公开(公告)号：EP3026929A1

公开(公告)日：2016-06-01

申请号：EP15194758.7

申请日：2015-11-16

申请人： BlackBerry Limited

发明人： ANAZAWA, Isao Ginn

IPC分类号： H04R3/00 ,  H03G11/00 ,  H04R29/00

CPC分类号： H03G1/0035 ,  H04R3/007 ,  H04R29/003 ,  H04R2499/11

摘要： A method, system and apparatus for voice coil protection using damping are provided. At a device and/or a system comprising: a processor; a sound transducer comprising a voice coil; a power supply; an amplifier in communication with the voice coil; and a circuit configured to apply an electromotive force ("EMF") to the voice coil under control of the processor, the amplifier is placed into a standby state. When the amplifier is in the standby state, the circuit is controlled to apply the EMF to the voice coil using the power supply so that the voice coil has restricted excursion.

摘要翻译： 提供了一种使用阻尼进行音圈保护的方法，系统和装置。 一种设备和/或系统，包括：处理器; 包括音圈的声音换能器; 电源; 与音圈通信的放大器; 以及被配置为在所述处理器的控制下向所述音圈施加电动势（“EMF”）的电路，所述放大器被置于待机状态。 当放大器处于待机状态时，电路被控制以使用电源将EMF施加到音圈，使得音圈具有限制的偏移。

公开(公告)号：EP2524425A4

公开(公告)日：2014-01-01

申请号：EP11732032

申请日：2011-01-03

申请人： MICROCHIP TECH INC

发明人： KOBAYASHI BUN ,  SCHELL STEVEN W ,  KIM YONGHAN CHRIS ,  CHOW PEI-MING DANIEL ,  CHANG MAU-CHUNG FRANK

IPC分类号： H03F3/00 ,  H03F1/02 ,  H03F3/72

CPC分类号： H03F3/195 ,  H03F1/0261 ,  H03F1/0277 ,  H03F1/302 ,  H03F1/34 ,  H03F3/72 ,  H03F2200/144 ,  H03F2200/18 ,  H03F2200/27 ,  H03F2203/7206 ,  H03F2203/7236 ,  H03G1/0035

摘要： A step gain amplifier has an amplifier with an input and an output, and a bias circuit connected to the input and to a bias node. A passive feedback circuit using only passive elements connects the output to the input. A control circuit is connected to the bias circuit at the bias node.

公开(公告)号：EP2448123A1

公开(公告)日：2012-05-02

申请号：EP11151855.1

申请日：2011-01-24

申请人： ST-Ericsson SA

发明人： Rizzo, Francesco ,  Somayajula, Shyam

IPC分类号： H03M1/18 ,  H03M3/00 ,  H03G1/00

CPC分类号： H03M3/458 ,  H03G1/0035 ,  H03G1/0094 ,  H03M3/484

摘要： A delta-sigma analog-to-digital converter (100) comprises: a summing stage (20) having a first input (22) for an input signal (V IN ) and a second input (23) for a feedback signal (V FB ); an integrator (30) coupled to an output (24) of the summing stage (20); an analog-to-digital conversion stage (40) coupled to an output (34) of the integrator (30); and a switchable gain stage (70) coupled in a feedback path (80) between an output (44) of the analog-to-digital conversion stage (40) and the second input (23) of the summing stage (20). The switchable gain stage (70) is arranged to switch, responsive to a gain selection signal (S), between a first gain and a second gain via a transition period (T) comprising time periods during which the switchable gain stage (70) has the first gain interleaved with time periods during which the switchable gain stage (70) has the second gain. The time periods at the first gain comprise periods that decrease in duration over the transition period (T) and the time periods at the second gain comprise periods that increase in duration over the transition period (T).

摘要翻译： Δ-Σ模数转换器（100）包括：加法级（20），其具有用于输入信号（V IN）的第一输入端（22）和用于反馈信号（V FB）的第二输入端 ）; 耦合到所述求和级（20）的输出（24）的积分器（30）; 耦合到积分器（30）的输出（34）的模数转换级（40）; 以及耦合在模数转换级（40）的输出（44）和求和级（20）的第二输入（23）之间的反馈路径（80）中的可切换增益级（70）。 可切换增益级（70）被布置成经由包括可切换增益级（70）具有的时间段的过渡时段（T）响应于增益选择信号（S）而在第一增益和第二增益之间切换 所述第一增益与所述可切换增益级（70）具有第二增益的时间段交错。 第一增益的时间段包括在过渡期（T）期间持续时间减少的周期，并且第二增益期间的时间段包括在过渡期（T）期间持续时间增加的周期。

