公开(公告)号：US20160365859A1

公开(公告)日：2016-12-15

申请号：US14862520

申请日：2015-09-23

申请人： MEDIATEK INC.

发明人： Fei Song ,  Osama Shana'a ,  Yuen Hui Chee

IPC分类号： H03K19/0185 ,  H04B1/40

CPC分类号： H03K19/018514 ,  H03F3/195 ,  H03F3/3001 ,  H03F3/3028 ,  H03F3/3033 ,  H03F3/3037 ,  H03F3/45201 ,  H03F3/45475 ,  H03F3/505 ,  H03F2200/21 ,  H03F2200/42 ,  H03F2200/451 ,  H03F2200/498 ,  H03F2200/69 ,  H03F2200/75 ,  H03F2203/45136 ,  H03F2203/45168 ,  H03F2203/45224 ,  H03F2203/45258 ,  H03F2203/45301 ,  H03F2203/45496 ,  H03F2203/45544 ,  H03F2203/45596 ,  H03F2203/45656 ,  H03F2203/45674 ,  H04B1/40 ,  H04B2001/0425

摘要： A wideband highly-linear buffer circuit exhibiting a low output impedance comprises a first PFET (PFET1), a second PFET (PFET2), a first NFET (NFET1), and a second NFET (NFET2). Sources of PFET1 and PFET2 are coupled to VDD. PFET1's drain is coupled to an output lead. PFET2 acts as a current source. NFET1's drain is coupled to PFET2's drain and to PFET1's gate. NFET1's source is coupled to the output lead. NFET2's source is coupled to ground. NFET2's drain is coupled to NFET1's source and to the output lead. NFET1's gate is AC coupled to a first input lead. In a single-ended input example, NFET2's gate is AC coupled NFET1's drain. In a differential input example, NFET2's gate is AC coupled to a second input lead. In another differential input example, PFET2 is not just a current source, but rather PFET2's gate is AC coupled to the first input lead.

摘要翻译： 呈现低输出阻抗的宽带高线性缓冲电路包括第一PFET（PFET1），第二PFET（PFET2），第一NFET（NFET1）和第二NFET（NFET2）。 PFET1和PFET2的源极耦合到VDD。 PFET1的漏极耦合到输出引线。 PFET2作为电流源。 NFET1的漏极耦合到PFET2的漏极和PFET1的栅极。 NFET1的源极耦合到输出引线。 NFET2的源极耦合到地。 NFET2的漏极耦合到NFET1的源极和输出引线。 NFET1的栅极与第一个输入引线交流耦合。 在单端输入示例中，NFET2的栅极是交流耦合NFET1的漏极。 在差分输入示例中，NFET2的栅极被AC耦合到第二输入引线。 在另一个差分输入示例中，PFET2不仅仅是电流源，而是PFET2的栅极与第一个输入引线交流耦合。

公开(公告)号：US09385665B2

公开(公告)日：2016-07-05

申请号：US14187480

申请日：2014-02-24

申请人： Telefonaktiebolaget L M Ericsson (publ)

发明人： Ossi Toivonen ,  Sami Vilhonen

IPC分类号： H03F1/26 ,  H03F1/32 ,  H03F3/19 ,  H03F3/21 ,  H03F3/45 ,  H03F1/02 ,  H03F1/22 ,  H03F3/193 ,  H03F3/24

CPC分类号： H03F1/3241 ,  H03F1/0266 ,  H03F1/223 ,  H03F1/3211 ,  H03F1/3252 ,  H03F3/19 ,  H03F3/193 ,  H03F3/21 ,  H03F3/211 ,  H03F3/24 ,  H03F3/45071 ,  H03F3/45179 ,  H03F3/45183 ,  H03F3/45201 ,  H03F2200/102 ,  H03F2200/18 ,  H03F2200/24 ,  H03F2200/405 ,  H03F2200/453 ,  H03F2200/465 ,  H03F2200/541 ,  H03F2200/555 ,  H03F2200/78 ,  H03F2203/45168 ,  H03F2203/45224 ,  H03F2203/45292 ,  H03F2203/45394

摘要： A linearization circuit improves the linearity of a power amplifier based on an envelope of an input RF signal. The linearization circuit comprises an RF signal generation circuit, a replica circuit, and an adaptive amplifier. The RF signal generation circuit generates the RF signal from a phase and an amplitude of an input digital signal. The replica circuit extracts the envelope from the RF signal and generates a sensing voltage based on the extracted envelope. The adaptive amplifier generates an adaptive bias voltage for the power amplifier based on the sensing voltage, and applies the adaptive bias voltage to the power amplifier and to the replica circuit to improve the linearity of the power amplifier by regulating the power amplifier and the replica circuit according to the envelope.

