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    • 5. 发明授权
    • Signal modulation scheme in class-D amplification and circuit therefor
    • D类放大及其电路中的信号调制方案
    • US07659789B2
    • 2010-02-09
    • US10596989
    • 2006-02-09
    • Hao ZhuHaibin HuangYongqing Ren
    • Hao ZhuHaibin HuangYongqing Ren
    • H03K7/08
    • H03F3/2173H03F2200/384
    • A class-D amplifier (10) includes a logic circuit (40) for controlling the operation of a switching bridge (11). The logic circuit (40) transmits the differential mode of a differential pulse width modulation input signal and deletes a central portion of the common mode of input signal, while preserving pulses of a minimum pulse width following a rising edge and preceding a falling edge in common mode of the input signal. Deleting the central portion of the common mode signal improves the efficiency and reduces the electromagnetic interference radiation of the class-D amplifier (10). Preserving the pulses of the minimum pulse width ensures the proper operation of the switching elements (12, 14, 16, 18) in the switching bridge (11), thereby reducing the distortion in the signal amplification.
    • D类放大器(10)包括用于控制开关桥(11)的操作的逻辑电路(40)。 逻辑电路(40)发送差分脉冲宽度调制输入信号的差分模式,并删除输入信号的共模输入的中心部分,同时保持在上升沿之后并且在下降沿之前的最小脉冲宽度的脉冲 模式的输入信号。 删除共模信号的中心部分提高了D类放大器(10)的效率并降低了电磁干扰辐射。 保持最小脉冲宽度的脉冲确保开关桥(11)中的开关元件(12,14,16,18)的适当操作,从而减少信号放大的失真。