公开(公告)号：US07511931B2

公开(公告)日：2009-03-31

申请号：US11761285

申请日：2007-06-11

Applicant: Alexander Fairgrieve

Inventor： Alexander Fairgrieve

IPC: H02H9/06 ,  H02H3/22

CPC classification number: H03K17/08142 ,  H03K17/08146 ,  H03K17/78

Abstract: A transistor for use in an output stage is selectively part of one of two different circuits, one circuit being an electrostatic discharge (ESD) clamp circuit, the other circuit being an output stage circuit. For example, the transistor can be selectively connected such that it is part of the ESD clamp circuit, e.g., when a load (e.g., laser diode) connected to a current path terminal (e.g., drain or collector) of the transistor is not to be driven by a drive circuit. However, when the load connected to the current path terminal of the transistor is to be driven by the drive circuit, the transistor can be connected such that it receives a drive signal at its control terminal, from the drive circuit. This abstract is not intended to describe all embodiments of the present invention.

Abstract translation: 用于输出级的晶体管是两个不同电路之一的一部分，一个电路是静电放电（ESD）钳位电路，另一个电路是输出级电路。 例如，可以选择性地连接晶体管，使其成为ESD钳位电路的一部分，例如，当连接到晶体管的电流路径端子（例如，漏极或集电极）的负载（例如，激光二极管）不是 由驱动电路驱动。 然而，当连接到晶体管的电流通路端子的负载将被驱动电路驱动时，晶体管可以被连接成使得其在其控制端从驱动电路接收驱动信号。 该摘要并不旨在描述本发明的所有实施例。

公开(公告)号：US07382807B2

公开(公告)日：2008-06-03

申请号：US11399976

申请日：2006-04-07

Applicant: Alexander Fairgrieve ,  D. Stuart Smith ,  Theodore D. Rees ,  Bill R. Tang

Inventor： Alexander Fairgrieve ,  D. Stuart Smith ,  Theodore D. Rees ,  Bill R. Tang

IPC: H01S3/30 ,  H01S3/13 ,  H01S3/00

CPC classification number: G11B7/1263 ,  H01S5/042 ,  H01S5/0683

Abstract: Methods and system are provided for automatic power control of a laser diode, e.g., in a laser driver. In accordance with an embodiment of the present invention, a power controller includes a detector circuit adapted to detect the output of the laser diode and to produce a measured output therefrom. A comparator compares a desired output to the measured output, and produces an error signal therefrom. The error signal is provided to an integrator circuit that produces an integrated error signal. At least one digital-to-analog converter (DAC) uses the integrated error signal to produce a current drive signal that drives the laser diode.

Abstract translation: 提供了用于例如激光驱动器中的激光二极管的自动功率控制的方法和系统。 根据本发明的实施例，功率控制器包括检测器电路，其适于检测激光二极管的输出并从其产生测量的输出。 比较器将期望的输出与测量的输出进行比较，并从其产生误差信号。 该误差信号被提供给产生积分误差信号的积分器电路。 至少一个数模转换器（DAC）使用积分误差信号来产生驱动激光二极管的电流驱动信号。

公开(公告)号：US20080030910A1

公开(公告)日：2008-02-07

申请号：US11761285

申请日：2007-06-11

Applicant: Alexander Fairgrieve

Inventor： Alexander Fairgrieve

IPC: H02H9/00 ,  H02H3/00

CPC classification number: H03K17/08142 ,  H03K17/08146 ,  H03K17/78

Abstract: A transistor for use in an output stage is selectively part of one of two different circuits, one circuit being an electrostatic discharge (ESD) clamp circuit, the other circuit being an output stage circuit. For example, the transistor can be selectively connected such that it is part of the ESD clamp circuit, e.g., when a load (e.g., laser diode) connected to a current path terminal (e.g., drain or collector) of the transistor is not to be driven by a drive circuit. However, when the load connected to the current path terminal of the transistor is to be driven by the drive circuit, the transistor can be connected such that it receives a drive signal at its control terminal, from the drive circuit. This abstract is not intended to describe all embodiments of the present invention.

