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1. 发明授权

US5182477A Bipolar tunable transconductance element 失效
标题翻译：双极可调谐跨导元件
公开(公告)号：US5182477A
公开(公告)日：1993-01-26
申请号：US823067
申请日：1992-01-14
申请人： Richard G. Yamasaki , Geert A. De Veirman
发明人： Richard G. Yamasaki , Geert A. De Veirman
IPC分类号： H03F1/32 , H03F3/45
CPC分类号： H03F3/45071 , H03F1/3211 , H03H11/0422 , H03H11/0433
摘要： The present invention is a new design for transconductance elements useful in high-frequency filters such as fully differential state-variable biquads. The present invention enjoys a large dynamic range. It is built with simple circuitry to reduce parasitic capacitance which impedes high-frequency operation. It is easily tunable for use in programmable filters. It is configured in a fully differential circuit and operates on five volts. The present invention is also very useful for implementing dual-input or multiple input transconductance elements. By incorporating additional current sources in the present invention, another degree of freedom is added to the determination of pole frequency and pole quality factors, when the transconductance is used as a biquad filter building block.
摘要翻译：本发明是用于跨频元件的新设计，其用于高频滤波器，例如全差分状态变量二乘法。本发明具有较大的动态范围。它采用简单的电路构建，以减少阻碍高频操作的寄生电容。它易于调节用于可编程滤波器。它配置在全差分电路中，工作在五伏。本发明对于实现双输入或多输入跨导元件也是非常有用的。通过在本发明中引入额外的电流源，当跨导用作双二阶滤波器构建块时，另外的自由度被添加到极点频率和极点质量因子的确定。

2. 发明授权

US6147828A Method and apparatus for reducing asymmetry in a signal from a magneto-resistive read head 失效
标题翻译：降低来自磁阻读取头的信号不对称性的方法和装置
公开(公告)号：US6147828A
公开(公告)日：2000-11-14
申请号：US34858
申请日：1998-03-04
申请人： Bryan E. Bloodworth , Davy H. Choi , Patrick P. Siniscalchi , Geert A. De Veirman
发明人： Bryan E. Bloodworth , Davy H. Choi , Patrick P. Siniscalchi , Geert A. De Veirman
IPC分类号： G11B5/00 , G11B5/012 , G11B5/02 , G11B20/10 , G11B20/22 , G11B5/035
CPC分类号： G11B5/02 , G11B20/10009 , G11B20/10027 , G11B20/10046 , G11B20/22 , G11B2005/0016 , G11B5/012
摘要： A hard disk drive system (10) includes a read/write head (21) for reading and writing data to and from a rotating magnetic disk (12). The read/write head includes a portion which is a magneto-resistive read head (36), the output of which is supplied through a preamplifier (26) to a read channel circuit (27). The read head has a nonlinear transfer function. The read channel circuit includes an asymmetry compensation circuit (62), which generates an analog compensation signal by squaring an output signal from the read head and scaling by an asymmetry factor (.alpha.'). The analog compensation signal is combined with the analog output signal in order to obtain a corrected analog signal, which is substantially free of the distortion introduced by the read head.
摘要翻译：硬盘驱动器系统（10）包括用于向和从旋转磁盘（12）读取和写入数据的读/写头（21）。读/写头包括作为磁阻读头（36）的部分，其输出通过前置放大器（26）提供给读通道电路（27）。读头具有非线性传递函数。读通道电路包括不对称补偿电路（62），其通过对来自读头的输出信号进行平方并通过不对称因子（α'）进行缩放来产生模拟补偿信号。模拟补偿信号与模拟输出信号组合，以获得校正的模拟信号，其基本上不受读头引入的失真。

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