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    • 1. 发明申请
    • CLASS D AUDIO AMPLIFIER
    • CLASS D音频放大器
    • WO2008007308A1
    • 2008-01-17
    • PCT/IB2007/052614
    • 2007-07-04
    • NXP B.V.DOOPER, LutsenBERKHOUT, Marco
    • DOOPER, LutsenBERKHOUT, Marco
    • H03F3/217H03G3/30H03G11/00
    • H03F3/217H03F2200/345H03F2200/351H03F2200/66H03F2200/78H03G11/008
    • A class D amplifier (1) comprises an input unit (11) for receiving a digital input signal (Vin), a pulse shaping unit (12) for producing pulse shaped signals in dependence of the input signal (Vin), a comparator unit (13) for comparing the pulse shaped signals and producing a comparator signal, a driver unit (14) for producing driver signals in dependence of the comparator signal, a switching output unit (15) for producing a pulse width modulated output signal (Vout) in dependence of the driver signals, and a feedback unit (16) for feeding the output signal (Vout) back to the pulse shaping unit (12). The input unit (11) comprises a clipping control unit (10) for controlling the duty cycle of the pulse width modulated output signal (Vout).
    • D类放大器(1)包括用于接收数字输入信号(Vin)的输入单元(11),用于根据输入信号(Vin)产生脉冲形信号的脉冲整形单元(12),比较器单元 13),用于比较脉冲形状信号并产生比较器信号;驱动器单元(14),用于根据比较器信号产生驱动器信号;切换输出单元(15),用于产生脉宽调制输出信号 驱动器信号的依赖性,以及用于将输出信号(Vout)馈送回脉冲整形单元(12)的反馈单元(16)。 输入单元(11)包括用于控制脉冲宽度调制输出信号(Vout)的占空比的限幅控制单元(10)。
    • 6. 发明申请
    • OUTPUT CIRCUITS WITH CLASS D AMPLIFIER
    • 具有D类放大器的输出电路
    • WO2008144134A1
    • 2008-11-27
    • PCT/US2008/060232
    • 2008-04-14
    • QUALCOMM IncorporatedWALKER, Brett C.SHI, Song Stone
    • WALKER, Brett C.SHI, Song Stone
    • H03F3/217
    • H03F3/217H03F2200/03H03F2200/345H03F2200/351
    • Output circuits using pulse width modulation (PWM) and/or pulse density modulation (PDM) are described. In one aspect, a PWM output circuit includes a PWM modulator that operates based on a square wave signal instead of a sawtooth or triangular wave signal. In another aspect, a PDM output circuit includes a PDM modulator that uses variable reference voltages to reduce variations in switching frequency. In yet another aspect, a dual-mode output circuit supports both PWM and PDM and includes a pulse modulator and a class D amplifier. The pulse modulator performs PWM on an input signal if a PWM mode is selected and performs PDM on the input signal if a PDM mode is selected. The class D amplifier receives a driver signal from the pulse modulator and generates an output signal.
    • 描述使用脉冲宽度调制(PWM)和/或脉冲密度调制(PDM)的输出电路。 一方面,PWM输出电路包括基于方波信号而不是锯齿波或三角波信号进行操作的PWM调制器。 在另一方面,PDM输出电路包括使用可变参考电压以减少开关频率变化的PDM调制器。 在另一方面,双模输出电路支持PWM和PDM,并且包括脉冲调制器和D类放大器。 如果选择了PWM模式,则脉冲调制器对输入信号执行PWM,如果选择了PDM模式,则在输入信号上执行PDM。 D类放大器从脉冲调制器接收驱动信号并产生一个输出信号。