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    Apparatus and method for generating quadrupled reference clock from single ended crystal oscillator
    1.
    发明授权
    Apparatus and method for generating quadrupled reference clock from single ended crystal oscillator 有权
    从单端晶体振荡器产生四倍参考时钟的装置和方法

    公开(公告)号：US09490784B2

    公开(公告)日：2016-11-08

    申请号：US14640672

    申请日：2015-03-06

    Applicant: QUALCOMM Incorporated

    Inventor： Mohammad Bagher Vahid Far ,  Alireza Khalili ,  Yashar Rajavi ,  Amirpouya Kavousian

    IPC: H03B19/14 ,  H03K5/156 ,  H03K5/00 ,  H03B19/10

    CPC classification number: H03K5/00006 ,  H03B19/10 ,  H03B19/14 ,  H03K5/1565

    Abstract: A method, an apparatus, and a computer program product are provided. The apparatus outputs a sinusoidal signal according to a first clock frequency, generates, a first digital signal having a 25% duty cycle based on the sinusoidal signal, generates a second digital signal having a 25% duty cycle based on the sinusoidal signal, combines the first digital signal and the second digital signal to generate a combined digital signal having a 50% duty cycle and a second clock frequency that is double the first clock frequency, and doubles the second clock frequency of the combined digital signal to generate an output signal having a third clock frequency that is quadruple the first clock frequency. The apparatus further generates a first control voltage and a second control voltage for the first buffer and a third control voltage for the second buffer based on the output signal.

    Abstract translation: 提供了一种方法，装置和计算机程序产品。 该装置根据第一时钟频率输出正弦信号，产生基于正弦信号的具有25％占空比的第一数字信号，产生基于正弦信号具有25％占空比的第二数字信号， 第一数字信号和第二数字信号，以产生具有50％占空比和第二时钟频率的组合数字信号，该第二时钟频率是第一时钟频率的两倍，并且使组合数字信号的第二时钟频率加倍，以产生具有 第三个时钟频率是第一个时钟频率的四倍。 该装置还基于输出信号产生用于第一缓冲器的第一控制电压和第二控制电压以及第二缓冲器的第三控制电压。

    Differential crystal oscillator circuit
    3.
    发明授权
    Differential crystal oscillator circuit 有权
    差分晶振电路

    公开(公告)号：US09300249B2

    公开(公告)日：2016-03-29

    申请号：US14338241

    申请日：2014-07-22

    Applicant: QUALCOMM Incorporated

    Inventor： Yashar Rajavi ,  Amirpouya Kavousian ,  Alireza Khalili ,  Mohammad Bagher Vahid Far ,  Abbas Komijani

    IPC: H03B5/32 ,  H03B5/36

    CPC classification number: H03B5/364 ,  H03B5/06 ,  H03B5/36 ,  H03B2200/004 ,  H03B2200/0094

    Abstract: A differential crystal oscillator circuit, including: first and second output terminals; a cross-coupled oscillation unit including first and second transistors cross-coupled to the first and second output terminals; first and second metal-oxide semiconductor field-effect transistor (MOSFET) diodes, each MOSFET diode including a resistor connected between gate and drain terminals, wherein the first MOSFET diode couples to the first transistor to provide low-impedance load at low frequencies and high-impedance load at higher frequencies to the first transistor, wherein the second MOSFET diode couples to the second transistor to provide low-impedance load at low frequencies and high-impedance load at higher frequencies to the second transistor; and a reference resonator coupled between the first and second output terminals to establish an oscillation frequency.

    Abstract translation: 一种差分晶体振荡器电路，包括：第一和第二输出端子; 交叉耦合振荡单元，包括交叉耦合到第一和第二输出端的第一和第二晶体管; 第一和第二金属氧化物半导体场效应晶体管（MOSFET）二极管，每个MOSFET二极管包括连接在栅极和漏极端子之间的电阻器，其中第一MOSFET二极管耦合到第一晶体管以在低频和高电平下提供低阻抗负载 在第一晶体管的较高频率处的阻抗负载，其中所述第二MOSFET二极管耦合到所述第二晶体管，以在低频处提供低阻抗负载，并以较高频率向所述第二晶体管提供高阻抗负载; 以及耦合在第一和第二输出端子之间以建立振荡频率的参考谐振器。

    Overlapping uncoupled inductors for low-cost multi-frequency voltage-controlled oscillators
    6.
    发明授权
    Overlapping uncoupled inductors for low-cost multi-frequency voltage-controlled oscillators 有权
    用于低成本多频电压控制振荡器的重叠非耦合电感器

    公开(公告)号：US09543892B1

    公开(公告)日：2017-01-10

    申请号：US14801535

    申请日：2015-07-16

    Applicant: QUALCOMM Incorporated

    Inventor： Mohammad Farazian ,  Amirpouya Kavousian ,  Alireza Khalili

    IPC: H03B5/08 ,  H03B5/12

    CPC classification number: H03B5/1256 ,  H03B5/08 ,  H03B5/12 ,  H03B5/1206

    Abstract: Certain aspects of the present disclosure provide techniques and apparatus for generating multiple oscillating signals. One example circuit generally includes a first voltage-controlled oscillator (VCO) having a first inductor and a second VCO having a second inductor in parallel with a third inductor, wherein the second and third inductors are disposed inside a loop of the first inductor and may behave as a magnetic dipole. The loop of the first inductor may be symmetrical, and a combined geometry of loops of the second and third inductors may be symmetrical. The coupling coefficient (k) between the first inductor and a combination of the second and third inductors may be small (e.g., k

