公开(公告)号：US07671667B2

公开(公告)日：2010-03-02

申请号：US11967480

申请日：2007-12-31

申请人： Jeremy Kuehlwein ,  Marius Dina

发明人： Jeremy Kuehlwein ,  Marius Dina

IPC分类号： G05F1/10

CPC分类号： H03K17/122

摘要： One embodiment of the invention includes a current mirror system. The system comprises a master circuit configured to conduct a first current in response to an activation state of an activation signal. The system also comprises a slave circuit configured to generate at least one second additional current in response to the activation state of the activation signal. Each of the at least one additional current can be proportional to the first current. The system further comprises a current path circuit that is configured as a substantial copy of the master circuit, the current path circuit being configured to conduct the first current in response to a deactivation state of the activation signal.

摘要翻译： 本发明的一个实施例包括电流镜系统。 该系统包括主电路，其被配置为响应于激活信号的激活状态来传导第一电流。 该系统还包括被配置为响应于激活信号的激活状态产生至少一个第二附加电流的从电路。 所述至少一个附加电流中的每一个可以与第一电流成比例。 该系统还包括被配置为主电路的实质副本的电流路径电路，电流路径电路被配置为响应于激活信号的去激活状态来传导第一电流。

公开(公告)号：US5994951A

公开(公告)日：1999-11-30

申请号：US9063

申请日：1998-01-20

申请人： Salman Mazhar ,  Marius Dina ,  William W. Leake

发明人： Salman Mazhar ,  Marius Dina ,  William W. Leake

IPC分类号： H03H11/04 ,  H03K5/00

CPC分类号： H03H11/04

摘要： An integrated, tuning circuit for tuning a MOSFET-C filter contains a tuning MOSFET and a differential amplifier. A current source is connected to the drain of the tuning MOSFET. The output of the amplifier is coupled to the drain of the tuning MOSFET and to a terminal that connects to the drains of the MOSFETs of the filter, so that the equivalent resistance of the filter is dependant on the current. The current source is coupled to a reference current generator, such that current supplied by the current source to the tuning MOSFET is proportional to the current supplied in the reference current generator, which in turn varies with process and environmental conditions of a capacitance. As a result, changes in process and environmental conditions oppositely affect the capacitance and resistance in the filter, resulting in a fixed RC product and fixed frequency response from the filter.

摘要翻译： 用于调谐MOSFET-C滤波器的集成调谐电路包含调谐MOSFET和差分放大器。 电流源连接到调谐MOSFET的漏极。 放大器的输出端耦合到调谐MOSFET的漏极和连接到滤波器的MOSFET的漏极的端子，使得滤波器的等效电阻取决于电流。 电流源耦合到参考电流发生器，使得由电流源提供给调谐MOSFET的电流与参考电流发生器中提供的电流成比例，该电流随电容的过程和环境条件而变化。 因此，过程和环境条件的变化相反地影响滤波器的电容和电阻，从而产生固定的RC积和来自滤波器的固定频率响应。

公开(公告)号：US5982574A

公开(公告)日：1999-11-09

申请号：US953190

申请日：1997-10-17

申请人： William W. Leake ,  Salman Mazhar ,  Marius Dina ,  Graham Teague

发明人： William W. Leake ,  Salman Mazhar ,  Marius Dina ,  Graham Teague

IPC分类号： G11B5/58 ,  G11B5/588 ,  G11B5/584

CPC分类号： G11B5/58 ,  G11B5/588

摘要： An apparatus for demodulating two pilot tones for use by a servo control for a magnetic read head is disclosed. The apparatus provides positioning information to position the read head adjacent to a desired information track of a magnetic storage medium. The apparatus comprises a first and a second pilot tone demodulation unit. Each pilot tone demodulation unit comprises a band pass filter for providing a first filtered output signal having an amplitude and a phase representative of the first and the second frequency pilot tones, respectively. A delay lock loop receives the first filtered out of the band pass filter and determines a phase of the frequency pilot tone. A multiplier is connected to the output of the band pass filter and the output of the delay lock loop for multiplying the frequency pilot tone with the output signal of the delay lock loop. A low pass filter is connected to the output of the multiplier for filtering out undesired signals and for passing a DC signal. A comparator is used for comparing the first DC signal to the second DC signal and for determining a position of the magnetic read head with respect to a track of a magnetic storage medium.

摘要翻译： 公开了一种用于解调用于磁读头的伺服控制的两个导频音的装置。 该设备提供定位信息以将读取头与磁存储介质的期望信息轨道相邻。 该装置包括第一和第二导频音解调单元。 每个导频音解调单元包括带通滤波器，用于分别提供表示第一和第二频率导频音的振幅和相位的第一滤波输出信号。 延迟锁定环接收从带通滤波器滤出的第一滤波器，并确定频率导频音的相位。 乘法器连接到带通滤波器的输出端和延迟锁定环路的输出端，用于将频率导频音与延迟锁定环路的输出信号相乘。 低通滤波器连接到乘法器的输出端，用于滤除不想要的信号并传递直流信号。 比较器用于将第一DC信号与第二DC信号进行比较，并用于确定磁读取头相对于磁存储介质的磁道的位置。