Abstract translation: 用于输出级的晶体管是两个不同电路之一的一部分，一个电路是静电放电（ESD）钳位电路，另一个电路是输出级电路。 例如，可以选择性地连接晶体管，使其成为ESD钳位电路的一部分，例如，当连接到晶体管的电流路径端子（例如，漏极或集电极）的负载（例如，激光二极管）不是 由驱动电路驱动。 然而，当连接到晶体管的电流通路端子的负载将被驱动电路驱动时，晶体管可以被连接成使得它在其控制端从驱动电路接收驱动信号。 该摘要并不旨在描述本发明的所有实施例。

公开(公告)号：US5874865A

公开(公告)日：1999-02-23

申请号：US854517

申请日：1997-05-12

Applicant: Alexander Fairgrieve

Inventor： Alexander Fairgrieve

IPC: H03L5/00 ,  H03B5/00

CPC classification number: H03L5/00

Abstract: A variable frequency oscillator providing a constant amplitude with variations in frequency. The variable frequency oscillator includes: an oscillator having an input connected for receiving a current I.sub.1, and outputs for providing complementary signals having a frequency varying in proportion to the current I.sub.1 ; first and second transistors, each having a base connected to a respective one of the oscillator outputs; current supply circuitry having a first output connected to the input of the oscillator for providing the current I.sub.1, and a second output connected to the emitters of the first and second transistors for providing a current I.sub.3, the current I.sub.3 varying in proportion to the current I.sub.1, without varying significantly due to changes in the oscillator frequency; and first and second output amplifiers, each having an input connected to the collector of a respective one of the first and second transistors, and an output for providing a signal which varies in proportion to the current I.sub.3 and varies inversely proportion to the oscillator frequency. With such circuitry, variations in amplitude of signals driving the output amplifiers due to changes in oscillator frequency will cancel inverse variations in amplitude of signals at the outputs of the output amplifiers due to the changes in the oscillator frequency.

Abstract translation: 提供频率变化恒定幅度的可变频率振荡器。 可变频率振荡器包括：具有连接用于接收电流I1的输入的振荡器，以及用于提供具有与电流I1成比例的频率变化的互补信号的输出; 第一和第二晶体管，每个具有连接到相应的一个振荡器输出的基极; 电流供应电路具有连接到用于提供电流I1的振荡器的输入端的第一输出，以及连接到第一和第二晶体管的发射极的第二输出，用于提供电流I3，电流I3与电流I1成比例地变化 ，不会因振荡器频率的变化而明显变化; 以及第一和第二输出放大器，每个具有连接到第一和第二晶体管的相应一个的集电极的输入端和用于提供与电流I3成比例变化并与振荡器频率成反比变化的信号的输出端。 利用这样的电路，由于振荡器频率的变化，驱动输出放大器的信号的振幅变化将消除由于振荡器频率的变化而在输出放大器的输出处的信号幅度的反向变化。

公开(公告)号：US08384832B2

公开(公告)日：2013-02-26

申请号：US12844691

申请日：2010-07-27

Applicant: Alexander Fairgrieve ,  D. Stuart Smith

Inventor： Alexander Fairgrieve ,  D. Stuart Smith

IPC: H04N9/28

CPC classification number: H04N9/3173 ,  H04N9/312 ,  H04N9/3155

Abstract: Systems, methods and devices provide for fast and power efficient transfer of three color data words (e.g., a M-bit red color word, a M bit green color word and a M-bit blue color word) per pixel from a controller to a laser diode driver (LDD). First and second transfer words are produced based on the three color data words. The first transfer word is transferred from the controller to the LDD and stored at LDD in response to a low-to-high portion of a cycle of a data transfer clock, and the second transfer word is transferred and stored in response to a high-to-low portion of a cycle of the data transfer clock. The first, second and third color data words are reproduced by the LDD in dependence on the first and second received transfer words. First, second and third DACs of the LDD are driven with the first color data word, the second color data word, and the third color data word. Three light sources (e.g., red, green and blue laser diodes or LEDs) are driven with output currents of the DACs.

