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    • 5. 发明申请
    • TEMPERATURE COMPENSATION AND COARSE TUNE BANK SWITCHES IN A LOW PHASE NOISE VCO
    • 低相位噪声压控振荡器中的温度补偿和谐波调节银行开关
    • WO2012119123A2
    • 2012-09-07
    • PCT/US2012/027603
    • 2012-03-02
    • QUALCOMM INCORPORATEDZHANG, Gang
    • ZHANG, Gang
    • H03L7/099
    • H03L7/099H03L1/02H03L7/104
    • The LC tank of a VCO includes a main varactor circuit and temperature compensation varactor circuit coupled in parallel with the main varactor circuit. The main varactor is used for fine tuning. The temperature compensation varactor circuit has a capacitance- voltage characteristic that differs from a capacitance-voltage characteristic of the main varactor circuit such that the effects of common mode noise across the two varactor circuits are minimized. The LC tank also has a plurality of switchable capacitor circuits provided for coarse tuning. To prevent breakdown of the main thin oxide switch in each of the switchable capacitor circuits, each switchable capacitor circuit has a capacitive voltage divider circuit that reduces the voltage across the main thin oxide switch when the main switch is off.
    • VCO的LC箱包括与主变容二极管并联耦合的主变容二极管电路和温度补偿变容二极管电路。 主变容器用于微调。 温度补偿变容二极管的电容电压特性与主变容二极管电路的电容 - 电压特性不同,使两个变容二极管之间的共模噪声的影响最小化。 LC箱还具有用于粗调的多个可切换电容器电路。 为了防止每个可切换电容器电路中的主薄氧化物开关的破坏,每个可切换电容器电路具有电容分压器电路,当主开关断开时,电容分压电路降低主薄氧化物开关两端的电压。
    • 8. 发明申请
    • PHASE TO DIGITAL CONVERTER IN ALL DIGITAL PHASE LOCKED LOOP
    • 相位数字转换器在所有数字相位锁定环路
    • WO2009129258A1
    • 2009-10-22
    • PCT/US2009/040555
    • 2009-04-14
    • QUALCOMM INCORPORATEDZHANG, GangJAJOO, AbishekHAN, Yiping
    • ZHANG, GangJAJOO, AbishekHAN, Yiping
    • H03L7/085
    • H03L7/085H03L7/089H03L7/1976H03L2207/50
    • A phase to digital converter, all digital phase locked loop, and apparatus having an all digital phase locked loop are described herein. The phase to digital converter includes a phase to frequency converter driving a time to digital converter. The time to digital converter determines a magnitude and sign of the phase differences output by the phase to frequency converter. The time to digital converter utilizes tapped delay lines and looped feedback counters to enable measurement of small timing differences typical of a loop tracking process and large timing differences typical of an loop acquisition process. The tapped delay lines permit the measurement of fractions of a reference period and enable lower power operation of the phase to digital converter by reducing requirements on the speed of the reference clock.
    • 这里描述了一个相数转换器,全数字锁相环和具有全数字锁相环的装置。 相数转换器包括驱动时间到数字转换器的相位到频率转换器。 数字转换器的时间决定了相位变频器输出的相位差的大小和符号。 数字转换器的时间利用抽头延迟线和环路反馈计数器来测量环路跟踪过程中典型的小时序差异以及循环获取过程的典型时序差。 抽头延迟线允许测量参考周期的分数,并通过减少对参考时钟速度的要求,实现相位数字转换器的低功耗操作。
    • 9. 发明申请
    • DELTA-SIGMA MODULATOR CLOCK DITHERING IN A FRACTIONAL-N PHASE-LOCKED LOOP
    • DELTA-SIGMA调制器时钟在一个分段N相锁定环路
    • WO2009108815A1
    • 2009-09-03
    • PCT/US2009/035349
    • 2009-02-26
    • QUALCOMM IncorporatedXU, YangZHANG, GangGUDEM, Prasad S.
    • XU, YangZHANG, GangGUDEM, Prasad S.
    • H03L7/197
    • H03L7/1974
    • The clock signal supplied to the delta-sigma modulator in a fractional-N phase-locked loop is dithered. In one example, the PLL includes a novel programmable clock dithering circuit. The programmable clock dithering circuit is controllable via a serial bus to dither the phase of the clock signal in a selected one of several ways. If the clock signal is dithered in a first way (pseudo-random phase dithering), then the power of digital noise generated by the delta-sigma modulator is spread over a frequency band, thereby reducing the degree to which the noise interferes with other circuitry. If the clock signal is dithered in a second way (rotational phase dithering), then the power of digital noise is frequency shifted such that the degree to which the noise interferes with the other circuitry is reduced. The programmable clock dithering circuit can be controlled in other ways. For example, dithering can be programmably disabled.
    • 在分数N锁相环中提供给Δ-Σ调制器的时钟信号被抖动。 在一个示例中,PLL包括新颖的可编程时钟抖动电路。 可编程时钟抖动电路可通过串行总线进行控制,以选择的几种方式对时钟信号的相位进行抖动。 如果时钟信号以第一种方式抖动(伪随机相位抖动),则由Δ-Σ调制器产生的数字噪声的功率在频带上扩展,从而降低噪声干扰其他电路的程度 。 如果时钟信号以第二种方式抖动(旋转相位抖动),则数字噪声的功率被频移,使得噪声干扰另一电路的程度降低。 可编程时钟抖动电路可以以其他方式进行控制。 例如,抖动可以可编程地禁用。