input differential signal is sampled in the sample and hold circuit to generate first and second differential signals. The first differential signal holds a first state and the second differential signal propagates the second state. As result, the signal output by the second comparator stage reflects the differential offset minus the offset compensation.
摘要翻译：描述了一种改进的接收机，其首先包括模拟输入放大器，采样保持差分电路和串联连接的两级差分比较器，其中第一级由两个比较器和一个比较器的第二级组成。通过用专用控制逻辑产生的信号正确激活开关，输入差分信号在取样和保持电路中被采样，以产生第一和第二差分信号。第一差分信号保持第一状态，第二差分信号传播第二状态。结果，由第二比较器级输出的信号反映差分偏移减去偏移补偿。

7. 发明申请

US20020039096A1 Driving apparatus and method of liquid crystal display apparatus 失效
标题翻译：液晶显示装置的驱动装置及方法
公开(公告)号：US20020039096A1
公开(公告)日：2002-04-04
申请号：US09955118
申请日：2001-09-19
发明人： Masafumi Katsutani
IPC分类号： G09G005/00
CPC分类号： H03F3/45775 , G09G3/3614 , G09G3/3688
摘要： A driving apparatus of liquid crystal display apparatus of the present invention has a changeover control circuit for controlling each switching of the inputs and outputs of first and second amplifier circuits. In the changeover control circuit, an offset voltage applied to a pixel by the first and second amplifier circuits is changed in its polarity for every predetermined number of frames in accordance with a switch changeover signal for operational amplifier and an alternation switch changeover signal input and the offset voltage is canceled by frames whose number is twice as many as the predetermined number of frames. This allows to cancel the offset voltage by the frames and to avoid that the display unevenness is discernible by human eyes, thereby ensuring to provide driving apparatus and driving method of liquid crystal display apparatus that can carry out the display with high quality.
摘要翻译：本发明的液晶显示装置的驱动装置具有用于控制第一和第二放大器电路的输入和输出的每个切换的转换控制电路。在切换控制电路中，根据用于运算放大器的切换切换信号和交替切换切换信号输入，通过第一和第二放大器电路施加到像素的偏移电压根据每个预定数量的帧而改变其极性，并且偏移电压被数量是预定帧数的两倍的帧所抵消。这允许通过框架消除偏移电压，并且避免人眼可辨别显示不均匀，从而确保提供可以以高质量执行显示的液晶显示装置的驱动装置和驱动方法。

8. 发明授权

US5334944A Differential amplifier circuit for enhancing small voltage signals 失效
标题翻译：用于增强小电压信号的差分放大器电路
公开(公告)号：US5334944A
公开(公告)日：1994-08-02
申请号：US168399
申请日：1993-12-17
申请人： Noriyuki Hirakata
发明人： Noriyuki Hirakata
IPC分类号： H03F3/45 , H03F15/00 , H03F1/02
CPC分类号： H03F3/45968 , H03F3/45479 , H03F3/45775 , H03F2200/81
摘要： A differential amplifier circuit suitable for amplifying a faint signal, such as the output of a magnetic sensor including a Hall element. The differential amplifier circuit includes switching units which are provided at the input and output terminals of a differential amplifier to switch the polarity of the input and output signals, and low pass filters which are provided at the output terminals to remove the switching frequency component from the output signal, thus working as an ideal amplifier with no offset voltage. Furthermore, by alternating the polarity of driving current of the Hall element for inverting the polarity of the input signal of the differential amplifier, an error voltage of the Hall element caused by location error of the output electrodes and the voltage drop across them can be eliminated at the same time.
摘要翻译：一种适用于放大微弱信号的差分放大电路，例如包括霍尔元件的磁传感器的输出。差分放大电路包括设置在差分放大器的输入和输出端的开关单元，用于切换输入和输出信号的极性，以及设置在输出端的低通滤波器，以从开关频率分量输出信号，从而作为无偏移电压的理想放大器。此外，通过交替霍尔元件的驱动电流的极性以反转差分放大器的输入信号的极性，可以消除由输出电极的位置误差引起的霍尔元件的误差电压和它们两端的电压降与此同时。

9. 发明授权

US4138649A Amplifier system 失效
标题翻译：放大器系统
公开(公告)号：US4138649A
公开(公告)日：1979-02-06
申请号：US781151
申请日：1977-03-25
申请人： Gregory L. Schaffer
发明人： Gregory L. Schaffer
IPC分类号： H03F1/30 , H03F3/45 , H03F1/02
CPC分类号： H03F3/387 , H03F1/303 , H03F3/45775 , H03F3/45968 , H03F2200/81
摘要： A low-level dc amplifier includes a first amplification stage having a pair of direct coupled inputs and a pair of outputs direct coupled to the input side of a second amplifier. A first double-pole, double-throw electronic switch interchanges the two first stage inputs synchronously with a second such switch which interchanges the two first stage outputs. The switches produce at the input of the second amplifier a signal which averages out the first stage's equivalent offset signal. A clock drives the two switches at a preselected clocking frequency. The two clock-driven switches effectively cancel out low frequency (1/f) noise. A filter at the output side of the second amplification stage removes higher frequency noise including clock frequency noise.
摘要翻译：低电平直流放大器包括具有一对直接耦合输入的第一放大级和直接耦合到第二放大器的输入侧的一对输出。第一个双极双掷电子开关与两个第一级输出交换的第二个这样的开关同步地交换两个第一级输入。这些开关在第二放大器的输入处产生将第一级的等效偏移信号平均化的信号。时钟以预选的时钟频率驱动两个开关。两个时钟驱动开关有效地消除了低频（1 / f）噪声。在第二放大级的输出侧的滤波器去除包括时钟频率噪声的较高频率噪声。

10. 发明授权

US09941852B1 Operation amplifiers with offset cancellation 有权
公开(公告)号：US09941852B1
公开(公告)日：2018-04-10
申请号：US15278934
申请日：2016-09-28
申请人： FREESCALE SEMICONDUCTOR, INC.
发明人： Firas N. Abughazaleh
IPC分类号： H03F3/45 , H03G1/00
CPC分类号： H03G1/0088 , H03F3/45183 , H03F3/45192 , H03F3/45766 , H03F3/45775 , H03F2203/45044 , H03F2203/45074 , H03F2203/45288 , H03F2203/45354 , H03F2203/45368 , H03F2203/45396 , H03G1/0029
摘要： A semiconductor device includes an operational transconductance amplifier (OTA) with a matched pair of transistors including a first transistor and a second transistor, and configuration units that include a first set of switches, a second set of switches, and an input transistor. Gain adjustment circuitry is coupled to adjust gain of the OTA. Measurement circuitry is coupled to measure offset in the OTA. Control logic is configured to operate the first and second sets of switches to couple input transistors of a first group of the configuration units to the first transistor of the matched pair of transistors, and to couple input transistors of a remaining group of the configuration units to the second transistor of the matched pair of transistors. Settings of the first and second sets of switches are selected to minimize the offset.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式