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1. 发明授权

US06320713B1 Ratio method for measurement of MR read head resistance 失效
标题翻译： MR读头电阻的测量比率方法
公开(公告)号：US06320713B1
公开(公告)日：2001-11-20
申请号：US09395147
申请日：1999-09-14
申请人： Larry LeeRoy Tretter , James Ernest Malmberg
发明人： Larry LeeRoy Tretter , James Ernest Malmberg
IPC分类号： G11B503
CPC分类号： G11B5/035 , G01R27/14 , G11B5/00813 , G11B5/012 , G11B5/40 , G11B5/455 , G11B33/10 , G11B2005/0016
摘要： A reference current and resistance is used to determine a reference voltage. A variable current is then applied to the MR read head, and is adjusted to produce a voltage equal to that of the reference voltage. Then, the known current and voltage is used to determine the resistance of the MR read head.
摘要翻译：参考电流和电阻用于确定参考电压。然后将可变电流施加到MR读取头，并被调整以产生等于参考电压的电压。然后，使用已知的电流和电压来确定MR读取头的电阻。

2. 发明授权

US06928581B1 Innovative bypass circuit for circuit testing and modification 失效
标题翻译：用于电路测试和修改的创新旁路电路
公开(公告)号：US06928581B1
公开(公告)日：2005-08-09
申请号：US09395854
申请日：1999-09-14
申请人： Larry LeeRoy Tretter , James Ernest Malmberg
发明人： Larry LeeRoy Tretter , James Ernest Malmberg
IPC分类号： G01R31/3167 , G01R31/317 , G06F11/00 , G06F11/267
CPC分类号： G06F11/267 , G01R31/3167 , G01R31/31707
摘要： An integrated circuit module is designed with bypass switches in critical places to route signals around specific circuit blocks, e.g. an automatic gain control (AGC) system and an anti-aliasing filter. If there had been significant problems with either block, it can be bypassed and tests of the remaining circuits are possible. This allows all circuits in the module to be tested in the initial pass, reducing the risk of needing a third pass after the known problems were fixed in the second pass. Additionally, the bypass circuits are useful at module production test and for diagnostics in the final product.
摘要翻译：集成电路模块设计有关键位置的旁路开关，用于在特定电路块周围路由信号，例如。自动增益控制（AGC）系统和抗混叠滤波器。如果任何一个块都存在重大问题，可以绕过它，并且剩余电路的测试是可能的。这允许在初始通过中对模块中的所有电路进行测试，在已知问题在第二次通过中被修复之后，减少需要第三遍的风险。此外，旁路电路可用于模块生产测试和最终产品中的诊断。

3. 发明授权

US06680809B1 Write head current damping with dynamic coupling 失效
标题翻译：用动态耦合写头电流阻尼
公开(公告)号：US06680809B1
公开(公告)日：2004-01-20
申请号：US09689376
申请日：2000-10-12
申请人： James Ernest Malmberg , Larry LeeRoy Tretter
发明人： James Ernest Malmberg , Larry LeeRoy Tretter
IPC分类号： G11B502
CPC分类号： G11B5/02 , G11B5/00813 , G11B2005/0013
摘要： A write head circuit is provided having improved transient and steady state response. The circuit includes a dynamically coupled damping circuit that is coupled to the write head during transient periods of a write signal to substantially reduce or eliminate overshoot generated by a write head cable. During steady state or data writing periods, the damping circuit is decoupled from the write head to prevent unnecessary loading of the write head. In preferred embodiments, the damping circuit includes a resistor in series with a capacitor, and the damping circuit is coupled in parallel to the write head. The resistor substantially reduces the overshoot of a write signal supplied to the write head, while the capacitor decouples the resistor from the write head during steady state or data write periods.
摘要翻译：提供具有改进的瞬态和稳态响应的写头电路。该电路包括动态耦合的阻尼电路，其在写入信号的瞬态期间耦合到写入头，以显着地减少或消除由写头电缆产生的过冲。在稳态或数据写入期间，阻尼电路与写头分离，以防止不必要的写入头负载。在优选实施例中，阻尼电路包括与电容器串联的电阻器，并且阻尼电路并联耦合到写入头。该电阻器基本上减小了提供给写入头的写入信号的过冲，同时电容器在稳定状态或数据写入周期期间使电阻器与写入头分离。

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