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公开(公告)号：US08861748B2
公开(公告)日：2014-10-14
申请号：US13303007
申请日：2011-11-22
CPC分类号： H03F3/2178
摘要： Disclosed is a class D amplifier comprising a modulation stage having a first input for receiving an input signal and an output for producing a modulated version of the input signal; a plurality of power stages, each power stage being responsive to said modulation stage and comprising a first switch and a second switch coupled in series between a first voltage source and a second voltage source, each power stage comprising an output node between the first switch and the second switch; and a power stage control circuit for measuring the input signal level and enabling a selected number of the power stages as a function of the measured input signal level. A method for controlling such a class D amplifier is also disclosed.
摘要翻译： 公开了一种D类放大器，其包括具有用于接收输入信号的第一输入端和用于产生输入信号的调制版本的输出的调制级; 多个功率级，每个功率级响应于所述调制级并且包括串联耦合在第一电压源和第二电压源之间的第一开关和第二开关，每个功率级包括第一开关和第二开关之间的输出节点 第二个开关; 以及功率级控制电路，用于测量输入信号电平并且使得所选择的功率级数量作为测量的输入信号电平的函数。 还公开了一种用于控制这种D类放大器的方法。
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公开(公告)号：US20120134514A1
公开(公告)日：2012-05-31
申请号：US13303007
申请日：2011-11-22
CPC分类号： H03F3/2178
摘要： Disclosed is a class D amplifier comprising a modulation stage having a first input for receiving an input signal and an output for producing a modulated version of the input signal; a plurality of power stages, each power stage being responsive to said modulation stage and comprising a first switch and a second switch coupled in series between a first voltage source and a second voltage source, each power stage comprising an output node between the first switch and the second switch; and a power stage control circuit for measuring the input signal level and enabling a selected number of the power stages as a function of the measured input signal level. A method for controlling such a class D amplifier is also disclosed.
摘要翻译： 公开了一种D类放大器，其包括具有用于接收输入信号的第一输入端和用于产生输入信号的调制版本的输出的调制级; 多个功率级，每个功率级响应于所述调制级并且包括串联耦合在第一电压源和第二电压源之间的第一开关和第二开关，每个功率级包括第一开关和第二开关之间的输出节点 第二个开关; 以及功率级控制电路，用于测量输入信号电平并且使得所选择的功率级数量作为测量的输入信号电平的函数。 还公开了一种用于控制这种D类放大器的方法。
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公开(公告)号：US20090315623A1
公开(公告)日：2009-12-24
申请号：US12307457
申请日：2007-07-04
IPC分类号： H03F3/217
CPC分类号： H03F3/217 , H03F2200/345 , H03F2200/351 , H03F2200/66 , H03F2200/78 , H03G11/008
摘要： 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).
摘要翻译： 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;驱动单元（14），用于根据比较器信号产生驱动信号;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）包括用于控制脉宽调制输出信号（Vout）的占空比的限幅控制单元（10）。
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公开(公告)号：US20110012677A1
公开(公告)日：2011-01-20
申请号：US12835765
申请日：2010-07-14
IPC分类号： H03F3/217
CPC分类号： H03F3/2173
摘要： A switching amplifier comprising: an output driving circuit (400) including a pair of switching transistors (M1, M2) connected in series between a pair of supply voltage lines (VP, gnd); a switch driver circuit (204a) configured to drive the switching transistors (M1, M2) with first and second respective PWM signals dependent on an input signal (101); an output connection between the pair of transistors (M1, M2) for driving an output load (403); and an output current sensing circuit for measuring a current through the output load, the output current sensing circuit comprising: a current sensing resistor (401a) connected between a first one (M2) of the pair of transistors and an adjacent supply voltage line (gnd); and a voltage sense circuit (404) connected across the current sensing resistor, wherein the voltage sense circuit is configured to sample a voltage across the current sensing resistor (401a) at a midpoint of successive corresponding portions of one of the PWM signals.
摘要翻译： 一种开关放大器，包括：输出驱动电路（400），包括串联连接在一对电源电压线（VP，gnd）之间的一对开关晶体管（M1，M2） 开关驱动器电路（204a），被配置为利用取决于输入信号（101）的第一和第二相应的PWM信号驱动开关晶体管（M1，M2）; 用于驱动输出负载（403）的一对晶体管（M1，M2）之间的输出连接; 以及输出电流检测电路，用于测量通过所述输出负载的电流，所述输出电流检测电路包括：连接在所述一对晶体管的第一个（M2）和相邻电源电压线（gnd）之间的电流感测电阻器（401a） ）; 以及连接在所述电流感测电阻器两端的电压检测电路（404），其中所述电压检测电路被配置为在所述PWM信号之一的连续对应部分的中点处对所述电流感测电阻器（401a）两端的电压进行采样。
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公开(公告)号：US08378745B2
公开(公告)日：2013-02-19
申请号：US12835765
申请日：2010-07-14
IPC分类号： H03F3/217
CPC分类号： H03F3/2173
摘要： A switching amplifier comprising: an output driving circuit (400) including a pair of switching transistors (M1, M2) connected in series between a pair of supply voltage lines (VP, gnd); a switch driver circuit (204a) configured to drive the switching transistors (M1, M2) with first and second respective PWM signals dependent on an input signal (101); an output connection between the pair of transistors (M1, M2) for driving an output load (403); and an output current sensing circuit for measuring a current through the output load, the output current sensing circuit comprising: a current sensing resistor (401a) connected between a first one (M2) of the pair of transistors and an adjacent supply voltage line (gnd); and a voltage sense circuit (404) connected across the current sensing resistor, wherein the voltage sense circuit is configured to sample a voltage across the current sensing resistor (401a) at a midpoint of successive corresponding portions of one of the PWM signals.
摘要翻译： 一种开关放大器，包括：输出驱动电路（400），包括串联连接在一对电源电压线（VP，gnd）之间的一对开关晶体管（M1，M2） 开关驱动器电路（204a），被配置为利用取决于输入信号（101）的第一和第二相应的PWM信号驱动开关晶体管（M1，M2）; 用于驱动输出负载（403）的一对晶体管（M1，M2）之间的输出连接; 以及输出电流检测电路，用于测量通过所述输出负载的电流，所述输出电流检测电路包括：连接在所述一对晶体管的第一个（M2）和相邻电源电压线（gnd）之间的电流感测电阻器（401a） ）; 以及连接在所述电流感测电阻器两端的电压检测电路（404），其中所述电压检测电路被配置为在所述PWM信号之一的连续对应部分的中点处对所述电流感测电阻器（401a）两端的电压进行采样。
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