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1. 发明授权

US10965262B2 Interface electronic circuit for a microelectromechanical acoustic transducer and corresponding method 有权
公开(公告)号：US10965262B2
公开(公告)日：2021-03-30
申请号：US16378872
申请日：2019-04-09
申请人： STMicroelectronics S.r.l.
发明人： Alberto Danioni , Alessandro Morcelli
IPC分类号： H03F13/00 , H03F3/70 , H04R19/04
摘要： In at least one embodiment, an interface electronic circuit for a capacitive acoustic transducer having a sensing capacitor is provided. The interface electronic circuit includes an amplifier, a voltage regulator, a common-mode control circuit, and a reference generator. The amplifier has an input coupled to an electrode of the sensing capacitor. The voltage regulator is configured to receive a regulator reference voltage, generate a regulated voltage based on the regulator reference voltage, and supply the regulated voltage to a supply input of the amplifier. The common-mode control circuit controls a common-mode voltage present on the input of the amplifier based on a common-mode reference voltage. The reference generator receives a supply voltage and generates the regulator reference voltage and the common-mode reference voltage with respective values that are variable as a function of the supply voltage.

2. 发明申请

US20190335267A1 EARBUD OPERATION DURING EARBUD INSERTION DETECTION 审中-公开
公开(公告)号：US20190335267A1
公开(公告)日：2019-10-31
申请号：US16398074
申请日：2019-04-29
申请人： AVNERA CORPORATION
发明人： Michael Jon Wurtz , Amit Kumar , Jiajin An
IPC分类号： H04R1/10 , H03F13/00 , G10K11/178 , H03G7/00 , H04R29/00
摘要： A method of operating an earbud configured to be removed from and inserted into a user's ear canal can include generating an input signal by an input signal generating device. The method can also include determining whether an insertion event has occurred based on the generated input signal and causing the earbud to operate in a low power mode responsive to an absence of an insertion event determination after a first period of time. The method can also include causing the earbud to operate in an ultra-low power mode responsive to the absence of an insertion event determination after a second period of time that occurs after the first period of time, the ultra-low power mode having a lower power consumption than the low power mode.

3. 发明授权

US09071212B2 Audio amplifier 有权
标题翻译：音频放大器
公开(公告)号：US09071212B2
公开(公告)日：2015-06-30
申请号：US13628431
申请日：2012-09-27
申请人： d&b audiotechnik GmbH
发明人： Sven Moertel , Claus Renftle , Hermann Vogt
IPC分类号： H03F13/00 , H03F1/52 , H03F3/20
CPC分类号： H03F13/00 , H03F1/52 , H03F3/20
摘要： An audio amplifier may comprise a signal limiting circuit and a power amplifier. The signal limiting circuit may be configured to limit an audio signal received at an input and to provide it as a limited audio signal at an output. The power amplifier may have a supply connection which may be coupled to a power supply unit in order to supply power to the power amplifier. The power amplifier may be configured to amplify a signal, which may be based on the limited audio signal, and to provide it as a level-limited audio signal at an output which may be coupled to a load, so that the load may be operated at limited power. The signal limiting circuit may be configured to produce an audio signal which may be limited depending on the load.
摘要翻译：音频放大器可以包括信号限制电路和功率放大器。信号限制电路可以被配置为限制在输入处接收的音频信号，并将其提供为输出处的有限音频信号。功率放大器可以具有可以耦合到电源单元的供电连接，以向功率放大器供电。功率放大器可以被配置为放大可以基于受限音频信号的信号，并且将其提供为可以耦合到负载的输出处的电平限制音频信号，使得负载可以被操作在有限的权力。信号限制电路可以被配置为产生根据负载可能受到限制的音频信号。

4. 发明申请

US20130083947A1 AUDIO AMPLIFIER 有权
标题翻译：音频放大器
公开(公告)号：US20130083947A1
公开(公告)日：2013-04-04
申请号：US13628431
申请日：2012-09-27
申请人： d&b audiotechnik GmbH
发明人： Sven Moertel , Claus Renftle , Hermann Vogt
IPC分类号： H03F13/00
CPC分类号： H03F13/00 , H03F1/52 , H03F3/20
摘要： An audio amplifier may comprise a signal limiting circuit and a power amplifier. The signal limiting circuit may be configured to limit an audio signal received at an input and to provide it as a limited audio signal at an output. The power amplifier may have a supply connection which may be coupled to a power supply unit in order to supply power to the power amplifier. The power amplifier may be configured to amplify a signal, which may be based on the limited audio signal, and to provide it as a level-limited audio signal at an output which may be coupled to a load, so that the load may be operated at limited power. The signal limiting circuit may be configured to produce an audio signal which may be limited depending on the load.
摘要翻译：音频放大器可以包括信号限制电路和功率放大器。信号限制电路可以被配置为限制在输入处接收的音频信号，并将其提供为输出处的有限音频信号。功率放大器可以具有可以耦合到电源单元的供电连接，以向功率放大器供电。功率放大器可以被配置为放大可以基于受限音频信号的信号，并且将其提供为可以耦合到负载的输出处的电平限制音频信号，使得负载可以被操作在有限的权力。信号限制电路可以被配置为产生根据负载可能受到限制的音频信号。

