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    • 7. 发明专利
    • Δσ ad converter, class-d amplifier, and dc-dc converter
    • DeltaSigma AD转换器,CLASS-D放大器和DC-DC转换器
    • JP2008219324A
    • 2008-09-18
    • JP2007052299
    • 2007-03-02
    • Yamaha Corpヤマハ株式会社
    • MORISHIMA MORIHITO
    • H03M3/02H03F3/217H03K7/08
    • H02M3/157H03F3/2175H03M3/344H03M3/424H03M3/50
    • PROBLEM TO BE SOLVED: To provide a ΔΣ AD converter which can obtain a high dynamic range in a state that a sampling frequency of ΔΣ modulation is made to be comparatively low. SOLUTION: A subtractor 18 subtracts a feedback signal from an analog input signal. An integrator 20 integrates an output signal of the subtractor 18. A comparator 22 compares an output signal of the integrator 20 with a predetermined threshold value, and carries out binarization. A counter 24 counts a clock signal of a predetermined frequency, and measures each pulse width of an output signal of the comparator 22. Output data of the counter 24 are thinned by a predetermined sampling rate of a decimation filter 28 through a loop filter 26. Output data of the decimation filter 28 become AD conversion outputs. A PWM circuit 30 outputs an output signal of a predetermined period with a duty according to an output pulse of the loop filter 26, and the PWM signal is inputted to the subtractor 18 as the feedback signal. COPYRIGHT: (C)2008,JPO&INPIT
    • 要解决的问题:提供一种在ΔΣ调制的采样频率相对较低的状态下可以获得高动态范围的ΔΣAD转换器。 解决方案:减法器18从模拟输入信号中减去反馈信号。 积分器20对减法器18的输出信号进行积分。比较器22将积分器20的输出信号与预定阈值进行比较,并执行二值化。 计数器24对预定频率的时钟信号进行计数,并测量比较器22的输出信号的每个脉冲宽度。计数器24的输出数据通过环路滤波器26以抽取滤波器28的预定采样速率减薄。 抽取滤波器28的输出数据成为AD转换输出。 PWM电路30根据环路滤波器26的输出脉冲输出具有占空比的预定周期的输出信号,并将PWM信号作为反馈信号输入到减法器18。 版权所有(C)2008,JPO&INPIT