公开(公告)号：US07262659B2

公开(公告)日：2007-08-28

申请号：US11559195

申请日：2006-11-13

申请人： Mario Caresosa ,  Guangming Yin

发明人： Mario Caresosa ,  Guangming Yin

IPC分类号： H03F3/45

CPC分类号： H03F3/4569 ,  H03F3/45197 ,  H03F3/45744 ,  H03F2200/78 ,  H03F2203/45074 ,  H03F2203/45086 ,  H03F2203/45482 ,  H03F2203/45486 ,  H03G1/0088 ,  H03G3/3036 ,  H03G3/3052

摘要： A method and apparatus for adaptively controlling a variable gain amplifier (VGA). The operation of the VGA is separated into a low gain mode and a high gain mode and the mode in which the VGA is currently operating in is adaptively sensed. A threshold voltage is compared to a control voltage of the VGA; if the VGA is currently operating in the low gain mode and the control voltage is higher than the threshold voltage, the VGA is switched from the low gain mode to the high gain mode; and if the VGA is currently operating in the high gain mode and the control voltage is lower than the threshold voltage, the VGA is switched from the high gain mode to the low gain mode.

摘要翻译： 一种用于自适应地控制可变增益放大器（VGA）的方法和装置。 VGA的操作被分为低增益模式和高增益模式，并且自适应地感测VGA当前正在操作的模式。 将门限电压与VGA的控制电压进行比较; 如果VGA当前处于低增益模式并且控制电压高于阈值电压，则VGA从低增益模式切换到高增益模式; 如果VGA当前处于高增益模式并且控制电压低于阈值电压，则VGA从高增益模式切换到低增益模式。

公开(公告)号：US20060028270A1

公开(公告)日：2006-02-09

申请号：US11239927

申请日：2005-09-29

申请人： Mario Caresosa ,  Guangming Yin

发明人： Mario Caresosa ,  Guangming Yin

IPC分类号： H03G3/20

CPC分类号： H03F3/4569 ,  H03F3/45197 ,  H03F3/45744 ,  H03F2200/78 ,  H03F2203/45074 ,  H03F2203/45086 ,  H03F2203/45482 ,  H03F2203/45486 ,  H03G1/0088 ,  H03G3/3036 ,  H03G3/3052

摘要： A method and apparatus for adaptively controlling a variable gain amplifier (VGA). The operation of the VGA is separated into a low gain mode and a high gain mode and the mode in which the VGA is currently operating in is adaptively sensed. A threshold voltage is compared to a control voltage of the VGA; if the VGA is currently operating in the low gain mode and the control voltage is higher than the threshold voltage, the VGA is switched from the low gain mode to the high gain mode; and if the VGA is currently operating in the high gain mode and the control voltage is lower than the threshold voltage, the VGA is switched from the high gain mode to the low gain mode.

公开(公告)号：US20030222716A1

公开(公告)日：2003-12-04

申请号：US10443104

申请日：2003-05-22

申请人： FUJITSU LIMITED

发明人： Tomoyuki Kumeta ,  Yoshihiro Kizaki

IPC分类号： H03F003/45

CPC分类号： H03F3/45744 ,  H03F3/45197 ,  H03F2203/45458 ,  H03F2203/45471 ,  H03F2203/45482 ,  H03F2203/45494 ,  H03F2203/45496 ,  H03F2203/45648 ,  H03G1/0023

摘要： In an operational transconductance amplifier (OTA), resistors are bridge-connected to source terminals of MOSFETs that form a differential pair of the OTA. Capacitors are connected in parallel between the resistors in order to remove a DC signal component. The C-R circuit forms a high pass filter in order to intercept the DC component. Accordingly, even if there is a difference in transistor characteristic between the MOSFETs, a DC offset voltage does not appear in differential output terminals of the OTA and an output error can be eliminated. When the OTA is used in an AGC amplifier, an output dynamic range of the AGC amplifier can be made wide owing to the removal of the DC offset voltage.

