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31. 发明公开

EP3525343A1 AUTOMATIC LOOP GAIN CALIBRATION IN AMPLIFICATION CIRCUITS 有权
公开(公告)号：EP3525343A1
公开(公告)日：2019-08-14
申请号：EP19153906.3
申请日：2019-01-28
申请人： NXP B.V.
发明人： Berkhout, Marco , Mostert, Fred , Ciacci, Massimo , Koerts, Mattheus Johan , Kessel, Martin
IPC分类号： H03F3/217 , H03F3/183 , H03F1/08 , H03G3/30 , H04R3/00
摘要： Aspects are directed to an amplifier circuit including a signal processing circuit and a calibration circuit. In certain specific embodiments, the signal processing circuit includes a signal combiner and a closed-loop feedback path, and the signal processing circuit is designed to provide a loop transfer function for a derived signal partly representing contributions from an audio input signal, a control or pilot signal having a target frequency range, and a calibration signal. The signal combiner is designed to combine aspects of the control or pilot signal and aspects of the audio input signal, and the calibration circuit is designed to adjust an effective gain of the derived signal in response to whether a unity-gain frequency of a signal in the closed-loop feedback path, as provided via the loop transfer function, is higher or lower than the target frequency range. Consistent therewith and in yet more specific embodiments, such an amplifier circuit can define the target frequency range relative to the transfer function and an associated unity-gain frequency.

32. 发明公开

EP3439174A1 PLURAL FEEDBACK LOOPS INSTRUMENTATION FOLDED CASCODE AMPLIFIER 有权
公开(公告)号：EP3439174A1
公开(公告)日：2019-02-06
申请号：EP18186585.8
申请日：2018-07-31
申请人： Harman International Industries, Incorporated
发明人： Danyuk, Dimitri , Eichenbaum, Todd A.
IPC分类号： H03F1/32 , H03F3/45 , H03F3/183 , H03G3/00
摘要： An instrumentation amplifier (500) configured for providing high common mode rejection is described and includes an input differential stage (505, 506) configured to receive a differential input voltage and a folded cascode amplifying stage (514, 515) configured to receive output current mode signals provided from the input differential stage (505, 506). A plurality of feedback networks is provided to improve the input differential stage (505, 506). The amplifier may operate to provide an enhanced common mode rejection ratio of a single gain block in the instrumentation amplifier (500). In some examples, the circuitry may have a differential folded cascode amplifying stage which permits high precision and low distortion of amplified signals without degrading the common mode rejection ratio.

33. 发明公开

EP3352373A1 SYSTEMS AND METHODS FOR DETECTION OF LOAD IMPEDANCE OF A TRANSDUCER DEVICE COUPLED TO AN AUDIO DEVICE 有权
公开(公告)号：EP3352373A1
公开(公告)日：2018-07-25
申请号：EP17207083.1
申请日：2014-09-15
申请人： Cirrus Logic, Inc.
发明人： Ilango, Anand , Allen, Daniel John , Jindal, Vivek , Satoskar, Aniruddha , Thandri, Bharath Kumar
IPC分类号： H03F1/02 , G01R31/28 , H03F1/52 , H03F3/181 , H03F3/183 , H04R3/00
CPC分类号： H04R3/007 , G10K11/17854 , G10K11/17881 , G10K11/17885 , G10K2210/1081 , G10K2210/30232 , G10K2210/3045 , G10K2210/3049 , H03F1/0211 , H03F1/0227 , H03F1/52 , H03F3/181 , H03F3/183 , H03F3/185 , H03F3/52 , H03F2200/03 , H03F2200/462 , H03F2200/471 , H04R5/04 , H04R29/001 , H04R2420/05
摘要： In accordance with systems and methods of the present disclosure, an audio device may include an electrical terminal, an audio circuit, and a transducer load detection circuit. The electrical terminal may couple a transducer device to the audio device. The audio circuit may generate an analog audio signal, wherein the analog audio signal is coupled to the electrical terminal. The transducer load detection circuit may detect a load impedance of the transducer device when the transducer device is coupled to the audio device from characteristics measured at the electrical terminal.