Abstract translation: 系统，方法和装置提供从控制器到每个像素的三色数据字（例如，M位红色字，M位绿色字和M位蓝色字）的快速和功率有效传输。 激光二极管驱动器（LDD）。 基于三色数据字产生第一和第二传送字。 第一传送字从控制器传送到LDD，并且响应于数据传输时钟的周期的低到高部分而存储在LDD处，并且响应于高速数据传送字符而传送和存储第二传送字， 数据传输时钟周期的低位部分。 第一，第二和第三颜色数据字由LDD根据第一和第二接收的传送字再现。 首先，利用第一颜色数据字，第二颜色数据字和第三颜色数据字来驱动LDD的第二和第三DAC。 三个光源（例如，红，绿和蓝激光二极管或LED）由DAC的输出电流驱动。

公开(公告)号：US07317674B2

公开(公告)日：2008-01-08

申请号：US10797261

申请日：2004-03-10

Applicant: Theodore D. Rees ,  Alexander Fairgrieve ,  Bill R. Tang ,  Barry Harvey ,  Yang Zhao

Inventor： Theodore D. Rees ,  Alexander Fairgrieve ,  Bill R. Tang ,  Barry Harvey ,  Yang Zhao

IPC: G11B7/12

CPC classification number: G11B7/1263 ,  G11B7/00456 ,  G11B7/123

Abstract: Optical pick-up units and laser drivers are disclosed, which can be used in various types of information recording/reproducing apparatuses, such as, but not limited to, DVD and CD drives, DVD camcorders, and DVD video recorders. A laser driver integrated circuit (LDIC) includes an automatic power controller, a running optical power controller, and a write strategy generator. The LDIC can be part of a chip-set, to be located on an optical pick-up unit (OPU). The chip-set can also include a power monitor integrated circuit (PMIC) to monitor the laser diode, and a photo-detector integrated circuit (PDIC) to detect light produced by the laser diode. The PMIC and the PDIC each include their own offset, gain and sample-and-hold circuitry.

Abstract translation: 公开了光拾取单元和激光驱动器，其可以用于各种类型的信息记录/再现装置，例如但不限于DVD和CD驱动器，DVD摄像机和DVD视频记录器。 激光驱动器集成电路（LDIC）包括自动功率控制器，运行光功率控制器和写策略发生器。 LDIC可以是芯片组的一部分，位于光学拾取单元（OPU）上。 芯片组还可以包括用于监视激光二极管的功率监视器集成电路（PMIC）和用于检测由激光二极管产生的光的光电检测器集成电路（PDIC）。 PMIC和PDIC各自包括它们自己的偏移，增益和采样保持电路。

公开(公告)号：US20060280089A1

公开(公告)日：2006-12-14

申请号：US11233193

申请日：2005-09-22

Applicant: Miguel Perez ,  Alexander Fairgrieve ,  Akihiro Asada

Inventor： Miguel Perez ,  Alexander Fairgrieve ,  Akihiro Asada

IPC: G11B5/09

CPC classification number: G11B7/00456 ,  G11B2007/0006

Abstract: Embodiments of the present invention relate to systems and methods for providing flexible multipulse strategies. In specific embodiments, a plurality of multipulse location registers are dedicated to storing multipulse location information. Each of a plurality of different mark-lengths that can result in at least one multipulse is mapped to one or more bit location within the multipulse location registers, such that a unique multipulse execution strategy can be defined for each of the plurality of different mark-lengths. Each bit location within the multipulse location registers can contain a first type of bit or a second type of bit. The first type of bit is used to indicate where to execute a multipulse, and the second type of bit is used to indicate where to not execute a multipulse. This abstract is not intended to be a complete description of the various embodiments of the present invention.

