公开(公告)号：US6141313A

公开(公告)日：2000-10-31

申请号：US113576

申请日：1998-07-10

申请人： Luca Celant ,  Marco De Micheli ,  Melchiorre Bruccoleri ,  Luca Rigazio

发明人： Luca Celant ,  Marco De Micheli ,  Melchiorre Bruccoleri ,  Luca Rigazio

IPC分类号： G11B20/14 ,  H03B29/00 ,  H03L7/07 ,  H03L7/22 ,  G11B7/00

CPC分类号： H03L7/07 ,  G11B20/1403

摘要： An integrated circuit including two phase-locked loops each with its own oscillator. To prevent locking owing to injection between the two oscillators due to stray currents in the integrated circuit, a noise generator is coupled to the oscillator of one of the loops and a timer is provided for activating the noise generator in a manner such that the noise generated changes the frequency of the oscillator randomly when the other loop is in operation.

摘要翻译： 一个集成电路，包括两个锁相环，每个具有自己的振荡器。 为了防止由于集成电路中的杂散电流引起的两个振荡器之间的注入而导致的锁定，噪声发生器耦合到一个环路的振荡器，并且提供了定时器，以使得产生噪声的方式激活噪声发生器 当另一个循环运行时，随机振荡振荡器的频率。

公开(公告)号：US06414810B1

公开(公告)日：2002-07-02

申请号：US09301192

申请日：1999-04-28

申请人： Giacomino Bollati ,  Melchiorre Bruccoleri ,  Salvatore Portaluri ,  Luca Celant

发明人： Giacomino Bollati ,  Melchiorre Bruccoleri ,  Salvatore Portaluri ,  Luca Celant

IPC分类号： G11B5035

CPC分类号： G11B20/10046 ,  G11B2220/2516

摘要： A method of equalizing a read channel of a mass magnetic memory device comprises attenuating the low frequencies of the spectrum of the analog signal originating from an electromagnetic read transducer without boosting the high frequency harmonic components of the spectrum. The low frequencies of the spectrum of the analog input signal are attenuated with a low pass filter of an order in a range from 6 to 8 and a boost is implemented by introducing two real and opposed zeroes in the transfer function of the filter without altering the group delay.

摘要翻译： 均衡质量磁存储器件的读通道的方法包括衰减源自电磁读取换能器的模拟信号的频谱的低频，而不会增加频谱的高频谐波分量。 模拟输入信号的频谱的低频通过6至8范围内的阶数的低通滤波器衰减，并且通过在滤波器的传递函数中引入两个实数和相对的零来实现升压，而不改变 群延迟

公开(公告)号：US06437606B1

公开(公告)日：2002-08-20

申请号：US09687145

申请日：2000-10-13

申请人： Danilo Ranieri ,  Davide Brambilla ,  Edoardo Botti ,  Luca Celant

发明人： Danilo Ranieri ,  Davide Brambilla ,  Edoardo Botti ,  Luca Celant

IPC分类号： H03K522

CPC分类号： H03F1/52

摘要： A method of assessing the offset on the output nodes of an amplifying channel includes generating a logic signal for signaling the existence of an offset having a level exceeding a window of permitted levels symmetric about the zero level. The window is defined by a negative limit value and by a positive limit value. The method includes establishing an interval or phase of detection by applying to an input of a detection circuit a timing pulse with a certain frequency, sensing the rising edge of the timing pulse and setting a bistable circuit, and comparing the signal on the output nodes of the amplifiers channel with the window of permitted values. The bistable circuit is reset upon the occurrence, after the initial setting, of an output signal amplitude within the window of permitted values. Failure of the bistable circuit to reset before the end of the detection phase signals an excessive offset.

摘要翻译： 评估放大信道的输出节点上的偏移量的方法包括：生成逻辑信号，用于发信号通知具有超过关于零电平对称的允许电平的窗口的电平的偏移的存在。 窗口由负极限值和正极限值定义。 该方法包括通过向检测电路的输入施加具有一定频率的定时脉冲，感测定时脉冲的上升沿并设置双稳态电路，建立检测的间隔或相位，并将输出节点上的信号进行比较 放大器通道与允许值的窗口。 在初始设置之后，双稳态电路在允许值的窗口内的输出信号幅度出现之后被复位。 双稳态电路在检测阶段结束之前复位的故障发出过大的偏移。

公开(公告)号：US06466097B1

公开(公告)日：2002-10-15

申请号：US09421643

申请日：1999-10-20

申请人： Luca Celant ,  Marco Demicheli ,  Melchiorre Bruccoleri ,  Daniele Ottini

发明人： Luca Celant ,  Marco Demicheli ,  Melchiorre Bruccoleri ,  Daniele Ottini

IPC分类号： H03L706

CPC分类号： H03L7/0893 ,  H03L7/0896

摘要： A phase locked loop is provided that includes a phase comparator, a charge pump circuit, a loop filter, and a voltage controlled oscillator. The charge pump circuit includes two symmetric branches, feedback paths, and circuit breaking switches. Each of the symmetric branches has a constant current generator and a pulsed current generator, with one terminal of the loop filter being connected to one of the symmetric branches and the other terminal of the loop filter being connected to the other of the symmetric branches. The feedback paths control the constant current generators based on voltages at the terminals of the loop filter, and each of the circuit breaking switches couple one of the pulsed current generators and the corresponding terminal of the loop filter. The pulsed current generators supply a first current whose amplitude is proportional to an amplitude of a second current supplied by the constant current generators through the duty cycle of the first current. In a preferred embodiment, the circuit breaking switches are controlled by phase error signals from the phase comparator. A method for controlling a charge pump circuit in a phase locked loop is also provided.

摘要翻译： 提供了一个锁相环，其包括相位比较器，电荷泵电路，环路滤波器和压控振荡器。 电荷泵电路包括两个对称分支，反馈路径和断路开关。 每个对称分支具有恒定电流发生器和脉冲电流发生器，环路滤波器的一个端子连接到一个对称分支，并且环路滤波器的另一个端子连接到另一个对称分支。 反馈路径基于环路滤波器的端子处的电压来控制恒定电流发生器，并且每个断路开关耦合脉冲电流发生器中的一个和环路滤波器的相应端子。 脉冲电流发生器通过第一电流的占空比来提供其振幅与由恒定电流发生器提供的第二电流的振幅成比例的第一电流。 在优选实施例中，断路开关由来自相位比较器的相位误差信号控制。 还提供了一种用于控制锁相环中的电荷泵电路的方法。