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    • 4. 发明公开
    • 주파수합성기 및 주파수조절방법
    • 频率合成器和频率校准方法
    • KR1020080035786A
    • 2008-04-24
    • KR1020060102283
    • 2006-10-20
    • (주)에프씨아이
    • 이정철안문경
    • H03L7/16H03L7/18
    • H03L7/087H03L7/193H03L7/1976
    • A frequency synthesizer and a frequency calibration method are provided to perform frequency calibration in a coarse mode rapidly by simply using a reference signal and an output of a pre-scaler, thereby reducing power consumption and phase noise. A frequency synthesizer includes a reference divider(210), a phase detector(220), a main divider(270), a charge pump(230), a loop filter(240), a first switch(S1), a second switch(S2), a voltage controlled oscillator(250), and an automatic frequency calibration block(260). The reference divider divides a frequency of a reference signal into 1/(R1). The R1 is an integer. The phase detector outputs a pulse corresponding to a phase difference between the output signal of the reference divider and a fine mode signal. The charge pump generates pumping voltage(Vcp) corresponding to charges which are charged or discharged according to width and sign of the pulse. The loop filter removes noises generated in a frequency calibration loop operation, and determines a voltage level of the pumping voltage. The first switch transmits the pumping voltage to the voltage controlled oscillator in response to a first switch control signal. The second switch transmits the reference voltage to the voltage controlled oscillator in response to a second switch control signal. The voltage controlled oscillator generates an output signal corresponding to the calibration voltage applied through a frequency control signal, the first switch, and the second switch. The automatic frequency calibration block generates the frequency control signal, and the first and second switch control signal in response to the pumping voltage, the reference signal, and the coarse mode signal.
    • 提供频率合成器和频率校准方法,通过简单地使用预分频器的参考信号和输出,以粗略模式进行频率校准,从而降低功耗和相位噪声。 频率合成器包括参考分压器(210),相位检测器(220),主分压器(270),电荷泵(230),环路滤波器(240),第一开关(S1),第二开关 S2),压控振荡器(250)和自动频率校准块(260)。 参考分频器将参考信号的频率分为1 /(R1)。 R1是整数。 相位检测器输出与参考分压器的输出信号和精细模式信号之间的相位差对应的脉冲。 电荷泵产生对应于根据脉冲宽度和符号充电或放电的电荷的泵浦电压(Vcp)。 环路滤波器消除在频率校准环路操作中产生的噪声,并确定泵浦电压的电压电平。 第一开关响应于第一开关控制信号将泵浦电压传送到压控振荡器。 第二开关响应于第二开关控制信号将参考电压发送到压控振荡器。 压控振荡器产生对应于通过频率控制信号施加的校准电压的输出信号,第一开关和第二开关。 自动频率校准块产生频率控制信号,并且响应于泵浦电压,参考信号和粗略模式信号产生第一和第二开关控制信号。
    • 7. 发明公开
    • 주파수 합성기의 적응 주파수 조정장치
    • 频率合成器的自适应频率校准装置
    • KR1020070009749A
    • 2007-01-19
    • KR1020050063594
    • 2005-07-14
    • (주)에프씨아이
    • 이정철
    • H03L7/00H03L7/08
    • H03L7/1976H03L7/0891H03L7/113
    • An adaptive frequency calibration apparatus of a frequency synthesizer is provided to have a small silicon region and to reduce power consumption by designing and using an output of a free scaler and an input of a TCXO(Temperature Compensated Crystal Oscillator). An adaptive frequency calibration apparatus of a frequency synthesizer includes a reference demultiplier(R2), a feedback demultiplier(N2), a frequency comparator(263), and a state machine(265). The reference demultiplier(R2) demultiplies an output frequency of a TCXO. The feedback demultiplier(N2) receives and demultiplies the output frequency of the free scaler. The frequency comparator(263) compares frequencies based on the output of the reference demultiplier(N2) and the output of the feedback demultiplier(N2). The state machine(265) provides a predetermined bit having a predetermined frequency resolution to a VCO(Voltage Controlled Oscillator) bank to control a frequency of the VCO bank by the frequency comparison result.
    • 频率合成器的自适应频率校准装置被提供以具有小的硅区域并且通过设计和使用自由缩放器的输出和TCXO(温度补偿晶体振荡器)的输入来降低功耗。 频率合成器的自适应频率校准装置包括基准分压器(R2),反馈分频器(N2),频率比较器(263)和状态机(265)。 参考分频器(R2)将TCXO的输出频率分频。 反馈分频器(N2)接收和去除自由定标器的输出频率。 频率比较器(263)基于参考分压器(N2)的输出和反馈分压器(N2)的输出来比较频率。 状态机(265)向VCO(压控振荡器)组提供具有预定频率分辨率的预定位,以通过频率比较结果控制VCO组的频率。
    • 10. 发明公开
    • 쉐어링 트랜지스터의 턴 온 시간 제어가 가능한 전하펌프
    • 用于控制的充电泵在共享晶体管的时间
    • KR1020090096032A
    • 2009-09-10
    • KR1020080021357
    • 2008-03-07
    • (주)에프씨아이
    • 이정철황명운
    • G11C5/14G11C8/00
    • G11C5/145
    • A charge pump for controlling a turn-on time of a sharing transistor is provided to prevent a reverse current generated after a source switch is turned off by delivering a sharing transistor to a fixed voltage level. A current sourcing part(100) includes a source switch, supplies a current to a loop filter, and accumulates an electric charge. A source control signal is applied to a gate, is controlled in a timing controller, and is generated in a phase detector. A current sink part(200) includes a sink switch, receives a current in the loop filter, and pulls an electric charge. A sink control signal is applied to the gate, is controlled in the timing controller, and is generated in the phase detector. A sharing part(400) comprises a sharing transistor connected to the sink switch and the source switch. The timing controller(500) generates a control signal which differently controls operation timing of the sink switch and the source switch, and operation timing of the sharing transistor.
    • 提供一种用于控制共享晶体管的接通时间的电荷泵,以防止在通过将共享晶体管传递到固定电压电平来关闭源极开关之后产生的反向电流。 电流源部分(100)包括源开关,将电流提供给环路滤波器,并累积电荷。 源控制信号施加到门,被控制在定时控制器中,并在相位检测器中产生。 电流吸收部分(200)包括吸收开关,接收环路滤波器中的电流,并且拉动电荷。 宿控制信号施加到门,在定时控制器中被控制,并在相位检测器中产生。 共享部分(400)包括连接到宿开关和源开关的共享晶体管。 定时控制器(500)产生不同地控制吸收开关和源极开关的操作定时以及共享晶体管的操作定时的控制信号。