5. 发明授权

US4812780A Broadband differential amplifier 失效
标题翻译：宽带差分放大器
公开(公告)号：US4812780A
公开(公告)日：1989-03-14
申请号：US166142
申请日：1988-03-10
申请人： Dale E. Zimmerman
发明人： Dale E. Zimmerman
IPC分类号： H03F3/45 , H03F13/00
CPC分类号： H03F3/45076 , H03F13/00
摘要： A differential amplifier (230) with input differential dual gate FETs (232,234) with one pair of gates (235,237) tied together, with sources tied together, and with a current source (236,238) for each of the FETs and inputs at the current source terminals is disclosed. These amplifiers provide large CMRR at frequencies to a few GHz, and fabrication in gallium arsenide is disclosed. A push-pull single-ended output stage provides good power handling and VSWR.
摘要翻译：具有输入差分双栅极FET（232,234）的差分放大器（232,234），其中一对栅极（235,237）连接在一起，源极连接在一起，并且具有用于每个FET的电流源（236,238）和电流源的输入端子被公开。这些放大器提供频率到几GHz的大CMRR，并且公开了砷化镓中的制造。推挽单端输出级提供良好的功率处理和VSWR。

6. 发明授权

US4471255A Surface acoustic wave parametric device 失效
标题翻译：表面声波参数装置
公开(公告)号：US4471255A
公开(公告)日：1984-09-11
申请号：US201127
申请日：1980-10-27
申请人： Nobuo Mikoshiba , Shoichi Minagawa
发明人： Nobuo Mikoshiba , Shoichi Minagawa
IPC分类号： H03F7/04 , H03F13/00 , H03H9/72
CPC分类号： H03F13/00 , H03F7/04
摘要： An surface acoustic wave device, especially amplifier which includes input and output means for electrical signals provided so as to be spaced on a surface of a piezoelectric material which comprises a laminate in combination with a semiconductor, and an electrode provided in a surface signal wave propagation path between said input and output means for supplying pumping power.
摘要翻译：一种表面声波装置，特别是放大器，其包括用于电信号的输入和输出装置，所述输入和输出装置设置成在压电材料的表面上间隔开，所述压电材料的表面包括与半导体组合的层压板和设置在表面信号波传播中的电极所述输入和输出装置之间的路径用于提供泵送功率。

7. 发明授权

US4088969A Tapped surface acoustic wave delay line 失效
标题翻译：敲击表面声波延迟线
公开(公告)号：US4088969A
公开(公告)日：1978-05-09
申请号：US788874
申请日：1977-04-19
申请人： James D. Crowley , Joseph F. Weller , Thomas G. Giallorenzi
发明人： James D. Crowley , Joseph F. Weller , Thomas G. Giallorenzi
IPC分类号： G10K11/36 , H03F13/00 , H03H9/42 , H03H9/30 , H01L45/02 , H03F3/04 , H03F3/55
CPC分类号： H03F13/00 , G10K11/36 , H03H9/423
摘要： A tapped surface acoustic wave (SAW) delay line with time-resolved outputssing piezoelectric leaky wave coupling and bulk wave amplification, and having low loss characteristics. A solid piezoelectric semiconductor is placed adjacent to a solid piezoelectric substrate. A pulsed rf input signal is applied to interdigital transducers (IDT) on the substrate. The applied signal launches a SAW in the substrate in a direction parallel to the interface between the substrate and the piezoelectric semiconductor solid. Upon reaching the interface, the SAW is piezoelectrically leaky-wave coupled across an air gap to a bulk acoustic wave in the piezoelectric semiconductor. Reflections of the bulk wave occur at both surfaces of the piezoelectric semiconductor, and piezoelectrically couples back across the air gap to excite a SAW on the piezoelectric substrate. The resultant rf output includes the normal delayed SAW pulse and additional delayed and time-resolved pulses. The amplitude of the bulk wave may be increased using bulk wave amplification.
摘要翻译：具有时间分辨输出的抽头声表面波（SAW）延迟线，采用压电泄漏波耦合和体波放大，具有低损耗特性。将固体压电半导体放置成与固体压电基板相邻。脉冲rf输入信号被施加到基板上的指数间换能器（IDT）。所施加的信号在平行于衬底和压电半导体固体之间的界面的方向上在衬底中发射SAW。在到达界面时，SAW在压电半导体中横跨气隙压电泄漏波耦合到体声波。体波的反射发生在压电半导体的两个表面，并且压电耦合回穿过气隙，以激发压电衬底上的SAW。所得到的rf输出包括正常延迟的SAW脉冲和附加的延迟和时间分辨脉冲。可以使用体波放大来增加体波的幅度。