摘要翻译： 线性化电路基于输入RF信号的包络改善功率放大器的线性度。 线性化电路包括RF信号产生电路，复制电路和自适应放大器。 RF信号产生电路根据输入数字信号的相位和幅度产生RF信号。 复制电路从RF信号中提取信封，并根据提取的包络产生感测电压。 自适应放大器基于感测电压产生用于功率放大器的自适应偏压，并且通过调节功率放大器和复制电路将自适应偏置电压施加到功率放大器和复制电路以提高功率放大器的线性度 根据信封。

公开(公告)号：US07643018B1

公开(公告)日：2010-01-05

申请号：US09608142

申请日：2000-06-30

申请人： Steven F. Brown ,  Robert R. Asprey ,  Winston J. Stewart ,  Philip M. Kirshtein

发明人： Steven F. Brown ,  Robert R. Asprey ,  Winston J. Stewart ,  Philip M. Kirshtein

IPC分类号： G09G5/00

CPC分类号： H03F3/3432 ,  H03F1/22 ,  H03F1/34 ,  H03F3/19 ,  H03F3/3437 ,  H03F2203/45168 ,  H04N5/148

摘要： A transmission system for transmitting analog color video signals wherein a cable comprising multiple twisted pairs is employed, and certain of these pairs are coupled to carry selected color signals as a function of the delay provided by particular twist rates. In certain instances, selected signal delay devices are connected in circuit with certain twisted pairs. By such an arrangement, it has been found that relatively long distances between a computer and a monitor may be spanned by relatively low-cost, twisted pair cable commonly used for telephone communications.

公开(公告)号：US5576723A

公开(公告)日：1996-11-19

申请号：US219979

申请日：1994-03-29

申请人： Robert R. Asprey

发明人： Robert R. Asprey

IPC分类号： G06F3/02 ,  G09G5/00 ,  H03F1/22 ,  H03F3/19 ,  H03F3/343 ,  H04L25/08

CPC分类号： G09G5/006 ,  G06F3/0227 ,  H03F1/22 ,  H03F3/19 ,  H03F3/3432 ,  H03F3/3437 ,  H04L25/08 ,  H03F2203/45168

摘要： A converter for converting VGA color signals to gray scale monochrome signals wherein each of the color signals, red, green, and blue, are processed through a circuit consisting of an emitter-follower, a selected value resistor, and a diode and wherein the outputs of the three circuits are connected together and across a load impedance for an analog monochrome monitor.

摘要翻译： A转换器，用于将VGA彩色信号转换成灰度单色信号，其中通过由射极跟随器，选定值电阻器和二极管组成的电路来处理每个彩色信号，红色，绿色和蓝色，并且其中输出 的三个电路连接在一起并通过模拟单色监视器的负载阻抗。

公开(公告)号：US09960947B2

公开(公告)日：2018-05-01

申请号：US15647275

申请日：2017-07-12

申请人： MEDIATEK INC.

发明人： Chien-Cheng Lin ,  Ming-Da Tsai

IPC分类号： H04B1/00 ,  H04L27/36 ,  H03D7/16 ,  H03F1/32 ,  H03C3/08 ,  H04B1/04

CPC分类号： H04L27/366 ,  H03C3/08 ,  H03D7/166 ,  H03F1/14 ,  H03F1/3205 ,  H03F1/3211 ,  H03F1/3264 ,  H03F3/21 ,  H03F3/45179 ,  H03F3/45183 ,  H03F2200/21 ,  H03F2200/213 ,  H03F2200/228 ,  H03F2200/249 ,  H03F2200/471 ,  H03F2200/489 ,  H03F2200/492 ,  H03F2200/534 ,  H03F2200/75 ,  H03F2201/3218 ,  H03F2203/45036 ,  H03F2203/45101 ,  H03F2203/45112 ,  H03F2203/45134 ,  H03F2203/45136 ,  H03F2203/45138 ,  H03F2203/45146 ,  H03F2203/45151 ,  H03F2203/45156 ,  H03F2203/45168 ,  H03F2203/45172 ,  H03F2203/45208 ,  H03F2203/45256 ,  H03F2203/45292 ,  H03F2203/45312 ,  H03F2203/45356 ,  H03F2203/45374 ,  H03F2203/45386 ,  H03F2203/45402 ,  H03F2203/45436 ,  H03F2203/45544 ,  H03F2203/45596 ,  H03F2203/45622 ,  H04B2001/0408

摘要： A compensation circuit of a power amplifier includes a varactor, a voltage sensor and a control circuit. The varactor is coupled to an input terminal of the power amplifier. The voltage sensor is arranged for detecting an amplitude of an input signal of the power amplifier to generate a detecting result. The control circuit is coupled to the varactor and the voltage sensor, and is arranged for controlling a bias voltage of the varactor to adjust a capacitance of the varactor according to the detecting result.