摘要翻译： 在运算跨导放大器（OTA）中，电阻与MOSFET的源极端子桥接，形成OTA的差分对。 电容器在电阻之间并联连接，以便去除直流信号分量。 C-R电路形成高通滤波器以截取直流分量。 因此，即使MOSFET之间的晶体管特性存在差异，在OTA的差分输出端子中也不会出现DC偏移电压，能够消除输出误差。 当在AGC放大器中使用OTA时，由于去除了DC偏移电压，可以使AGC放大器的输出动态范围变宽。

公开(公告)号：US08471636B2

公开(公告)日：2013-06-25

申请号：US13414145

申请日：2012-03-07

申请人： Jimmy Fort ,  Thierry Soude ,  Michel Cuenca ,  Florent Garcia ,  Franck Strazzieri

发明人： Jimmy Fort ,  Thierry Soude ,  Michel Cuenca ,  Florent Garcia ,  Franck Strazzieri

IPC分类号： H03F3/45

CPC分类号： H03F3/45179 ,  G05F3/245 ,  H03F3/45632 ,  H03F2200/447 ,  H03F2203/45101 ,  H03F2203/45482

摘要： A bias current is generated for an unbalanced differential pair that is proportional to the transconductance gain of the differential pair. When the transconductance gain varies (e.g., due to temperature variations), the bias current varies in proportion thereby maintaining a constant offset voltage. In some implementations, a voltage to current converter circuit generates the bias current from a constant reference voltage that is independent of temperature and voltage supply variations (e.g., a bandgap reference voltage).

摘要翻译： 对于与差分对的跨导增益成比例的不平衡差分对产生偏置电流。 当跨导增益变化（例如，由于温度变化）时，偏置电流按比例变化，从而保持恒定的偏移电压。 在一些实施方式中，电压 - 电流转换器电路从与温度和电压供应变化（例如，带隙参考电压）无关的恒定参考电压产生偏置电流。

公开(公告)号：US20120229214A1

公开(公告)日：2012-09-13

申请号：US13402907

申请日：2012-02-23

申请人： Sunil Kasanyal

发明人： Sunil Kasanyal

IPC分类号： H03F3/45

CPC分类号： H03F3/45192 ,  H03F3/45632 ,  H03F2200/408 ,  H03F2200/516 ,  H03F2203/45101 ,  H03F2203/45244 ,  H03F2203/45482 ,  H03F2203/45652 ,  H03F2203/45682 ,  H03F2203/45702 ,  H03K5/003 ,  H04L25/0292

摘要： A differential amplifier circuit comprises a differential pre-amplifying stage which is designed to allow an input signal with a first common mode voltage range, and to generate an output which has a narrower common mode voltage variation. This pre-amplifier stage is designed to accept a large common mode input voltage and to process the signal so that it can be amplified by a main amplifying stage which is designed to allow an input signal with a smaller common mode voltage range.

摘要翻译： 差分放大器电路包括差分预放大级，其被设计为允许具有第一共模电压范围的输入信号，并且产生具有较窄共模电压变化的输出。 该前置放大器级被设计为接受大的共模输入电压并处理信号，使得其可以被主放大级放大，该主放大级被设计为允许具有较小共模电压范围的输入信号。

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 。

公开(公告)号：US07737774B2

公开(公告)日：2010-06-15

申请号：US12097722

申请日：2006-12-12

申请人： François Bore ,  Sandrine Bruel

发明人： François Bore ,  Sandrine Bruel

IPC分类号： H03F1/02

CPC分类号： H03F3/45748 ,  H03F3/456 ,  H03F2203/45212 ,  H03F2203/45352 ,  H03F2203/45482 ,  H03F2203/45504 ,  H03F2203/45512 ,  H03F2203/45514 ,  H03M1/445

摘要： The invention relates to analog integrated electronic circuits using differential pairs. The proposal is for a method of automatic correction of offset voltage. The inputs (V1, V2) of the differential circuit are short circuited during a calibration phase distinct from the normal usage phase. A capacitor is charged through the difference of the output currents of the branches of the differential pair in this phase. The voltage at the terminals of the capacitor is compared with at least one threshold. During the normal usage phase following the calibration phase, the result of the comparison is kept in memory. In the normal usage phase, a correction is applied depending on the result kept in memory to a current source of a follower stage upstream of the differential pair.

摘要翻译： 本发明涉及使用差分对的模拟集成电子电路。 该建议是针对偏移电压进行自动校正的方法。 在与正常使用阶段不同的校准阶段，差分电路的输入（V1，V2）短路。 在该阶段，通过差分对的分支的输出电流的差异对电容器进行充电。 将电容器端子处的电压与至少一个阈值进行比较。 在校准阶段之后的正常使用阶段，将比较结果保存在存储器中。 在正常使用阶段，根据保存在存储器中的结果对差分对上游的跟随器级的电流源进行校正。