34. 发明公开

EP3329591A1 ELECTRONIC CIRCUIT FOR A MICROPHONE AND MICROPHONE 有权
公开(公告)号：EP3329591A1
公开(公告)日：2018-06-06
申请号：EP15745180.8
申请日：2015-07-27
申请人： TDK Corporation
发明人： ROCCA, Gino
IPC分类号： H03G3/30 , H03F3/183 , H03F3/50
CPC分类号： H04R3/00 , H03F3/183 , H03F3/505 , H03F2200/03 , H03F2200/435 , H03F2203/5015 , H03F2203/5036 , H03G3/3005 , H04R3/007 , H04R29/004 , H04R2201/003 , H04R2410/00
摘要： The electronic circuit (10) comprises an input stage (Pre_amp) for pre-amplifying an electrical input signal of the electronic circuit (10) provided by a transducer (MEMS). Furthermore, the electronic circuit (10) comprises an output stage (T_amp) for providing a microphone output signal by processing an output signal of the input stage (Pre_amp). The electronic circuit (10) comprises an adjustable output load (RS) arranged and configured for setting a current draw of the output stage (T_amp). Additionally, the electronic circuit (10) comprises a measurement circuit (P_det) configured to capture the output signal of the input stage (Pre_amp) and an automatic control circuit (ACC) configured to adjust the adjustable output load (RS) dependent on the captured output signal of the input stage (Pre_amp).

35. 发明授权

EP2571161B1 AMPLIFIER 有权
标题翻译：放大器
公开(公告)号：EP2571161B1
公开(公告)日：2018-03-21
申请号：EP11780398.1
申请日：2011-05-13
申请人： Panasonic Intellectual Property Management Co., Ltd.
发明人： OZAKI, Seigo , SUKEGAWA, Rintaro
IPC分类号： H03F1/34 , H03F1/02 , H03F1/32 , H03F3/181 , H03F3/217 , H03F3/183
CPC分类号： H03F3/183 , H03F1/0227 , H03F1/3205 , H03F3/2173 , H03F2200/504
摘要： Disclosed is an amplifier with which output signal distortion can be reduced, and deterioration in power efficiency can be reduced. The amplifier is provided with a power supply voltage control unit (11) that generates a voltage control signal from a simple envelope of an input signal in order to control a variable voltage power supply (12) . The power supply voltage control unit (11) is composed of: a slope comparison processing unit (112) that calculates the slope required to generate a voltage control signal; a total delay time calculation unit (113) that calculates the sum of the delay times between the dots produced by the slope comparison process; and a voltage control signal generation unit (114) that generates a voltage control signal in such a manner that the waveform formed by the voltage control signal, which controls the variable voltage power supply (12), constitutes a waveform that reflects the selected slope or the sum of the slew rate and delay time. The voltage control signal is output to the variable voltage power supply (12) after being adjusted to match the timing at which the input signal is amplified by an amplifier unit (14).

36. 发明公开

EP3054591A3 CURRENT LIMITER 无效
标题翻译： STROMBEGRENZER
公开(公告)号：EP3054591A3
公开(公告)日：2017-01-11
申请号：EP16151354.4
申请日：2016-01-14
申请人： NXP B.V.
发明人： Koerts, Mattheus Johan , Mostert, Fred , Jorritsma, Fré Jorrit
IPC分类号： H03F1/52 , H03F3/217 , H03F3/183 , H03F3/21
CPC分类号： H03F1/523 , H03F1/52 , H03F3/183 , H03F3/211 , H03F3/2171 , H03F3/2173 , H03F2200/03 , H03F2200/351 , H03F2203/21139
摘要： A current limiter for Class-D amplifiers measures and stores a position of an over-current event. By comparing the stored position, output signals can be selectively inverted. As a result, the Class-D amplifier remains in a defined modulation scheme even during period of current limiting.
摘要翻译： D类放大器的限流器测量并存储过电流事件的位置。通过比较存储的位置，可以选择性地反转输出信号。因此，即使在电流限制期间，D类放大器仍然保持在限定的调制方案中。

