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    • 7. 发明公开
    • Method and circuit for determining a slow clock calibration factor
    • Verfahren und Anordnung zur Bestimmung eines Kalibrations-Faktorsfüreinen langsamen Takt
    • EP1585223A1
    • 2005-10-12
    • EP05252080.6
    • 2005-04-01
    • Integration Associates Inc.
    • Erdélyi, JànosOnody, Péter
    • H03L1/00H04B1/16
    • H03L1/00
    • Shown is a method and circuit for determining a calibration factor between a fast, high accuracy clock signal and a slow, low accuracy clock signal, which can be realised with a minimum number of electronic units, and which obtains the calibration factor in a very short time, thus minimising power consumption of the circuit. The present invention operates by counting the number of cycles of a high accuracy clock signal during a single cycle of a low accuracy clock signal to obtain a first number representing the number of cycles counted and then successively summing the first number until a sum of the first numbers reaches a first predetermined value. The count of the number of summing operations required to reach the first predetermined value is then used to determine the calibration parameter, which is proportional to the number of summing operations.
    • 显示了一种用于确定快速,高精度时钟信号与慢速,低精度时钟信号之间的校准因子的方法和电路,该信号可以用最小数量的电子单元实现,并且在非常短的时间内获得校准因子 时间,从而最小化电路的功耗。 本发明通过在低精度时钟信号的单个周期期间对高精度时钟信号的周期数进行计数来进行操作,以获得表示所计数的周期数的第一数字,然后对第一个数字进行连续求和,直到第一个 数字达到第一预定值。 然后使用达到第一预定值所需的求和操作次数的计数来确定与求和操作次数成比例的校准参数。
    • 8. 发明公开
    • Method and apparatus for isolation in a caller ID or call monitor interface circuit
    • 用于主叫识别或者电话覆盖接口电路的隔离的方法和装置
    • EP1450546A2
    • 2004-08-25
    • EP04003839.0
    • 2004-02-20
    • Integration Associates Inc.
    • Holcombe, Wayne T.Konecny, Pavel
    • H04M1/57
    • H04M1/573
    • A caller ID circuit is shown that uses resistors as a caller ID interface to a telephone line pair. The circuit includes a differential transconductance amplifier coupled to the telephone line pair using resistors and a common mode canceling transconductance amplifier coupled to the telephone line pair using the resistors. The invention also includes a gyrator transconductance amplifier coupled to the differential transconductance amplifier and the common mode canceling transconductance amplifier that is configured to generate an output current corresponding to a caller ID signal present at the telephone line pair. In a further refinement of the invention, the resistors are accurate resistors. In another refinement of the invention, the circuit further includes an analog to digital converter (ADC) coupled to the gyrator transconductance amplifier, where the ADC converts the output current from the gyrator transconductance amplifier into a pulse-width-modulated (PWM) signal.
    • 呼叫者ID电路示那样使用电阻器作为呼叫者ID接口到电话线对。 所述电路包括耦合到使用电阻器的电话线对和连接到使用电阻电话线对的共同模式取消跨导放大器的差分跨导放大器。 因此本发明包括耦合到所述差分跨导放大器和取消跨导放大器的共模也被配置成在输出电流对应于主叫方ID存在于电话线对的信号,以产生一个回转器跨导放大器。 在本发明的进一步改进中,所述电阻器是精确的电阻器。 在本发明的另一改进中,所述电路还包括:模拟到耦合到回转器跨导放大器,其中,所述ADC从回转器跨导放大器的输出电流转换成脉冲宽度调制(PWM)信号的数字转换器(ADC)。