公开(公告)号：US09575500B2

公开(公告)日：2017-02-21

申请号：US14838245

申请日：2015-08-27

申请人： Dialog Semiconductor (UK) Limited

发明人： Frank Kronmueller ,  Ambreesh Bhattad

IPC分类号： G05F1/575 ,  H03F3/45

CPC分类号： G05F1/575 ,  H03F3/21 ,  H03F3/45179 ,  H03F3/45183 ,  H03F2200/129 ,  H03F2203/45112 ,  H03F2203/45116 ,  H03F2203/45166 ,  H03F2203/45168 ,  H03F2203/45674

摘要： A voltage regulator is described. It includes an amplification stage to control a voltage level of a first gain node and of a second gain node in response to an input voltage, to activate a first and a second output stage, respectively. It further includes the first output stage to source a current at an output node of the voltage regulator from a first potential. The voltage regulator includes the second output stage to sink a current at the output node to a second potential. The voltage regulator includes a first operating point control circuit to set the voltage level of the first gain node such that a first maintenance current is sourced by the first output stage; and/or a second operating point control circuit to set the voltage level of the second gain node such that a second maintenance current is sunk by the second output stage.

摘要翻译： 描述了电压调节器。 它包括一个放大级，用于分别响应于输入电压来控制第一增益节点和第二增益节点的电压电平，分别激活第一和第二输出级。 它进一步包括第一输出级，以从第一电位输出电压调节器的输出节点处的电流。 电压调节器包括第二输出级，以将输出节点处的电流吸收到第二电位。 电压调节器包括第一操作点控制电路，用于设置第一增益节点的电压电平，使得第一维持电流由第一输出级提供; 和/或第二操作点控制电路，以设置第二增益节点的电压电平，使得第二维持电流被第二输出级降低。

公开(公告)号：US20150244328A1

公开(公告)日：2015-08-27

申请号：US14187480

申请日：2014-02-24

申请人： Telefonaktiebolaget L M Ericsson (publ)

发明人： Ossi Toivonen ,  Sami Vilhonen

IPC分类号： H03F1/32 ,  H03F3/45 ,  H03F3/19 ,  H03F3/21

CPC分类号： H03F1/3241 ,  H03F1/0266 ,  H03F1/223 ,  H03F1/3211 ,  H03F1/3252 ,  H03F3/19 ,  H03F3/193 ,  H03F3/21 ,  H03F3/211 ,  H03F3/24 ,  H03F3/45071 ,  H03F3/45179 ,  H03F3/45183 ,  H03F3/45201 ,  H03F2200/102 ,  H03F2200/18 ,  H03F2200/24 ,  H03F2200/405 ,  H03F2200/453 ,  H03F2200/465 ,  H03F2200/541 ,  H03F2200/555 ,  H03F2200/78 ,  H03F2203/45168 ,  H03F2203/45224 ,  H03F2203/45292 ,  H03F2203/45394

摘要： A linearization circuit improves the linearity of a power amplifier based on an envelope of an input RF signal. The linearization circuit comprises an RF signal generation circuit, a replica circuit, and an adaptive amplifier. The RF signal generation circuit generates the RF signal from a phase and an amplitude of an input digital signal. The replica circuit extracts the envelope from the RF signal and generates a sensing voltage based on the extracted envelope. The adaptive amplifier generates an adaptive bias voltage for the power amplifier based on the sensing voltage, and applies the adaptive bias voltage to the power amplifier and to the replica circuit to improve the linearity of the power amplifier by regulating the power amplifier and the replica circuit according to the envelope.

