Spurious-free fractional-N frequency synthesizer with multi-phase network circuit
    51.
    发明授权
    Spurious-free fractional-N frequency synthesizer with multi-phase network circuit 有权
    具有多相网络电路的无杂散分数N频率合成器

    公开(公告)号:US06642800B2

    公开(公告)日:2003-11-04

    申请号:US10116555

    申请日:2002-04-04

    IPC分类号: H03L706

    摘要: A spurious-free fractional-N frequency synthesizer circuit is disclosed. The synthesizer circuit includes a multi-phase network circuit operative to provide output signals that are at least a 1/(2n+1)) fractional version of the input signal. The synthesizer circuit includes a phase lock loop (PLL) circuit, with the multi-phase network circuit being coupled to the negative feedback loop of the PLL. The multi-phase network circuit includes a smoothing circuit that removes any jitter present at the output of the PLL.

    摘要翻译: 公开了一种无杂散分数N频率合成器电路。 合成器电路包括多相网络电路,其操作以提供输入信号的至少1 /(2n + 1))分数版本的输出信号。 合成器电路包括锁相环(PLL)电路,多相网络电路耦合到PLL的负反馈环路。 多相网络电路包括一个平滑电路,其消除存在于PLL输出端的任何抖动。

    Voltage supply discriminator and method
    52.
    发明授权
    Voltage supply discriminator and method 有权
    电压鉴别器及方法

    公开(公告)号:US06480051B2

    公开(公告)日:2002-11-12

    申请号:US09891931

    申请日:2001-06-26

    IPC分类号: H03L510

    CPC分类号: G06F1/263

    摘要: A voltage supply discriminator circuit senses multiple logic voltage supply levels and produces a plurality of control signals to select either or both of an output buffer circuit and/or an input buffer circuit that is coupled to a pad or pin. The discriminator circuit utilizes an input/output ring voltage supply and a reference voltage, such as a core voltage supply, to determine the appropriate circuitry to be used for the I/O pad. The appropriate circuitry is then automatically activated.

    摘要翻译: 电压鉴别器电路感测多个逻辑电压电平并产生多个控制信号,以选择耦合到焊盘或引脚的输出缓冲器电路和/或输入缓冲器电路中的一个或两者。 鉴频器电路利用输入/输出环电压电源和诸如核心电压源的参考电压来确定要用于I / O焊盘的适当电路。 然后自动激活适当的电路。

    Single gate oxide electrostatic discharge protection circuit
    53.
    发明授权
    Single gate oxide electrostatic discharge protection circuit 有权
    单栅氧化物静电放电保护电路

    公开(公告)号:US06459553B1

    公开(公告)日:2002-10-01

    申请号:US09272858

    申请日:1999-03-19

    IPC分类号: H02H900

    CPC分类号: H02H9/046 H01L27/0266

    摘要: An electrostatic discharge circuit utilizes a cascaded transistor configuration and a dual ESD protection circuit configuration. Preferably, the ESD protection circuits are made as a single gate oxide circuit. The protection circuit is effectively disabled during normal operation and allows a variable level voltage input to be applied during normal operation without damage to the cascaded transistors.

    摘要翻译: 静电放电电路采用级联晶体管配置和双ESD保护电路配置。 优选地,ESD保护电路被制成单个栅极氧化物电路。 保护电路在正常工作期间被有效地禁用,并且允许在正常操作期间施加可变电平电压输入而不损坏级联晶体管。

    Differential input receiver and method for reducing noise
    54.
    发明授权
    Differential input receiver and method for reducing noise 有权
    差分输入接收机和减少噪声的方法

    公开(公告)号:US06359485B1

    公开(公告)日:2002-03-19

    申请号:US09614084

    申请日:2000-07-11

    IPC分类号: H03K3286

    CPC分类号: H03K3/0377

    摘要: An integrated circuit and method utilizes a differential input receiver having a first input that receives an input signal. A reference voltage adjustment circuit produces a variable reference signal for the second input of a differential input receiver. A feedback path is provided from the output of the differential input receiver to an input of the reference voltage adjustment circuit. The reference voltage adjustment circuit dynamically varies the variable reference voltage signal to facilitate hysteresis. The variable reference voltage signal is lowered in the case of a high input signal, and raised in the case of a low input signal.

    摘要翻译: 集成电路和方法利用具有接收输入信号的第一输入的差分输入接收器。 参考电压调节电路产生用于差分输入接收器的第二输入的可变参考信号。 反馈路径从差分输入接收器的输出提供给参考电压调节电路的输入端。 参考电压调节电路动态​​地改变可变参考电压信号以便于滞后。 在高输入信号的情况下,可变参考电压信号降低,并且在低输入信号的情况下升高。

    Three level pre-buffer voltage level shifting circuit and method
    55.
    发明授权
    Three level pre-buffer voltage level shifting circuit and method 有权
    三级预缓冲电压电平转换电路及方法

    公开(公告)号:US06130557A

    公开(公告)日:2000-10-10

    申请号:US300365

    申请日:1999-04-26

    IPC分类号: H03K19/003 H03K19/0185

    摘要: A buffer circuit utilizes a single gate oxide pre-buffer voltage level shifting circuit on, for example, an output buffer of an I/O pad, to accommodate different I/O pad supply voltages while maintaining normal operating voltages (degradation levels) across boundaries of single gate oxide devices that form the buffer. The single gate oxide output buffer can operate at several different supply voltages. A pre-buffer voltage level shifting circuit includes a multi-supply voltage level shifting circuit having single gate oxide devices coupled to produce a pre-buffer output signal to an output buffer. A single gate oxide cross coupled active load is coupled to the multi-supply voltage level shifting circuit and provides suitable drive voltages to at least one of cascaded buffer transistors.

    摘要翻译: 缓冲电路在例如I / O焊盘的输出缓冲器上使用单栅极氧化物预缓冲器电压电平移位电路,以适应不同的I / O焊盘电源电压,同时保持跨越边界的正常工作电压(劣化电平) 的形成缓冲器的单栅极氧化物器件。 单栅极氧化物输出缓冲器可以在几种不同的电源电压下工作。 预缓冲器电压电平移位电路包括多电源电压移位电路,其具有耦合以产生到输出缓冲器的预缓冲器输出信号的单个栅极氧化器件。 单栅极氧化物交叉耦合有源负载耦合到多电源电压电平移位电路,并向级联缓冲晶体管中的至少一个提供合适的驱动电压。