8. 发明授权

US3909741A Acoustic transducer with direct current output 失效
标题翻译：具有直流输出的声学传感器
公开(公告)号：US3909741A
公开(公告)日：1975-09-30
申请号：US52056874
申请日：1974-11-04
申请人： GEN ELECTRIC
发明人： HARRIS LAWRENCE A
IPC分类号： H03F13/00 , H03F3/04
CPC分类号： H03F13/00
摘要： An acoustic transducer which produces a direct current output signal suitable for capacitive storage is described. Incident acoustic energy is converted to a surface wave in a piezoelectric rod. A first slab of semiconductor material lying in close proximity to the surface of the rod forms a traveling wave amplifier. Energy is coupled from the amplifier bias circuit to the surface wave. A second slab of semiconductor material lying proximate to the piezoelectric rod forms a traveling wave attenuator. Energy coupled from the surface wave to the attenuator changes the conductivity of the second semiconductor slab. Direct current flow in the attenuator bias circuit varies in proportion to the incident acoustic wave intensity. In a second embodiment a reference surface wave is mixed with the output of the traveling wave amplifier. The piezoelectric rod is stressed into a non-linear region producing a direct current output signal which is proportional to the intensity of the incident acoustic energy.
摘要翻译：描述了产生适合电容存储的直流输出信号的声换能器。入射声能被转换为压电杆中的表面波。靠近杆表面的第一半导体材料板形成行波放大器。能量从放大器偏置电路耦合到表面波。靠近压电杆的第二半导体材料板形成行波衰减器。从表面波耦合到衰减器的能量改变了第二半导体板的导电性。衰减器偏置电路中的直流电流与入射的声波强度成比例地变化。

9. 发明授权

US3731214A Generation of weakly damped electron plasma surface waves on a semiconductor: amplification and coupling of acoustic waves on an adjacent piezoelectric 失效
标题翻译：半导体上弱电子等离子体表面波的产生：相邻压电的声波的放大和耦合
公开(公告)号：US3731214A
公开(公告)日：1973-05-01
申请号：US3731214D
申请日：1971-04-16
申请人： MASSACHUSETTS INST TECHNOLOGY
发明人： BERS A
IPC分类号： H03F13/00 , H03F3/04
CPC分类号： H03F13/00
摘要： Conduction electrons in a semiconductor which is subjected to an applied electric drift field and magnetic field are excited to give rise to a weakly damped electron plasma surface wave carrying negative or positive energy depending upon the direction of the applied magnetic field. Acoustic waves traveling along the surface of an adjacent piezoelectric are resonantly amplified and coupled to the electron surface waves.
摘要翻译：受到施加的电漂移场和磁场的半导体中的传导电子被激发，以产生根据施加的磁场的方向承载负或正的能量的弱阻尼电子等离子体表面波。沿相邻压电体表面行进的声波被共振放大并耦合到电子表面波。

10. 发明授权

US3686579A Solid-state, acoustic-wave amplifiers 失效
标题翻译：固态，声波放大器
公开(公告)号：US3686579A
公开(公告)日：1972-08-22
申请号：US3686579D
申请日：1971-06-21
申请人： ZENITH RADIO CORP
发明人： EVERETT PETER G
IPC分类号： H03F13/00 , H03F3/04
CPC分类号： H03F13/00
摘要： In a signal amplifier, an input transducer launches acoustic surface waves at a given velocity along a predetermined path on a piezoelectric substrate. An output transducer responds to those waves for developing an output signal. A film of semi-conductive material between the input and output transducers responds to a unidirectional potential for conducting charge carriers alongside the propagation path at a velocity slightly greater than the acoustic wave velocity to achieve a amplification of the acoustic surface waves. Finally, a unidirectional field is applied transversely through the semi-conductive film to control the density of the charge carriers and the amplification.
摘要翻译：在信号放大器中，输入传感器沿着压电衬底上的预定路径以给定速度发射声表面波。输出传感器响应于这些波形用于开发输出信号。在输入和输出换能器之间的半导电材料薄膜响应单向电势，用于以稍大于声波速度的速度沿着传播路径传导载流子，以实现声表面波的放大。最后，横向通过半导体膜施加单向场，以控制电荷载流子的密度和放大。

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