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    • 5. 发明申请
    • Impedance adjustment circuit
    • 阻抗调节电路
    • US20090212816A1
    • 2009-08-27
    • US12379464
    • 2009-02-23
    • Hiromu KatoMasahiro Takeuchi
    • Hiromu KatoMasahiro Takeuchi
    • H03H11/30H03H11/02H03K19/003
    • H03H7/40
    • Disclosed is an impedance adjustment circuit including a comparator and a resistor control circuit. The comparator compares the resistance value of an external resistor and that of a replica resistor that forms a replica of a terminal resistor. The resistor control circuit includes a replica resistor control counter, a resistor-under-adjustment control signal holding circuit and a monitor circuit. The replica resistor control counter counts up and down based on the comparison result by the comparator to output a control signal to the replica resistor. The resistor-under-adjustment control signal holding circuit holds a control signal that is delivered to the terminal resistor. The monitor circuit receives the state of the counter and an output of the retention circuit and, in case the difference between the count state of the replica resistor control counter and an output of the resistor-under-adjustment control signal holding circuit is within a preset range, delivers the output of the resistor-under-adjustment control signal holding circuit as an input to the resistor-under-adjustment control signal holding circuit.
    • 公开了一种包括比较器和电阻器控制电路的阻抗调节电路。 比较器比较外部电阻的电阻值和形成端子电阻的复制品的复制电阻的电阻值。 电阻控制电路包括复制电阻控制计数器,电阻调节下调控制信号保持电路和监视电路。 复制电阻控制计数器根据比较器的比较结果向上和向下计数,以将控制信号输出到复制电阻。 电阻调节下调节控制信号保持电路保持传送到端子电阻器的控制信号。 监视电路接收计数器的状态和保持电路的输出,并且在复制电阻控制计数器的计数状态与电阻调节不足调整控制信号保持电路的输出之间的差在预设值 将电阻调节不足的控制信号保持电路的输出作为输入提供给电阻调整不足的控制信号保持电路。