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    • 4. 发明授权
    • Fully balanced transimpedance amplifier for high speed and low voltage applications
    • 用于高速和低电压应用的全平衡跨阻放大器
    • US06433638B1
    • 2002-08-13
    • US09655816
    • 2000-09-06
    • Randolph B. HeinekeScott Allen OlsonDavid Peter SwartGerald Wayne Swift
    • Randolph B. HeinekeScott Allen OlsonDavid Peter SwartGerald Wayne Swift
    • H03F345
    • H03F3/082H03F1/226H03F3/45376H03F2203/45394H03F2203/45511H03F2203/45518H03F2203/45528H03F2203/45652H03F2203/45711
    • A fully balanced transimpedance amplifier for high speed and low voltage applications is provided. An input stage of the amplifier uses a matched pair of common source connected transistors with sources tied directly to ground to eliminate the Vds overhead usually found in differential pairs. The ground connection minimizes a source resistance noise component, while matching minimizes power supply noise generation and susceptibility for an array of amplifiers. Feedback resistors along with diode connected MESFETS determine the transimpedance of the amplifier. The nonlinearity of diodes helps to soften clipping. Transresistance also determined the noise generated by the amplifier, and the diode connected MESFETS offer lower noise than resistors for the same impedance. Stability is achieved through use of only a single stage of gain in a loop of the input stage, while additional gain is achieved through cascading in the input stage. A differential stage minimizes any difference in amplitude between two sides of the amplifier input stage. Two stages of source followers provide buffering to drive a relatively low impedance load at the output of the amplifier. Single integrated capacitor coupling, for high bandwidth, low noise, low voltage operation with an integrated detector is provided.
    • 提供了用于高速和低电压应用的完全平衡的跨阻抗放大器。 放大器的输入级使用一对公共源极连接的晶体管,源极直接与地相连,以消除通常在差分对中发现的Vds开销。 接地连接最小化源电阻噪声分量,同时匹配可最大限度地减少放大器阵列的电源噪声产生和敏感性。 反馈电阻和二极管连接的MESFETS决定了放大器的跨导阻抗。 二极管的非线性有助于软化削波。 Transresistance还确定了放大器产生的噪声,并且连接的二极管MESFETS的阻抗比同一阻抗的电阻低。 通过在输入级的环路中仅使用单级增益实现稳定性,而在输入级中通过级联实现附加增益。 差分级使放大器输入级两侧之间的幅度差异最小化。 源级跟随器的两级提供缓冲以在放大器的输出处驱动相对较低的阻抗负载。 提供单集成电容耦合,用于高带宽,低噪声,低电压操作与集成检测器。
    • 6. 发明授权
    • Transducer head skew arrangement for disk drive system
    • 用于磁盘驱动系统的传动头螺钉安装
    • US5193036A
    • 1993-03-09
    • US591910
    • 1990-10-02
    • Martin R. GreenRandolph B. HeinekeJohn J. Stephenson
    • Martin R. GreenRandolph B. HeinekeJohn J. Stephenson
    • G11B5/48G11B19/02G11B19/20G11B20/12G11B21/08G11B21/10
    • G11B19/20G11B19/02G11B21/083
    • A transducer head skew arrangement used in a multiple disk drive data storage system is provided. The disk drive unit includes a plurality of magnetic disk surfaces mounted for simultaneous rotation about an axis. A first sequence of servo information tracks are arrayed on a dedicated servo disk surface. At least one servo reference track is written on each data disk surface for storing servo reference information. The servo reference track is written on a first data disk surface aligned with a predefined servo information track on the dedicated servo disk surface. Then servo reference tracks are sequentially written on each successive consecutive data disk surface progressively offset radially from the last written servo reference track. A plurality of data information tracks for storing data are disposed at predetermined positions relative to the servo reference track on each the data disk surface. A servo transducer head is mounted for movement in a radial direction across the first dedicated servo information for reading servo information; and a plurality of data transducer heads are mounted for movement with the servo transducer head in a radial direction across the disk surfaces for reading the servo reference tracks and for reading and/or writing data to the data information tracks. The distance moved by transducer heads for a cylinder switch is the same distance moved for each head switch, so that track-to-track seek time is minimized without requiring any additional time delay for each head switch. An overall data transfer rate increases for every data transfer accessing more than one data cylinder.
