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    • 7. 发明申请
    • PHASE LOCKED LOOP WITH PHASE CORRECTION IN THE FEEDBACK LOOP
    • 在反馈环中进行相位校正的相位锁定环
    • WO2013022679A1
    • 2013-02-14
    • PCT/US2012/049226
    • 2012-08-01
    • QUALCOMM INCORPORATEDZHANG, Gang
    • ZHANG, Gang
    • H03L7/081H03L7/197
    • H03L7/1976
    • A frequency synthesizer circuit is disclosed. The frequency synthesizer circuit includes a comparator circuit coupled to a reference clock and a phase-corrected output signal. The frequency synthesizer circuit also includes a loop filter coupled to the comparator circuit. The frequency synthesizer circuit also includes an oscillator coupled to the loop filter. The frequency synthesizer circuit also includes a fractional divider coupled to an output of the oscillator. The frequency synthesizer circuit also includes phase correction circuitry that corrects a phase of an output of the fractional divider to produce the phase-corrected output signal.
    • 公开了一种频率合成器电路。 频率合成器电路包括耦合到参考时钟和相位校正的输出信号的比较器电路。 频率合成器电路还包括耦合到比较器电路的环路滤波器。 频率合成器电路还包括耦合到环路滤波器的振荡器。 频率合成器电路还包括耦合到振荡器的输出的分数分频器。 频率合成器电路还包括相位校正电路,其校正分数分频器的输出的相位以产生相位校正的输出信号。
    • 9. 发明申请
    • ADC-BASED MIXED-MODE DIGITAL PHASE-LOCKED LOOP
    • 基于ADC的混合模式数字锁相环
    • WO2011002944A1
    • 2011-01-06
    • PCT/US2010/040684
    • 2010-06-30
    • QUALCOMM INCORPORATEDZHANG, Gang
    • ZHANG, Gang
    • H03L7/085H03L7/089
    • H03L7/0891H03L7/085H03L7/0895H03L7/10H03L7/1976
    • A Phase-Locked Loop (PLL) includes a Phase-to-Digital Converter (PDC), a programmable digital loop filter, a Digitally-Controlled Oscillator (DCO), and a loop divider. Within the PDC, phase information is converted into a stream of digital values by a charge pump and an Analog-to-Digital Converter (ADC). The stream of digital values is supplied to the digital loop filter which in turn supplies digital tuning words to the DCO. A number of types of ADCs can be used for the ADC including a continuous-time delta-sigma oversampling Digital ADC and a Successive Approximation ADC. The voltage signal on the charge pump output is a small amplitude midrange voltage signal. The small voltage amplitude of the signal leads to numerous advantages including improved charge pump linearity, reduced charge pump noise, and lower supply voltage operation of the overall PLL.
    • 锁相环(PLL)包括一个相位数转换器(PDC),一个可编程数字环路滤波器,一个数字控制振荡器(DCO)和一个环路分频器。 在PDC中,相位信息由电荷泵和模数转换器(ADC)转换成数字值流。 数字值流被提供给数字环路滤波器,数字环路滤波器又向DCO提供数字调谐字。 ADC可以使用多种类型的ADC,包括连续时间Δ-sigma过采样数字ADC和逐次逼近ADC。 电荷泵输出上的电压信号是一个小幅度的中频电压信号。 信号的小电压幅度导致许多优点,包括改进的电荷泵线性度,降低的电荷泵噪声以及整个PLL的较低电源电压操作。
    • 10. 发明申请
    • LINEAR PHASE FREQUENCY DETECTOR AND CHARGE PUMP FOR PHASE-LOCKED LOOP
    • 线性相位频率检测器和充电泵用于锁相环
    • WO2008067324A1
    • 2008-06-05
    • PCT/US2007/085658
    • 2007-11-27
    • QUALCOMM INCORPORATEDZHANG, Gang
    • ZHANG, Gang
    • H03L7/00
    • H03L7/1976H03L7/0891
    • Techniques for achieving linear operation for a phase frequency detector and a charge pump in a phase-locked loop (PLL) are described. The phase frequency detector receives a reference signal and a clock signal, generates first and second signals based on the reference and clock signals, and resets the first and second signals based on only the first signal. The first and second signals may be up and down signals, respectively, or may be down and up signals, respectively. The phase frequency detector may delay the first signal by a predetermined amount, generate a reset signal based on the delayed first signal and the second signal, and reset the first and second signals with the reset signal. The charge pump receives the first and second signals and generates an output signal indicative of phase error between the reference and clock signals.
    • 描述了在锁相环(PLL)中实现相位频率检测器和电荷泵的线性操作的技术。 相位频率检测器接收参考信号和时钟信号,基于参考和时钟信号产生第一和第二信号,并且仅基于第一信号复位第一和第二信号。 第一和第二信号可以分别是上下信号,也可以分别是下降信号。 相位频率检测器可以将第一信号延迟预定量,基于延迟的第一信号和第二信号产生复位信号,并用复位信号复位第一和第二信号。 电荷泵接收第一和第二信号,并产生指示参考和时钟信号之间的相位误差的输出信号。