摘要翻译： 线性化电路基于输入RF信号的包络改善功率放大器的线性度。 线性化电路包括RF信号产生电路，复制电路和自适应放大器。 RF信号产生电路根据输入数字信号的相位和振幅产生RF信号。 复制电路从RF信号中提取信封，并根据提取的包络产生感测电压。 自适应放大器基于感测电压产生用于功率放大器的自适应偏置电压，并且通过调节功率放大器和复制电路将自适应偏置电压施加到功率放大器和复制电路以提高功率放大器的线性度 根据信封。

公开(公告)号：US5926509A

公开(公告)日：1999-07-20

申请号：US744629

申请日：1996-11-06

申请人： Winston J. Stewart ,  Philip M. Kirshtein ,  Steven F. Brown ,  Robert R. Asprey

发明人： Winston J. Stewart ,  Philip M. Kirshtein ,  Steven F. Brown ,  Robert R. Asprey

IPC分类号： H03F1/22 ,  H03F1/34 ,  H03F3/19 ,  H03F3/343 ,  H04N7/10 ,  H04N11/02 ,  G06F3/00 ,  G06F13/00

CPC分类号： H04N7/108 ,  H03F1/22 ,  H03F1/34 ,  H03F3/19 ,  H03F3/3432 ,  H03F3/3437 ,  H04N11/02 ,  H03F2203/45168

摘要： A transmission system for transmitting analog color video signals wherein a cable comprising multiple twisted pairs is employed, and certain of these pairs are coupled to carry selected color signals as a function of the delay provided by particular twist rates. In certain instances, selected signal delay devices are connected in circuit with certain twisted pairs. By such an arrangement, it has been found that relatively long distances between a computer and monitor may be spanned by relatively low-cost, twisted pair cable commonly used for telephone communications.

摘要翻译： 一种用于传输模拟彩色视频信号的传输系统，其中使用包括多个双绞线的电缆，并且这些配对中的某些被耦合以作为由特定扭曲速率提供的延迟的函数来携带所选择的颜色信号。 在某些情况下，所选择的信号延迟装置以某些双绞线连接在电路中。 通过这样的布置，已经发现计算机和监视器之间的相对长的距离可以由通常用于电话通信的相对低成本的双绞线缆跨越。

公开(公告)号：US4935703A

公开(公告)日：1990-06-19

申请号：US359848

申请日：1989-05-31

申请人： Vanni Poletto

发明人： Vanni Poletto

IPC分类号： H03F1/02 ,  H03F3/30

CPC分类号： H03F3/3069 ,  H03F1/0261 ,  H03F3/3071 ,  H03F2203/30121 ,  H03F2203/30144 ,  H03F2203/45168

摘要： A bias current source for the output stage of an operational amplifier is controllable. The bias current generator senses the voltage differential on the differential operational amplifier inputs. When an input differential voltage is sensed which generates a rising output signal, additional bias current is provided to the output stage. When the output voltage is constant or falling, the bias current to the output stage is decreased.

公开(公告)号：US20180069742A1

公开(公告)日：2018-03-08

申请号：US15647275

申请日：2017-07-12

申请人： MEDIATEK INC.

发明人： Chien-Cheng Lin ,  Ming-Da Tsai

IPC分类号： H04L27/36 ,  H03D7/16 ,  H03F1/32 ,  H03C3/08

CPC分类号： H04L27/366 ,  H03C3/08 ,  H03D7/166 ,  H03F1/14 ,  H03F1/3205 ,  H03F1/3211 ,  H03F1/3264 ,  H03F3/21 ,  H03F3/45179 ,  H03F3/45183 ,  H03F2200/21 ,  H03F2200/213 ,  H03F2200/228 ,  H03F2200/249 ,  H03F2200/471 ,  H03F2200/489 ,  H03F2200/492 ,  H03F2200/534 ,  H03F2200/75 ,  H03F2201/3218 ,  H03F2203/45036 ,  H03F2203/45101 ,  H03F2203/45112 ,  H03F2203/45134 ,  H03F2203/45136 ,  H03F2203/45138 ,  H03F2203/45146 ,  H03F2203/45151 ,  H03F2203/45156 ,  H03F2203/45168 ,  H03F2203/45172 ,  H03F2203/45208 ,  H03F2203/45256 ,  H03F2203/45292 ,  H03F2203/45312 ,  H03F2203/45356 ,  H03F2203/45374 ,  H03F2203/45386 ,  H03F2203/45402 ,  H03F2203/45436 ,  H03F2203/45544 ,  H03F2203/45596 ,  H03F2203/45622 ,  H04B2001/0408

摘要： A compensation circuit of a power amplifier includes a varactor, a voltage sensor and a control circuit. The varactor is coupled to an input terminal of the power amplifier. The voltage sensor is arranged for detecting an amplitude of an input signal of the power amplifier to generate a detecting result. The control circuit is coupled to the varactor and the voltage sensor, and is arranged for controlling a bias voltage of the varactor to adjust a capacitance of the varactor according to the detecting result.