    Abstract translation: 本公开的某些方面提供了用于产生多个振荡信号的技术和装置。 一个示例电路通常包括具有第一电感器的第一压控振荡器（VCO）和具有与第三电感器并联的第二电感器的第二VCO，其中第二和第三电感器设置在第一电感器的环路内，并且可以 表现为磁偶极子。 第一电感器的环路可以是对称的，并且第二和第三电感器的环路的组合几何形状可以是对称的。 由于电路布局的对称几何形状，第一电感器和第二和第三电感器的组合之间的耦合系数（k）可能很小（例如，k <0.01）。 利用较小的k，第一和第二VCO的电感器可以彼此更靠近地放置，从而减少两个VCO消耗的面积。

    Differential Crystal Oscillator Circuit
    9.
    发明申请
    Differential Crystal Oscillator Circuit 有权
    差分晶振电路

    公开(公告)号：US20160028349A1

    公开(公告)日：2016-01-28

    申请号：US14338241

    申请日：2014-07-22

    Applicant: QUALCOMM Incorporated

    Inventor： Yashar Rajavi ,  Amirpouya Kavousian ,  Alireza Khalili ,  Mohammad Bagher Vahid Far ,  Abbas Komijani

    IPC: H03B5/36

    CPC classification number: H03B5/364 ,  H03B5/06 ,  H03B5/36 ,  H03B2200/004 ,  H03B2200/0094

    Abstract: A differential crystal oscillator circuit, including: first and second output terminals; a cross-coupled oscillation unit including first and second transistors cross-coupled to the first and second output terminals; first and second metal-oxide semiconductor field-effect transistor (MOSFET) diodes, each MOSFET diode including a resistor connected between gate and drain terminals, wherein the first MOSFET diode couples to the first transistor to provide low-impedance load at low frequencies and high-impedance load at higher frequencies to the first transistor, wherein the second MOSFET diode couples to the second transistor to provide low-impedance load at low frequencies and high-impedance load at higher frequencies to the second transistor; and a reference resonator coupled between the first and second output terminals to establish an oscillation frequency.

    Abstract translation: 一种差分晶体振荡器电路，包括：第一和第二输出端子; 交叉耦合振荡单元，包括交叉耦合到第一和第二输出端的第一和第二晶体管; 第一和第二金属氧化物半导体场效应晶体管（MOSFET）二极管，每个MOSFET二极管包括连接在栅极和漏极端子之间的电阻器，其中第一MOSFET二极管耦合到第一晶体管以在低频和高电平下提供低阻抗负载 在第一晶体管的较高频率处的阻抗负载，其中所述第二MOSFET二极管耦合到所述第二晶体管，以在低频处提供低阻抗负载，并以较高频率向所述第二晶体管提供高阻抗负载; 以及耦合在第一和第二输出端子之间以建立振荡频率的参考谐振器。

    Method to pre-charge crystal oscillators for fast start-up
    10.
    发明授权
    Method to pre-charge crystal oscillators for fast start-up 有权
    晶体振荡器预充电快速启动的方法

    公开(公告)号：US09246435B1

    公开(公告)日：2016-01-26

    申请号：US14617716

    申请日：2015-02-09

    Applicant: QUALCOMM Incorporated

    Inventor： Amirpouya Kavousian ,  Yashar Rajavi ,  Alireza Khalili ,  Mohammad Bagher Vahid Far ,  Abbas Komijani

    IPC: H03B5/06 ,  H03B5/36 ,  H03K3/03

    CPC classification number: H03B5/06 ,  H03B5/362 ,  H03B5/364 ,  H03B5/366 ,  H03B2200/0094 ,  H03K3/014 ,  H03K3/0307 ,  H03K3/0315 ,  H03L3/00 ,  H03L7/00

    Abstract: A method and apparatus for charging a crystal oscillator are provided. A voltage generating module outputs a ramp voltage signal to a ring oscillator. The ring oscillator generates and outputs a waveform based on the ramp voltage signal. The ramp voltage signal facilitates the ring oscillator to output the waveform at a frequency that varies with time, wherein the varying frequency is within a frequency range of the crystal oscillator. An inverter generates a digital input signal based on the waveform. The digital input signal is sent to an input of the crystal oscillator for charging the crystal oscillator. A feedback module outputs a feedback signal based on the digital input signal, wherein the feedback signal controls the voltage generating module to generate a fixed voltage signal that facilitates the ring oscillator to output the waveform at a frequency that is equal to a resonance frequency of the crystal oscillator.

    Abstract translation: 提供了一种用于对晶体振荡器充电的方法和装置。 电压产生模块向环形振荡器输出斜坡电压信号。 环形振荡器产生并输出基于斜坡电压信号的波形。 斜坡电压信号有助于环形振荡器以随时间变化的频率输出波形，其中变化的频率在晶体振荡器的频率范围内。 逆变器根据波形产生数字输入信号。 数字输入信号被发送到晶体振荡器的输入端，用于对晶体振荡器充电。 反馈模块基于数字输入信号输出反馈信号，其中反馈信号控制电压产生模块以产生固定电压信号，其有助于环形振荡器以等于的频率的频率输出波形 晶体振荡器。

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