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    • 3. 发明公开
    • Programmable frequency divider module with duty cycle close to fifty percent
    • 程式计算机频率计算器快速fünfzigProzent
    • EP2806562A1
    • 2014-11-26
    • EP13305661.4
    • 2013-05-22
    • Asahi Kasei Microdevices Corporation
    • Canard, DavidGervais, Didier
    • H03K21/00H03K23/00
    • H03K23/665H03K21/026
    • A programmable frequency divider module (10) is based on a programmable re-load counter (1) and a digital combination (11) comprising an N-bit adder. In a preferred implementation, a down-count from a division ratio value (R) down to one-value is repeated, and a down-count signal is added to an offset value itself determined as a function of the division ratio value. The adder carry generates a derived clock signal having a frequency equal to that of an initial clock signal divided by the division ratio value. Such frequency divider module produces the derived clock signal with low noise and duty cycle close to 50%. It is well adapted in particular for clocking analog-to-digital converters, digital-to-analog converters and phase-locked loop devices.
    • 可编程分频器模块(10)基于可编程重载计数器(1)和包括N位加法器的数字组合(11)。 在优选的实施方式中,重复从分频比值(R)下降到一值的递减计数,并将递减计数信号添加到作为分频比值的函数确定的偏移值本身。 加法器进位产生具有等于初始时钟信号的频率等于分频比的频率的导出时钟信号。 这种分频器模块产生低噪声和占空比接近50%的导出时钟信号。 它特别适用于时钟模数转换器,数模转换器和锁相环设备。