公开(公告)号：EP1530289A1

公开(公告)日：2005-05-11

申请号：EP04445114.4

申请日：2004-11-08

申请人： Infineon Technologies AG

发明人： Dahlin, Jan

IPC分类号： H03G1/00

CPC分类号： G05F3/205 ,  H03G1/0035

摘要： The present invention relates to a voltage to current converter, comprising a signal stage (1) with a first transistor (11) and a first resistor (12). The first transistor (11) is adapted to be fed with an input signal voltage (V in ). The converter is adapted to generate an output current, comprising an output DC bias current (I B1 ) and an output signal current (i out ), and to provide a gain adjustment through the variation of the first resistor (12). The present invention specifically teaches that the converter comprises a bias stage (2), adapted to generate and feed the signal stage (1) with an input DC bias voltage (V DC ), which input DC bias voltage (V DC ) is adapted to keep the output DC bias current (I B1 ) constant during the variation of the first resistor (12).

摘要翻译： 本发明涉及电压 - 电流转换器，包括具有第一晶体管（11）和第一电阻（12）的信号级（1）。 第一晶体管（11）适于馈送输入信号电压（Vin）。 转换器适于产生包括输出DC偏置电流（IB1）和输出信号电流（iout）的输出电流，并且通过第一电阻器（12）的变化来提供增益调整。 本发明具体教导了转换器包括偏置级（2），其适于用输入DC偏置电压（VDC）产生和馈送信号级（1），输入DC偏置电压（VDC）适于保持 输出DC偏置电流（IB1）在第一电阻器（12）的变化期间恒定。

公开(公告)号：EP0857293A1

公开(公告)日：1998-08-12

申请号：EP96936151.0

申请日：1996-10-02

申请人： AVID TECHNOLOGY, INC.

发明人： BREITBARTH, Neal, E.

IPC分类号： G01B11 ,  G01B21 ,  G01D5 ,  H03G1

CPC分类号： H03G1/0035

摘要： An apparatus (10) indicating the position of an adjustable lever (18), such as a control lever in a digital audio console, is described. A frame member (12, 13, 15, 17) constrains movement of the adjustable lever (18). The lever is operatively connected to an encoder apparatus (22), such that movement of the lever (18) causes movement of the encoder apparatus (22) to provide an indication of position of the lever (18) within the frame member (12, 13, 15, 17).

摘要翻译： 描述了指示可调节杆（18）的位置的装置（10），例如数字音频控制台中的控制杆。 框架构件（12,13,15,17）约束可调节杆（18）的运动。 杠杆可操作地连接到编码器装置（22），使得杠杆（18）的运动引起编码器装置（22）的运动，以提供杠杆（18）在框架构件（12）内的位置的指示， 13，15，17）。

公开(公告)号：EP0434266A3

公开(公告)日：1991-11-13

申请号：EP90313269.4

申请日：1990-12-06

申请人： FORD MOTOR COMPANY LIMITED ,  FORD-WERKE AKTIENGESELLSCHAFT ,  FORD FRANCE S. A.

发明人： Zerod, Richard David

IPC分类号： H03G3/30

CPC分类号： H03G3/301 ,  H03G1/0035

摘要： An audio system for amplifying an audio signal the system comprising, a main chassis (10) including preamplifier means (18) for amplifying said audio signal and gain control means (35) coupled to said preamplifier means for reducing the magnitude of said audio signal output by said preamplifier means in response to a gain reduction signal, at least one audio line (11) for transmitting said audio signal from said preamplifier means, and a remote amplifier stage (12) for receiving said audio signal and including power amplifier means (25) coupled to said audio line (11) for amplifying said audio signal by a substantially fixed gain and first clip detector means (40) coupled to said power amplifier means (25) and said gain control means (35) for generating said gain reduction signal whenever signal clipping occurs in said remote amplifier stage.

公开(公告)号：EP0163461A2

公开(公告)日：1985-12-04

申请号：EP85303482.5

申请日：1985-05-17

申请人： Donovan, John S.

发明人： Donovan, John S.

IPC分类号： H03F3/26

CPC分类号： H03G3/10 ,  H03F3/265 ,  H03G1/0035

摘要： A push pull, small signal amplifier arrangement which employs Metal Oxide Semiconductor/Field Effect Transistors. Depletion type (14,16) employed in the first stage while enhanced type (54, 56) may be employed in the second stage. The two stages are directly connected together and means for controlling the gain of both stages simultaneously are included. Also disclosed is a number of configurations of various applications.