公开(公告)号：US07106769B2

公开(公告)日：2006-09-12

申请号：US10772051

申请日：2004-02-04

Applicant: Alexander Fairgrieve

Inventor： Alexander Fairgrieve

IPC: H01S3/00

CPC classification number: H01S5/06808 ,  H01S5/042

Abstract: Methods and systems and apparatuses for reducing power consumption, in an environment including a laser driver that drives a laser diode, are provided. The voltage drop across a laser diode, driven by a laser driver, is monitored. This enables a supply voltage, used to power the laser driver, to be appropriately adjusted, based at least in part on the monitored voltage drop. For example, the supply voltage is increased when the monitored voltage drop across the laser diode increases, and decreased when the monitored voltage drop across the laser diode decreases.

Abstract translation: 提供了在包括驱动激光二极管的激光驱动器的环境中降低功耗的方法和系统和装置。 监测由激光驱动器驱动的激光二极管上的电压降。 这使得能够至少部分地基于监视的电压降来适当地调整用于为激光驱动器供电的电源电压。 例如，当监控的激光二极管上的电压降增加时，电源电压就会增加，并且当激光二极管上监测到的电压降降低时，电源电压就会降低。

公开(公告)号：US07061951B2

公开(公告)日：2006-06-13

申请号：US10612579

申请日：2003-07-02

Applicant: Alexander Fairgrieve ,  D. Stuart Smith ,  Theodore D. Rees ,  Bill R. Tang

Inventor： Alexander Fairgrieve ,  D. Stuart Smith ,  Theodore D. Rees ,  Bill R. Tang

IPC: H01S3/00

CPC classification number: G11B7/1263 ,  H01S5/042 ,  H01S5/0683

Abstract: Methods and system are provided for automatic power control of a laser diode, e.g., in a laser driver. In accordance with an embodiment of the present invention, a power controller includes a detector circuit adapted to detect the output of the laser diode and to produce a measured output therefrom. A comparator compares a desired output to the measured output, and produces an error signal therefrom. The error signal is provided to an integrator circuit that produces an integrated error signal. At least one digital-to-analog converter (DAC) uses the integrated error signal to produce a current drive signal that drives the laser diode.

Abstract translation: 提供了用于例如激光驱动器中的激光二极管的自动功率控制的方法和系统。 根据本发明的实施例，功率控制器包括检测器电路，其适于检测激光二极管的输出并从其产生测量的输出。 比较器将期望的输出与测量的输出进行比较，并从其产生误差信号。 该误差信号被提供给产生积分误差信号的积分器电路。 至少一个数模转换器（DAC）使用积分误差信号来产生驱动激光二极管的电流驱动信号。

公开(公告)号：US5898334A

公开(公告)日：1999-04-27

申请号：US854376

申请日：1997-05-12

Applicant: Alexander Fairgrieve

Inventor： Alexander Fairgrieve

IPC: H03K17/62

CPC classification number: H03K17/16 ,  H03K17/62

Abstract: A circuit for generating an output signal used for driving a grounded load is provided. The circuit provides an output signal without glitches or spikes. The circuit also outputs a drive signal with enhanced responsiveness in transitioning from one output value level to another output value level. The circuit includes a plurality of control devices for providing respective output signals responsive to respective control signals. The base of a PNP transistor is coupled to the output of the control devices and acts as a buffer. The emitter of the PNP transistor is coupled to a voltage source and the collector is coupled to a grounded load for providing the drive current. Alternatively, an NPN transistor and current source provides the drive current to the grounded load. The circuitry may be used in an optical disk drive with the load and ground being a laser diode used for providing a laser beam in reading/writing an optical disk.

Abstract translation: 提供了用于产生用于驱动接地负载的输出信号的电路。 该电路提供输出信号，无毛刺或尖峰。 该电路还输出一个具有增强的响应能力的驱动信号，从一个输出值电平转换到另一个输出值电平。 电路包括多个控制装置，用于响应各个控制信号提供相应的输出信号。 PNP晶体管的基极耦合到控制器件的输出端并充当缓冲器。 PNP晶体管的发射极耦合到电压源，并且集电极耦合到接地负载以提供驱动电流。 或者，NPN晶体管和电流源将驱动电流提供给接地负载。 电路可以用在光盘驱动器中，其中负载和地是用于在读/写光盘中提供激光束的激光二极管。