公开(公告)号：US20130314151A1

公开(公告)日：2013-11-28

申请号：US13854707

申请日：2013-04-01

Applicant: Wolfson Microelectronics Plc

Inventor： John P. Lesso

IPC: H02M3/07

CPC classification number: H02M3/07 ,  H02M2003/072

Abstract: A charge pump circuit, and associated method and apparatuses, for providing a split-rail voltage supply, the circuit having a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of said states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage and centered on the voltage at the common terminal.

Abstract translation: 一种电荷泵电路及相关的方法和装置，用于提供分路电压电源，所述电路具有可在多个不同状态下操作的开关网络和用于以所述状态的顺序操作所述开关的控制器 以将正和负输出电压一起产生，跨越大约等于输入电压的电压并以公共端的电压为中心。

公开(公告)号：US08581356B2

公开(公告)日：2013-11-12

申请号：US12649541

申请日：2009-12-30

Applicant: John Laurence Pennock

Inventor： John Laurence Pennock

IPC: H01L29/84

CPC classification number: H01L29/861 ,  H04R2201/003

Abstract: Semiconductor structures with high impedances for use in biasing for applying voltage bias to part of a device. The semiconductor structure comprises a continuous structure having a plurality of regions of a first semiconductor type (n type or p type) material arranged alternately with at least one region of the opposite type. The structure may be formed from polysilicon and may also include a plurality of intrinsic regions arranged between the n and p type regions. The structure forms a composite diode and provides a high impedance.

Abstract translation: 具有高阻抗的半导体结构，用于将偏置电压施加到器件的一部分。 半导体结构包括具有交替设置有相反类型的至少一个区域的第一半导体型（n型或p型）材料的多个区域的连续结构。 该结构可以由多晶硅形成，并且还可以包括布置在n型和p型区之间的多个本征区。 该结构形成复合二极管并提供高阻抗。

公开(公告)号：US20130256816A1

公开(公告)日：2013-10-03

申请号：US13902344

申请日：2013-05-24

Applicant: Wolfson Microelectronics plc

Inventor： Anthony Bernard Traynor ,  Richard Ian Laming ,  Tsjerk Hans Hoekstra

IPC: B81B3/00

CPC classification number: H04R19/04 ,  B81B3/0021 ,  B81B3/0072 ,  B81B3/0094 ,  B81B2201/00 ,  B81B2201/0235 ,  B81B2201/0257 ,  B81B2201/0264 ,  H01L27/00 ,  H04R19/00 ,  H04R19/005 ,  H04R23/00 ,  H04R31/00 ,  H04R2499/11

Abstract: A method of fabricating a micro-electrical-mechanical system (MEMS) transducer comprises the steps of forming a membrane on a substrate, and forming a back-volume in the substrate. The step of forming a back-volume in the substrate comprises the steps of forming a first back-volume portion and a second back-volume portion, the first back-volume portion being separated from the second back-volume portion by a step in a sidewall of the back-volume. The cross-sectional area of the second back-volume portion can be made greater than the cross-sectional area of the membrane, thereby enabling the back-volume to be increased without being constrained by the cross-sectional area of the membrane. The back-volume may comprise a third back-volume portion. The third back-volume portion enables the effective diameter of the membrane to be formed more accurately.

Abstract translation: 制造微机电系统（MEMS）换能器的方法包括以下步骤：在衬底上形成膜，并在衬底中形成后体积。 在基板中形成后部体积的步骤包括以下步骤：形成第一后部体积部分和第二背部体积部分，第一后部体积部分与第二背部体积部分分离， 背部体积的侧壁。 第二后部容积部分的横截面面积可以大于膜的横截面面积，从而能够增加后部体积，而不受膜的横截面面积的约束。 背部容积可以包括第三后部体积部分。 第三后部体积部分能够更准确地形成膜的有效直径。

公开(公告)号：US20130237285A1

公开(公告)日：2013-09-12

申请号：US13869726

申请日：2013-04-24

Applicant: WOLFSON MICROELECTRONICS PLC

Inventor： David Sinai

IPC: H04M1/02

CPC classification number: G10L19/008 ,  G06F3/162 ,  H03M1/12 ,  H03M1/66 ,  H04B7/2653 ,  H04B7/2659 ,  H04L5/14 ,  H04M1/0202

Abstract: A wireless cellular telephone with an audio codec for converting digital audio signals to analog audio signals. The audio codec comprises two digital audio bus interfaces for coupling to respective digital audio buses, and a digital-only signal path between the two digital audio bus interfaces, such that no analog processing of the audio signals occurs in the digital-only signal path.