37. 发明公开

EP2797229A4 CLASS-D POWER AMPLIFIER 有权
标题翻译： D类功率转换器
公开(公告)号：EP2797229A4
公开(公告)日：2015-09-09
申请号：EP12860818
申请日：2012-12-19
申请人： YAMAHA CORP
发明人： TOGAWA TAKESHI
IPC分类号： H03F3/217 , H03F1/52 , H03F3/183 , H03F3/68 , H04R3/00
CPC分类号： H03F3/217 , H03F1/523 , H03F3/181 , H03F3/183 , H03F3/68

38. 发明公开

EP2819303A4 AUDIO AMPLIFIER AND POWER SUPPLY VOLTAGE SWITCHING METHOD 有权
标题翻译： AUDIOVER初学者和供电电压切换过程
公开(公告)号：EP2819303A4
公开(公告)日：2015-08-05
申请号：EP13751157
申请日：2013-02-06
申请人： YAMAHA CORP
发明人： YAMADA MORITO
IPC分类号： H03F1/02 , H03F1/30 , H03F3/183 , H03F3/21 , H03G7/00
CPC分类号： H03F1/0222 , H03F1/0244 , H03F1/025 , H03F1/305 , H03F3/183 , H03F3/21 , H03F2200/03 , H03F2200/504 , H03F2200/507 , H03F2200/511 , H03G7/002 , H03G7/007

39. 发明公开

EP2532090A4 METHOD AND ARRANGEMENT FOR DRIVING A MICROPHONE 有权
标题翻译： VERFAHREN UND VORRICHTUNG ZUR ANSTEUERUNG EINES MIKROFONS
公开(公告)号：EP2532090A4
公开(公告)日：2014-10-22
申请号：EP10845362
申请日：2010-09-13
申请人： RES ELECTRONICS LEKSAND AB
发明人： ERIKSSON SVEN-ÄKE
IPC分类号： H03F3/183 , H03F1/56 , H03F3/45 , H04R19/04
CPC分类号： H03F3/183 , H03F3/45076 , H03F2200/534 , H03F2203/45228
摘要： Disclosed is a differential microphone pre-amplifier circuit (120) for providing an amplified differential signal at a first (A) and a second (B) output terminal of the microphone pre-amplifier (120), including a first voltage controlled current generator (101), a second voltage controlled current generator (102) and a third voltage controlled current generator (103) all being configured to receive, amplify and convert a voltage signal generated by an associated microphone (110) to a current signal output.
摘要翻译：公开了一种差分麦克风前置放大器电路（120），用于在麦克风前置放大器（120）的第一（A）和第二（B）输出端提供放大的差分信号，包括第一压控电流发生器 101），第二压控电流发生器（102）和第三压控电流发生器（103），其全部被配置为接收，放大并将由相关联的麦克风（110）产生的电压信号转换成电流信号输出。

40. 发明授权

EP0653119B1 METHODS AND APPARATUS FOR MICROPHONE PREAMPLIFICATION 失效
标题翻译：用于麦克风前化的方法和设备
公开(公告)号：EP0653119B1
公开(公告)日：2000-09-20
申请号：EP94920699.9
申请日：1994-06-02
申请人： APPLE COMPUTER, INC.
发明人： HEYL, Lawrence, Frederick , FARRAR, Douglas, Mann
IPC分类号： H03F3/187 , H03F3/183
CPC分类号： H03F3/183 , H03F3/187
摘要： Preamplifying circuitry amplifies sound signals for input into a computer system. A first stage common-emitter amplifier (16) provides high-gain amplification of the input signal, while a second stage amplifier (18) comprising an operational amplifier is suitable for driving a cable with the amplified sound signal. A low-cost constant voltage source (14) comprising a diode (26) and an operational amplifier (21a) supplies a voltage reference to both amplifier stages (16, 18) with a very high rejection of system noise. The circuitry and methods provide a low-cost, easily manufactured preamplifier suitable for sound input in desktop computing devices.
摘要翻译：前置放大电路放大声音信号以输入到计算机系统中。第一级共发射极放大器（16）提供输入信号的高增益放大，而包括运算放大器的第二级放大器（18）适合于用放大的声音信号驱动电缆。包括二极管（26）和运算放大器（21a）的低成本恒压源（14）以非常高的系统噪声抑制向两个放大器级（16,18）提供电压参考。该电路和方法提供了一种低成本，易于制造的前置放大器，适用于桌面计算设备的声音输入。

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