公开(公告)号：US20090295479A1

公开(公告)日：2009-12-03

申请号：US12437948

申请日：2009-05-08

申请人： Souji SUNAIRI

发明人： Souji SUNAIRI

IPC分类号： H03F3/45

CPC分类号： H03F3/45183 ,  H03F3/45475 ,  H03F3/4565 ,  H03F3/45928 ,  H03F2203/45082 ,  H03F2203/45101 ,  H03F2203/45418 ,  H03F2203/45424 ,  H03F2203/45482 ,  H03F2203/45681

摘要： An amplifier includes a signal amplification part that outputs an output signal obtained by amplifying an input signal and a common mode voltage VCM of the output signal, and a common mode feedback part that outputs a signal according to a difference between the common mode voltage VCM and a reference potential Vref as a regulation signal SREG. The regulation signal SREG from the common mode feedback part is fed back to a current source of the signal amplification part and a current source of the common mode feedback part.

摘要翻译： 放大器包括：信号放大部，其输出通过放大输出信号的输入信号和共模电压VCM得到的输出信号;以及共模反馈部，其根据共模电压VCM和 参考电位Vref作为调节信号SREG。 来自共模反馈部的调节信号SREG被反馈到信号放大部的电流源和共模反馈部的电流源。

公开(公告)号：US20090224805A1

公开(公告)日：2009-09-10

申请号：US12097722

申请日：2006-12-12

申请人： Francois Bore ,  Sandrine Bruel

发明人： Francois Bore ,  Sandrine Bruel

IPC分类号： H03K5/22

CPC分类号： H03F3/45748 ,  H03F3/456 ,  H03F2203/45212 ,  H03F2203/45352 ,  H03F2203/45482 ,  H03F2203/45504 ,  H03F2203/45512 ,  H03F2203/45514 ,  H03M1/445

摘要： The invention relates to analog integrated electronic circuits using differential pairs. The proposal is for a method of automatic correction of offset voltage. The inputs (V1, V2) of the differential circuit are short circuited during a calibration phase distinct from the normal usage phase. A capacitor is charged through the difference of the output currents of the branches of the differential pair in this phase. The voltage at the terminals of the capacitor is compared with at least one threshold. During the normal usage phase following the calibration phase, the result of the comparison is kept in memory. In the normal usage phase, a correction is applied depending on the result kept in memory to a current source of a follower stage upstream of the differential pair.

摘要翻译： 本发明涉及使用差分对的模拟集成电子电路。 该建议是针对偏移电压进行自动校正的方法。 在与正常使用阶段不同的校准阶段，差分电路的输入（V1，V2）短路。 在该阶段，通过差分对的分支的输出电流的差异对电容器进行充电。 将电容器端子处的电压与至少一个阈值进行比较。 在校准阶段之后的正常使用阶段，将比较结果保存在存储器中。 在正常使用阶段，根据保存在存储器中的结果对差分对上游的跟随器级的电流源进行校正。

公开(公告)号：US20080197928A1

公开(公告)日：2008-08-21

申请号：US11831410

申请日：2007-07-31

申请人： Minh V. Watson

发明人： Minh V. Watson

IPC分类号： H03F3/45

CPC分类号： H03F3/45475 ,  H03F3/45748 ,  H03F3/45973 ,  H03F2203/45082 ,  H03F2203/45101 ,  H03F2203/45134 ,  H03F2203/45138 ,  H03F2203/45212 ,  H03F2203/45466 ,  H03F2203/45482 ,  H03F2203/45526 ,  H03F2203/45652

摘要： In an example embodiment, an apparatus, such as a two stage operational amplifier, comprising a first stage amplifier having an input and an output, and a second stage amplifier having an input and an output, the input of the second stage amplifier is coupled to the output of the first stage amplifier. A first bias circuit is operable to set a common mode voltage of the first amplifier. A second bias circuit is operable to set a common mode voltage of the second amplifier. A first feedback circuit is coupled to the first bias circuit and the output of the first stage. The first feedback circuit is operable to control the common mode voltage of the first stage amplifier based on the common mode voltage set by the first bias circuit and the output of the first stage amplifier.

摘要翻译： 在示例性实施例中，包括具有输入和输出的第一级放大器和具有输入和输出的第二级放大器的诸如两级运算放大器的装置，第二级放大器的输入耦合到 第一级放大器的输出。 第一偏置电路可操作以设置第一放大器的共模电压。 第二偏置电路可操作以设置第二放大器的共模电压。 第一反馈电路耦合到第一偏置电路和第一级的输出端。 第一反馈电路可操作以基于由第一偏置电路设置的共模电压和第一级放大器的输出来控制第一级放大器的共模电压。