公开(公告)号：US08513933B2

公开(公告)日：2013-08-20

申请号：US12841688

申请日：2010-07-22

Applicant: Andrew Notman ,  Mark McCloy-Stevens

Inventor： Andrew Notman ,  Mark McCloy-Stevens

IPC: G05F1/565 ,  G05F1/595

CPC classification number: H02M3/1588 ,  H02M1/38 ,  H02M2001/0009 ,  H02M2001/0032 ,  Y02B70/1466

Abstract: Methods and apparatus for control of DC-DC converters. The DC-DC converter is operable so that the low side supply switch may be inhibited from turning on in a cycle following the high side supply switch turning off. Turn on of the low side switch is inhibited if the time between turn off of the high side switch and the inductor (L) current reaching zero is less than a predetermined duration. Inhibiting the low side switch from turning on can prevent the inductor current from going negative, which would reduce the efficiency of the converter. When turn on of the low side switch is inhibited the inductor current flows through a parallel path, such as a parasitic body diode associated with the low side switch, which allows current flow in one direction only.

Abstract translation: 用于控制DC-DC转换器的方法和装置。 DC-DC转换器可操作，使得可以在高侧供电开关关闭之后的一个周期内禁止低侧供电开关导通。 如果高侧开关的关断与电感（L）电流达到零之间的时间小于预定的持续时间，低压开关的导通将被禁止。 抑制低端开关导通可以防止电感电流变负，从而降低转换器的效率。 当低侧开关的导通被禁止时，电感器电流流过并联路径，例如与低侧开关相关联的寄生体二极管，其允许电流仅在一个方向上流动。

公开(公告)号：US08373506B2

公开(公告)日：2013-02-12

申请号：US12759900

申请日：2010-04-14

Applicant: John Paul Lesso ,  John Laurence Pennock ,  Peter John Frith

Inventor： John Paul Lesso ,  John Laurence Pennock ,  Peter John Frith

IPC: H03F3/04

CPC classification number: H02M3/07 ,  H03F1/025 ,  H03F3/185 ,  H03F3/187 ,  H03F3/68 ,  H03F2200/507 ,  H03F2200/511 ,  H03G1/0017 ,  H03G1/0029 ,  H03G1/0088 ,  H03G1/0094

Abstract: A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control signal; an output stage within the signal path for generating the output signal, the output stage having a gain that is substantially independent of its supply voltage, and a variable voltage power supply comprising a charge pump for providing positive and negative output voltages, the charge pump comprising a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of the states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage.

Abstract translation: 一种信号放大电路及相关的方法和装置，所述电路包括：从输入端延伸到输出端的信号路径;增益控制器，被配置为响应于控制信号控制沿信号路径施加的增益; 用于产生输出信号的信号路径内的输出级，输出级具有基本上与其电源电压无关的增益;以及可变电压电源，包括用于提供正和负输出电压的电荷泵，所述电荷泵包括 可操作于多个不同状态的开关网络和用于以一系列状态操作开关的控制器，以便将跨越大致等于输入电压的电压产生正和负输出电压。

公开(公告)号：US08208658B2

公开(公告)日：2012-06-26

申请号：US11892641

申请日：2007-08-24

Applicant: Tahir Rashid ,  Mark Childs

Inventor： Tahir Rashid ,  Mark Childs

IPC: H04B15/00

CPC classification number: H03G3/348 ,  H03F1/305 ,  H03F3/181 ,  H03F3/45475 ,  H03F2200/03 ,  H03F2203/45138

Abstract: An amplifier power-down apparatus for suppressing transient signals in a circuit, for example an audio circuit, comprising a reference voltage generator circuit for generating a reference voltage. The reference voltage generator circuit comprises a capacitor for maintaining the reference voltage at a desired level. The amplifier power-down apparatus comprises a discharge control circuit for controlling the operation of the reference voltage generator circuit during power-down. The discharge control circuit comprises an amplifier with a positive feedback path for controlling a current flow from the capacitor during power-down.

Abstract translation: 一种用于抑制电路（例如音频电路）中的瞬态信号的放大器降压装置，包括用于产生参考电压的参考电压发生器电路。 参考电压发生器电路包括用于将参考电压保持在期望电平的电容器。 放大器断电装置包括用于在断电期间控制参考电压发生器电路的操作的放电控制电路。 放电控制电路包括具有正反馈路径的放大器，用于在断电期间控制来自电容器的电流。

公开(公告)号：US08204251B2

公开(公告)日：2012-06-19

申请号：US11892642

申请日：2007-08-24

Applicant: Tahir Rashid

Inventor： Tahir Rashid

IPC: H04B15/00

CPC classification number: H03F1/305 ,  H03F1/342 ,  H03F3/181 ,  H03F3/68 ,  H03F2200/03 ,  H03F2200/372 ,  H03F2200/507

Abstract: An amplifier start-up apparatus for reducing transient signals in a circuit, for example an audio circuit, comprising a reference voltage generator circuit for generating a reference voltage. The reference voltage generator circuit comprises a capacitor for maintaining the reference voltage at a desired level. The amplifier start-up apparatus comprises a control circuit for controlling the operation of the reference voltage generator circuit during power-up. The control circuit comprises an amplifier with a positive feedback path for controlling a current flow to the capacitor.

