Phase synchronization circuit and method therefor for a phase locked loop
    1.
    发明授权
    Phase synchronization circuit and method therefor for a phase locked loop 失效
    相位同步电路及其相位锁相环的方法

    公开(公告)号:US5497126A

    公开(公告)日:1996-03-05

    申请号:US149259

    申请日:1993-11-09

    IPC分类号: H03L3/00 H03L7/10 H03L7/18

    CPC分类号: H03L7/18 H03L3/00 H03L7/10

    摘要: An improved phase synchronization circuit (301) and method therefor for a phase locked loop (300). Each of a divided reference frequency signal (206) and a feedback signal (209) is held in a predetermined state. The divided reference frequency signal (206) is enabled responsive to the phase of a reference frequency signal (115). A phase relationship between the reference frequency signal (115) and an output frequency signal (116 or 117) is determined. The feedback signal (209) is enabled responsive to enabling the divided reference frequency signal (206) and the determined phase relationship. The present invention advantageously provides a rapid and accurate phase synchronization for the PLL (300) with minimum additional hardware and without introducing phase error into the PLL (300).

    摘要翻译: 一种用于锁相环(300)的改进的相位同步电路(301)及其方法。 划分的参考频率信号(206)和反馈信号(209)中的每一个被保持在预定状态。 分频参考频率信号(206)能够响应于参考频率信号(115)的相位被使能。 确定参考频率信号(115)和输出频率信号(116或117)之间的相位关系。 响应于启用分割的参考频率信号(206)和所确定的相位关系,反馈信号(209)被启用。 本发明有利地提供具有最小附加硬件的PLL(300)的快速和准确的相位同步,并且不将相位误差引入到PLL(300)中。

    Current mirror having increased output swing
    2.
    发明授权
    Current mirror having increased output swing 失效
    电流镜具有增加的输出摆幅

    公开(公告)号:US5142696A

    公开(公告)日:1992-08-25

    申请号:US686213

    申请日:1991-04-16

    IPC分类号: G05F3/26

    CPC分类号: G05F3/267 G05F3/262

    摘要: A current mirror having improved turn-on and turn-off characteristics capable of operation an expanded voltage range. A cascode circuit comprising a portion of the current mirror is of a high characteristic impedance to increase thereby the voltages over which the current mirror may generate a constant current output. A switching circuit comprised of tandemly-positioned transistors having differing transistor characteristics decreases the transistor turn-on and turn-off times to enhance the characteristics of the current mirror.

    摘要翻译: 具有能够操作扩展电压范围的具有改进的导通和关断特性的电流镜。 包括电流镜的一部分的共源共栅电路具有高特性阻抗,从而增加电流镜可以产生恒定电流输出的电压。 由串联位置的具有不同晶体管特性的晶体管组成的开关电路减小了晶体管导通和关断时间,以增强电流镜的特性。

    Peak detector circuit
    3.
    发明授权
    Peak detector circuit 失效
    峰值检测电路

    公开(公告)号:US5969545A

    公开(公告)日:1999-10-19

    申请号:US12745

    申请日:1998-01-23

    IPC分类号: G01R19/04 G01R19/00

    CPC分类号: G01R19/04

    摘要: A peak detector circuit (100) includes an output transconductance amplifier (102), a current rectifier (104) and an averaging circuit (108). The current rectifier includes an amplifier (115) which reduces input impedance of the current rectifier to increase the operating frequency of the peak detector circuit. An isolator (106) employs a current mirror (509) with a cascode transistor (512) having a bias potential which is dynamically adjusted to achieve accurate mirroring. An amplifier of a common mode feedback circuit (110) has improved linearity.

    摘要翻译: 峰值检测器电路(100)包括输出跨导放大器(102),电流整流器(104)和平均电路(108)。 电流整流器包括放大器(115),其减小电流整流器的输入阻抗以增加峰值检测器电路的工作频率。 隔离器(106)使用具有偏置电位的共源共栅晶体管(512)的电流镜(509),该偏置电位被动态调整以实现准确的镜像。 共模反馈电路(110)的放大器具有改善的线性度。

    Operational transconductance amplifier track and hold system
    4.
    发明授权
    Operational transconductance amplifier track and hold system 失效
    操作跨导放大器跟踪和保持系统

    公开(公告)号:US5483687A

    公开(公告)日:1996-01-09

    申请号:US149592

    申请日:1993-11-10

    IPC分类号: H03J1/00 H04B1/26 H04B1/18

    CPC分类号: H03J1/005 H04B1/26

    摘要: A voltage track and hold circuit operates to track a tuning voltage and holding the tuning voltage (404) as a reference voltage (408). In the track mode, the track and hold circuit includes a first operational transconductance amplifier (401) and a first charge storage device (402) coupled to a first input (403) of the first operational transconductance amplifier (401). The first charge storage device (402) accumulates a charge that corresponds with the tuning voltage (404). A second charge storage device (405) is coupled to a second input (406) and an output (407) of the first operational transconductance amplifier (401). The second charge storage device (405) accumulates a reference charge such that the reference voltage (408) present at the second charge storage device (405) is substantially equivalent to the tuning voltage (404).

    摘要翻译: 电压跟踪和保持电路用于跟踪调谐电压并保持调谐电压(404)作为参考电压(408)。 在轨道模式中,轨道和保持电路包括耦合到第一运算跨导放大器(401)的第一输入(403)的第一运算跨导放大器(401)和第一电荷存储装置(402)。 第一电荷存储装置(402)累积与调谐电压对应的电荷(404)。 第二电荷存储装置(405)耦合到第一运算跨导放大器(401)的第二输入端(406)和输出端(407)。 第二电荷存储装置(405)累积参考电荷,使得存在于第二电荷存储装置(405)处的参考电压(408)基本上等于调谐电压(404)。