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    Voltage controlled oscillator
    1.
    发明授权
    Voltage controlled oscillator 有权

    公开(公告)号：US11245358B1

    公开(公告)日：2022-02-08

    申请号：US17105454

    申请日：2020-11-25

    Applicant: NOVATEK Microelectronics Corp.

    Inventor： Cheng-Dao Su ,  Tzu-Cheng Yang ,  Chih-Hung Chen

    IPC: H03L1/00 ,  G05F3/26 ,  H03B5/04 ,  H03K3/011 ,  H03K3/013 ,  H03B5/12

    Abstract: A voltage controlled oscillator is provided. The voltage controlled oscillator includes a current controlled oscillator, a voltage to current conversion circuit and a noise cancellation circuit. The current controlled oscillator is configured to receive a bias current and generate an oscillating signal with an oscillating frequency according to the bias current. The voltage to current conversion circuit is coupled to a power supply voltage and configured to generate a supply current according to an input voltage. The noise cancellation circuit is configured to receive a bias voltage and the supply current from the voltage to current conversion circuit, and configured to generate a noise cancellation current in response to power supply voltage variation and cancel the noise cancellation current from the supply current to generate the bias current. The bias voltage of the noise cancellation circuit is coupled to an internal voltage of the voltage to current conversion circuit.

    Oscillator, a clock generator and a method for generating a clock signal
    2.
    发明授权
    Oscillator, a clock generator and a method for generating a clock signal 有权

    公开(公告)号：US10355697B2

    公开(公告)日：2019-07-16

    申请号：US15725299

    申请日：2017-10-05

    Applicant: Novatek Microelectronics Corp.

    Inventor： Chih-Hsiang Chang ,  Chih-Hung Chen

    IPC: H03B5/04 ,  H03B5/12 ,  H03L1/02 ,  H03L1/00

    Abstract: An oscillator configured to generate an oscillation signal is provided. The oscillator includes a transistor pair and a cross-coupled transistor pair. The transistor pair is coupled to a first current source and has a first transconductance. The first transconductance is changed in response to a current value of the first current source. The cross-coupled transistor pair is coupled to a second current source and has a second transconductance. The second transconductance is changed in response to a current value of second current source. The transistor pair and the cross-coupled transistor pair are mutually coupled by a plurality of inductors. A frequency of the oscillation signal is determined according to the first transconductance and the second transconductance. Furthermore, a clock generator and a method for generating a clock signal thereof are also provided.

    OSCILLATOR, A CLOCK GENERATOR AND A METHOD FOR GENERATING A CLOCK SIGNAL
    5.
    发明申请
    OSCILLATOR, A CLOCK GENERATOR AND A METHOD FOR GENERATING A CLOCK SIGNAL 有权
    振荡器，时钟发生器和用于产生时钟信号的方法

    公开(公告)号：US20160126959A1

    公开(公告)日：2016-05-05

    申请号：US14829657

    申请日：2015-08-19

    Applicant: Novatek Microelectronics Corp.

    Inventor： Chih-Hsiang Chang ,  Chih-Hung Chen

    IPC: H03L1/02 ,  H03K3/354

    CPC classification number: H03L1/022 ,  H03B5/04 ,  H03B5/1215 ,  H03B5/1225 ,  H03B5/1228 ,  H03B5/1237 ,  H03B5/1271 ,  H03B5/1296 ,  H03B2200/0038 ,  H03L1/00

    Abstract: An oscillator configured to generate an oscillation signal is provided. The oscillator includes a transistor pair and a cross-coupled transistor pair. The transistor pair is coupled to a first current source and has a first transconductance. The first transconductance is changed in response to a current value of the first current source. The cross-coupled transistor pair is coupled to a second current source and has a second transconductance. The second transconductance is changed in response to a current value of second current source. The transistor pair and the cross-coupled transistor pair are mutually coupled by a plurality of inductors. A frequency of the oscillation signal is determined according to the first transconductance and the second transconductance. Furthermore, a clock generator and a method for generating a clock signal thereof are also provided.

    Abstract translation: 提供了一种配置成产生振荡信号的振荡器。 振荡器包括晶体管对和交叉耦合晶体管对。 晶体管对耦合到第一电流源并且具有第一跨导。 第一跨导响应于第一电流源的当前值而改变。 交叉耦合晶体管对耦合到第二电流源并具有第二跨导。 第二跨导响应于第二电流源的当前值而改变。 晶体管对和交叉耦合晶体管对由多个电感器相互耦合。 根据第一跨导和第二跨导来确定振荡信号的频率。 此外，还提供了时钟发生器和用于产生其时钟信号的方法。

    Inductor-less local oscillator generation apparatus
    6.
    发明授权
    Inductor-less local oscillator generation apparatus 有权

    公开(公告)号：US10027280B1

    公开(公告)日：2018-07-17

    申请号：US15653519

    申请日：2017-07-18

    Applicant: Novatek Microelectronics Corp.

    Inventor： Cheng-Dao Su ,  Chih-Hung Chen ,  Tzu-Cheng Yang ,  Yi-Ming Wu

    IPC: H03K5/14 ,  H03B5/12 ,  H03K23/40 ,  H03K21/10 ,  H04B17/10

    Abstract: An inductor-less local oscillator (LO) signal generation apparatus configured to generate one or more output signals which reduce a frequency pulling effect. The LO signal generation apparatus includes a multi-phase signal generation circuit, a phase signal generation circuit and one or more output circuits. The multi-phase signal generation circuit receives an input clock signal having a first frequency to generate a multi-phase clock signal. The multi-phase clock signal includes a plurality of clock signals each having the first frequency and different phases. The phase signal generation circuit is coupled to the multi-phase signal generation circuit to receive the multi-phase clock signal and output a plurality of phase signals indicating the phases of the clock signals. The one or more output circuits output the one or more output signals according to the clock signals and the phase signals without receiving feedback of any of the one or more output signals.

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