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    • 41. 发明专利
    • Pll circuit, radio terminal device, and control method of pll circuit
    • PLL电路,无线电终端设备和PLL电路的控制方法
    • JP2010034618A
    • 2010-02-12
    • JP2008191491
    • 2008-07-24
    • Sony Corpソニー株式会社
    • TSUDA SHINICHIRO
    • H03L7/093H03L7/06
    • H03L7/08H03L7/085
    • PROBLEM TO BE SOLVED: To provide a PLL circuit having an oscillator to be digitally controlled, and capable of compensating offset caused in switching loop gain and being locked at a high speed. SOLUTION: The PLL circuit includes: a phase comparison unit for comparing an accumulated addition value of a division ratio converted into a digital value with an accumulated addition value of an oscillating signal from an oscillator controlled by using the digital value in each cycle of a reference frequency; a data conversion unit having a variable gain amplification unit to change a gain and causing output of the phase comparison unit to converge to an arbitrary setting value; an offset detection unit for detecting an offset arising due to a change in gain of the variable gain amplification unit using output of the phase comparison unit; and an offset compensation unit for compensating for the offset detected by the offset detection unit in timing when the gain of the variable gain amplification unit changes. COPYRIGHT: (C)2010,JPO&INPIT
    • 要解决的问题:提供具有数字控制的振荡器的PLL电路,并且能够补偿在开关环路增益中引起的偏移并以高速锁定。 解决方案:PLL电路包括:相位比较单元,用于将转换成数字值的分频比的累积加法值与来自在每个周期中使用数字值控制的振荡器的振荡信号的累积加法值进行比较 的参考频率; 数据转换单元,具有可变增益放大单元,用于改变增益并使相位比较单元的输出收敛到任意设定值; 偏移检测单元,用于使用相位比较单元的输出来检测由于可变增益放大单元的增益变化而产生的偏移; 以及偏移补偿单元,用于在可变增益放大单元的增益改变的定时补偿由偏移检测单元检测到的偏移。 版权所有(C)2010,JPO&INPIT
    • 46. 发明专利
    • Pll oscillation circuit
    • PLL振荡电路
    • JP2007336434A
    • 2007-12-27
    • JP2006168626
    • 2006-06-19
    • Nippon Dempa Kogyo Co Ltd日本電波工業株式会社
    • KIMURA HIROKIFURUHATA TSUKASAKITAYAMA YASUOONISHI NAOKI
    • H03L7/08
    • H03L7/18H03L7/085
    • PROBLEM TO BE SOLVED: To provide a PLL oscillation circuit capable of preventing deterioration in a phase noise characteristic and a spurious characteristic of a VCO output. SOLUTION: The PLL oscillation circuit of digital control includes a VCO 1, frequency divider 2, a reference oscillation circuit 3, an A/D converter 4, a phase comparator 5, a digital filter 6, a D/A converter 7. An analog filter 8, a reference signal supplied from the reference oscillation circuit 3 passes through a narrow band crystal filter (MCF) 11, from which the signal is outputted to the A/D converter 4 so as to eliminate noise, jitter and spurious waves included in the reference signal, resulting in that the PLL oscillation circuit can prevent the deterioration in the phase noise characteristic and the spurious characteristic of the VCO output. COPYRIGHT: (C)2008,JPO&INPIT
    • 要解决的问题:提供一种能够防止VCO输出的相位噪声特性和寄生特性劣化的PLL振荡电路。 解决方案:数字控制的PLL振荡电路包括VCO 1,分频器2,参考振荡电路3,A / D转换器4,相位比较器5,数字滤波器6,D / A转换器7 模拟滤波器8,从参考振荡电路3提供的参考信号通过窄带晶体滤波器(MCF)11,从该信号输出到A / D转换器4,以消除噪声,抖动和杂散 波形包括在参考信号中,导致PLL振荡电路可以防止VCO输出的相位噪声特性和寄生特性的劣化。 版权所有(C)2008,JPO&INPIT