    • 7. 发明授权
    • Detector for short wave fiber optic communications with compensation to reduce detector jitter
    • 用于短波光纤通信的检测器,具有补偿功能,可减少检测器抖动
    • US06919550B2
    • 2005-07-19
    • US09994229
    • 2001-11-27
    • Randolph B. HeinekeDavid John Orser
    • Randolph B. HeinekeDavid John Orser
    • H04B10/158H01J40/14
    • H04B10/69
    • A detector is provided for short wave fiber optic communication having compensation to reduce detector jitter. The detector includes a photodetector providing a modulated current. A transimpedance amplifier is coupled to the photodetector receiving the modulated current and providing an output voltage signal. An output buffer is coupled to the transimpedance amplifier receiving the output voltage signal. The output buffer includes a differential transistor pair; a pair of source degeneration resistors connected to the differential transistor pair; and a capacitor coupled between connections of the differential transistor pair and the source degeneration resistors. The value of the capacitor coupled between connections of the differential transistor pair and the source degeneration resistors is selected to reduce jitter. The capacitor passes high slew rate transimpedance amplifier output voltage signals more readily than low slew rate transimpedance amplifier output voltage signals. The effect of the capacitor is to bypass the gain limiting effects of the source degeneration resistors. As a result the differential transistor pair accentuates high slew rates over lower ones so that detector jitter is reduced.
    • 为具有补偿以减少检测器抖动的短波光纤通信提供检测器。 检测器包括提供调制电流的光电检测器。 跨阻放大器耦合到接收调制电流并提供输出电压信号的光电检测器。 输出缓冲器耦合到接收输出电压信号的跨阻抗放大器。 输出缓冲器包括差分晶体管对; 连接到差分晶体管对的一对源极退化电阻; 以及耦合在差分晶体管对和源极退化电阻器的连接之间的电容器。 选择耦合在差分晶体管对的连接和源极退化电阻之间的电容器的值以减少抖动。 电容器比低转换速率跨阻放大器输出电压信号更容易地传递高压摆率跨阻放大器输出电压信号。 电容器的作用是绕过源极退化电阻的增益限制效应。 结果是,差分晶体管对突出了较低的压摆率,从而降低了检测器抖动。
    • 8. 发明授权
    • Fiber optic transceiver array and fiber optic transceiver channel for short wave fiber optic communications
    • US06985674B2
    • 2006-01-10
    • US09995108
    • 2001-11-27
    • Randolph B. HeinekeDavid John Orser
    • Randolph B. HeinekeDavid John Orser
    • H04B10/156
    • G01M11/30G02B6/4249
    • A fiber optic transceiver array and a fiber optic transceiver channel are provided for short wave fiber optic communications. A fiber optic transceiver array for short wave fiber optic communications includes a series of fiber optic transceiver channels. Each fiber optic transceiver channel includes a plurality of test pads. A power distribution bypass capacitor is distributed along the series of fiber optic transceiver channels. A plurality of high voltage power supply and ground connections are coupled through the power distribution bypass capacitor and distributed around the series of fiber optic transceiver channels. A threaded high voltage power supply connection is provided to alternating ones of the series of fiber optic transceiver channels. A threaded ground connection is provided to alternating other ones of the series of fiber optic transceiver channels to reduce power noise generation and susceptibility to noise between adjacent channels. A power to ground decoupling capacitor included with each fiber optic transceiver channel also enhances power noise sensitivity reduction. A fiber optic transceiver channel for short wave fiber optic communications includes at least a high voltage power supply connection and a ground connection. A plurality of test pads includes at least a ground connection and a pair of differential output connections. A channel decoupling capacitor is positioned proximate to the pair of differential output connections.
    • 10. 发明授权
    • Bipolar ring oscillator with enhanced startup and shutdown
    • US06515550B2
    • 2003-02-04
    • US09852494
    • 2001-05-10
    • Kevin Paul DemskyRandolph B. Heineke
    • Kevin Paul DemskyRandolph B. Heineke
    • H03L300
    • H03B5/06H03L3/00
    • A ring oscillator, such as a bipolar ring oscillator with enhanced, fast startup and shutdown includes a series of a plurality of inverting differential stages connected in a loop. The plurality of inverting differential stages includes a first multiplexer stage. The first multiplexer stage includes a first signal input, a second signal input and a select input. An oscillator feedback signal is applied to the first signal input of the first multiplexer stage. A startup circuit is coupled to the first multiplexer stage. The startup circuit includes a differential signal coupled to the second signal input of the first multiplexer stage for starting the bipolar ring oscillator. The startup circuit applies a full differential switching voltage signal to the second signal input of the first multiplexer stage to guarantee start of the bipolar ring oscillator after one delay of the series of the plurality of inverting differential stages connected in the loop. The startup circuit includes a fast transition run signal and a multiplexer select signal responsive to the run signal. The multiplexer select signal is coupled to the select input of the first multiplexer stage for controlling the first multiplexer stage to select the oscillator feedback signal or the static differential signal for stopping the bipolar ring oscillator.