Abstract translation: 一种用于减少电路中的瞬态信号的放大器启动装置，例如音频电路，包括用于产生参考电压的参考电压发生器电路。 参考电压发生器电路包括用于将参考电压保持在期望电平的电容器。 放大器启动装置包括用于在加电期间控制参考电压发生器电路的操作的控制电路。 控制电路包括具有用于控制到电容器的电流的正反馈路径的放大器。

公开(公告)号：US07994763B2

公开(公告)日：2011-08-09

申请号：US12615291

申请日：2009-11-10

Applicant: John Paul Lesso ,  John L. Pennock

Inventor： John Paul Lesso ,  John L. Pennock

IPC: G05F1/40

CPC classification number: H02M3/1582 ,  H02M3/158 ,  H02M3/33561

Abstract: Electrical power from an input voltage supply is converted to first and second output voltages of opposite polarities using a single inductor (L) and only four principal switches (S1, S2, S4, S6). In contrast to known circuits, none of the switches is exposed to voltages greater than the input voltage (V1). In a first type of charging cycle (FIG. 5(a)-(c)), the first output voltage (V2+) is obtained from the input voltage supply through the inductor. In a second type of charging cycle (FIG. 5 (d)-(f)), the second output voltage (V2−) is obtained from the first output voltage via the intermediate step of storing energy in the same inductor as is used in the first type of charging cycle. Auxiliary switches (S7a, S7b) can be operated in wait states between cycles of the first and second type.

Abstract translation: 使用单个电感器（L）和仅四个主开关（S1，S2，S4，S6）将来自输入电压源的电力转换为具有相反极性的第一和第二输出电压。 与已知的电路相比，没有一个开关暴露于大于输入电压（V1）的电压。 在第一种充电周期（图5（a） - （c））中，从通过电感器的输入电压源获得第一输出电压（V2 +）。 在第二种类型的充电周期（图5（d） - （f））中，通过中间步骤从第一输出电压获得第二输出电压（V2-），该中间步骤将能量存储在与 第一种充电周期。 辅助开关（S7a，S7b）可在第一和第二类型的周期之间以等待状态运行。

公开(公告)号：US07884557B2

公开(公告)日：2011-02-08

申请号：US11822831

申请日：2007-07-10

Applicant: Colin Steele ,  Catherine A. Hearne ,  David P. Singleton

Inventor： Colin Steele ,  Catherine A. Hearne ,  David P. Singleton

IPC: G05F1/00

CPC classification number: H05B33/089 ,  H05B33/0818 ,  H05B33/0857 ,  Y02B20/341

Abstract: A light source is protected by selectively coupling a shunt path in parallel with the light source, such that current is diverted away from the light source and through the shunt path. A detection circuit detects the current flowing in the shunt path when the shunt path is connected in parallel with the light source. A comparator determines whether the current flowing in the shunt path exceeds a predetermined threshold and, if so, prevents or limits the flow of current when the shunt path is disconnected from being in parallel with the light source. In this way, a current detector is provided for monitoring the flow of current in a shunt path, the current detector being configured to disable or limit the flow of current through a light source when a predetermined threshold is reached. This aspect of the invention has the advantage of enabling the current flowing through a light source to be controlled by monitoring the current in the shunt path rather than the path having the light source, thus enabling the maximum current to be controlled without potentially damaging the light source.

Abstract translation: 通过选择性地耦合与光源平行的分流路径来保护光源，使得电流被转移离开光源并且通过分流路径。 当并联路径与光源并联连接时，检测电路检测在分流路径中流动的电流。 比较器确定在分流路径中流动的电流是否超过预定阈值，如果是，则当分流路径被断开以与光源平行时，防止或限制电流流动。 以这种方式，提供电流检测器用于监视分流路径中的电流流动，电流检测器被配置为当达到预定阈值时禁用或限制通过光源的电流。 本发明的这个方面具有的优点是能够通过监视分流路径中的电流来控制流过光源的电流，而不是具有光源的路径，从而能够控制最大电流而不会潜在地损害光 资源。