摘要翻译： 推拉式，小信号放大器布置，采用金属氧化物半导体/场效应晶体管。 在第二阶段中可以使用在第一阶段中使用的增强型（54,56）的消耗型（14,16）。 两级直接连接在一起，同时包括两台控制增益的装置。 还公开了各种应用的多种配置。

公开(公告)号：EP0118178A1

公开(公告)日：1984-09-12

申请号：EP84300414.4

申请日：1984-01-24

申请人： TEKTRONIX, INC.

发明人： Bristol, Lloyd Rodney

IPC分类号： H03F3/45 ,  H03F1/30

CPC分类号： H03G1/0023 ,  H03F1/304 ,  H03F3/45103 ,  H03F3/45618 ,  H03F3/45623 ,  H03F3/45977 ,  H03F2203/45318 ,  H03F2203/45702 ,  H03G1/0035

摘要： Offset balancing method and apparatus for a DC amplifier (24) including gain selection (23) and polarity switching (25) circuits are disclosed. During the offset compensation process, the amplifier input is connected to ground and its polarity is switched between the normal and inverted states before detecting the resulting output DC levels. The difference between such output DC levels is used to generate an offset compensation signal to be applied to the amplifier. The offset compensation process is repeated for each gain selection of the DC amplifier.

公开(公告)号：EP0004099A1

公开(公告)日：1979-09-19

申请号：EP79100751.1

申请日：1979-03-13

申请人： KABUSHIKI KAISHA TOSHIBA

发明人： Katakura, Masayuki

IPC分类号： H03H11/00 ,  H03G1/00 ,  G05F1/10

CPC分类号： H03H11/46 ,  H03G1/0035

摘要： An electrically variable impedance circuit in which a voltage-current converter circuit (3) is provided to produce a current (I') having a megnitude corresponding to an instantaneous input signal potential (v) applied to an input terminal (1) and a current variation of the vottage-current converter circuit is fed back to the input terminal (1), the current variation being controlled by a control signal (Vc) to vary the circuit impedance seen from the Input terminal (1). In order to expand the range of linesrity in impedance, the voltage-current converter is so arranged that the varying component of its output current is linsariy proportional to the inatan- taneous input signal potendial (v). and a current converter circuit (4) is provided which linearly converts the output current of the voltage-current converter circuit and whose output is coupled to the input terminal (1). The current converter circuit (4) is comprised of a PN junction (51) which develops a voltage which is the logarithm of the output current of the voltage-current converter (3) and a transistor (81) between the base and emitter of which is spplied the voltage developed by the PN junction (5 1 ) to produce a current which is the exponential of the voltage developed by the PN junction. (Fig. 1)

公开(公告)号：EP3297184B1

公开(公告)日：2018-12-12

申请号：EP16382431.1

申请日：2016-09-15

申请人： Knowledge Development for POF SL

发明人： RODRÍGUEZ-PÉREZ, Alberto ,  ROLÍNDEZ ALBERICH, Luis ,  PÉREZ DE ARANDA ALONSO, Rubén

IPC分类号： H04B10/69 ,  H03G3/30

CPC分类号： H04B10/6931 ,  H03F3/45475 ,  H03F2203/45116 ,  H03F2203/45138 ,  H03F2203/45288 ,  H03G1/0035 ,  H03G3/001 ,  H03G3/3084 ,  H04B10/6933

摘要： This invention relates to a optical receiver circuit (200) comprising: at least one photo detector (207) configured to convert a received light signal to an input current signal, a transimpedance amplifier circuit (201) with an input to receive the input current signal from the at least one photo detector (207) and being configured to convert the received input current signal to an output voltage signal to generate an output signal of the transimpedance amplifier circuit (201), wherein the transimpedance amplifier circuit comprises a plurality of gain amplifier stages (209, 210, 211), a DC restoration component (205), wherein the DC restoration component (205) is configured to receive the output voltage signal of the transimpedance amplifier circuit (201) for restoring the DC component of the received current signal and configured for outputting a corresponding current signal, and an automatic gain control component (204) configured for controlling via at least one programmable feedback resistor (226, 227) the equivalent transimpedance of the transimpedance amplifier circuit based on the signal output by the DC restoration component (205) to provide a constant output voltage amplitude for different current ranges of the input current signal.