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    • 9. 发明授权
    • System and method for dynamic impedance matching
    • 动态阻抗匹配的系统和方法
    • US07068065B1
    • 2006-06-27
    • US10830339
    • 2004-04-22
    • Jawad Nasrullah
    • Jawad Nasrullah
    • H03K17/16
    • H03K19/0005
    • An integrated circuit provides dynamic, on chip resistor trimming, including a digital control loop for stabilizing impedance matching among multiple devices communicatively linked over a data transmission line. The digital control loop stabilizes input/output impedance matching of various devices to within a precise ohmic range that is far narrower than standard process variations, such as sheet resistance, within the components themselves. The impedance matching circuit also overcomes EMI problems normally associated with digital control and thus provides dynamic on-chip digital control without non-linearity and with tighter tolerance than is presently possible. Accordingly, the circuit boosts performance of peripheral devices that communicate over a standard USB port, without the need for a computer as a go between or intermediate interface. This makes device to device communication possible as between USB On-the-Go capable devices.
    • 集成电路提供动态片上电阻微调,包括数字控制回路,用于稳定通过数据传输线通信连接的多个设备之间的阻抗匹配。 数字控制回路将各种器件的输入/输出阻抗匹配稳定在精确的欧姆范围内,该精确的欧姆范围比组件本身内的标准工艺变化(如薄层电阻)要窄得多。 阻抗匹配电路还克服了通常与数字控制相关的EMI问题,从而提供动态的片上数字控制,无需非线性并且比目前可能的更严格的公差。 因此,该电路提高了通过标准USB端口进行通信的外围设备的性能,而不需要计算机作为中间接口之间或中间接口。 这使得设备到设备之间的通信成为USB On-the-Go设备之间的可能。