公开(公告)号：US07180365B2

公开(公告)日：2007-02-20

申请号：US11124530

申请日：2005-05-06

Applicant: Jae-Wook Lee ,  Goog-Chun Cho

Inventor： Jae-Wook Lee ,  Goog-Chun Cho

IPC: H03F3/38

CPC classification number: H03F3/217 ,  H03F2200/331

Abstract: A class D amplifier and a method of pulse width modulation are provided. The class D amplifier includes a sigma delta modulator, a reference signal generator, a pulse width modulator and an amplifier. The sigma delta modulator converts an M bit input signal into N bit pulse code modulation data (M and N are integers and M>N). The reference signal generator counts a system clock and generates an N bit reference signal having 2N data blocks in a sampling period of the pulse code modulation data. The pulse width modulator generates a plurality of pulse width modulation signals having at least two switching periods within the sampling period of the pulse code modulation data. The pulse width modulation signals have pulse widths varied based on a unit time interval of the reference signal. The unit time interval corresponds to one of the data blocks of the reference signal.

Abstract translation: 提供D类放大器和脉冲宽度调制方法。 D类放大器包括一个Σ-Δ调制器，一个参考信号发生器，一个脉宽调制器和一个放大器。 Σ-Δ调制器将M位输入信号转换成N位脉冲码调制数据（M和N是整数，M> N）。 参考信号发生器对系统时钟进行计数，并在脉冲编码调制数据的采样周期中产生具有2个N个数据块的N位参考信号。 脉宽调制器产生在脉冲编码调制数据的采样周期内具有至少两个切换周期的多个脉宽调制信号。 脉冲宽度调制信号具有基于参考信号的单位时间间隔而变化的脉冲宽度。 单位时间间隔对应于参考信号的数据块之一。

公开(公告)号：US20050264350A1

公开(公告)日：2005-12-01

申请号：US11124530

申请日：2005-05-06

Applicant: Jae-Wook Lee ,  Goog-Chun Cho

Inventor： Jae-Wook Lee ,  Goog-Chun Cho

IPC: H03K5/04 ,  H03F3/217 ,  H03F3/38 ,  H03K7/08 ,  H03M7/32

CPC classification number: H03F3/217 ,  H03F2200/331

Abstract: A class D amplifier and a method of pulse width modulation are provided. The class D amplifier includes a sigma delta modulator, a reference signal generator, a pulse width modulator and an amplifier. The sigma delta modulator converts an M bit input signal into N bit pulse code modulation data (M and N are integers and M>N). The reference signal generator counts a system clock and generates an N bit reference signal having 2N data blocks in a sampling period of the pulse code modulation data. The pulse width modulator generates a plurality of pulse width modulation signals having at least two switching periods within the sampling period of the pulse code modulation data. The pulse width modulation signals have pulse widths varied based on a unit time interval of the reference signal. The unit time interval corresponds to one of the data blocks of the reference signal.

Abstract translation: 提供D类放大器和脉冲宽度调制方法。 D类放大器包括一个Σ-Δ调制器，一个参考信号发生器，一个脉宽调制器和一个放大器。 Σ-Δ调制器将M位输入信号转换成N位脉冲码调制数据（M和N是整数，M> N）。 参考信号发生器对系统时钟进行计数，并在脉冲编码调制数据的采样周期中产生具有2个N个数据块的N位参考信号。 脉宽调制器产生在脉冲编码调制数据的采样周期内具有至少两个切换周期的多个脉宽调制信号。 脉冲宽度调制信号具有基于参考信号的单位时间间隔而变化的脉冲宽度。 单位时间间隔对应于参考信号的数据块之一。

公开(公告)号：US06952131B2

公开(公告)日：2005-10-04

申请号：US10912436

申请日：2004-08-05

Applicant: Jae-Hoon Jeong ,  Goog-Chun Cho ,  Bo-Hyung Cho ,  Chang-Gyun Kim ,  Jong-Hu Park

Inventor： Jae-Hoon Jeong ,  Goog-Chun Cho ,  Bo-Hyung Cho ,  Chang-Gyun Kim ,  Jong-Hu Park

IPC: H03K7/08 ,  H03F3/217 ,  H03F3/38

CPC classification number: H03F3/217

Abstract: Disclosed is a digital PWM input D class amplifier by PWM negative feedback. The amplifier includes: digital modulation part for modulating PCM signal of input audio to PWM signal; pulse width generating and correcting part for comparing difference between the PWM signal and output signal negatively fed back, with PWM ramp signal to generate PWM switching signal; output part for generating an amplified output audio signal in response to the PWM switching signal of the pulse width generating and correcting part; and voltage negative feedback loop for negatively feeding back signal of the output part and decreasing a harmonic component to provide the signal to the pulse width generating and correcting part. Thus, the invention compares the negative feedback signal with positive/negative (+/−) saw tooth PWM ramp signal to control On/Off time period of switching transistor and the PWM pulse width and thereby enhance the linearity of the output PWM.

Abstract translation: 公开了通过PWM负反馈的数字PWM输入D类放大器。 放大器包括：用于将输入音频的PCM信号调制为PWM信号的数字调制部分; 脉冲宽度产生和校正部分，用于比较PWM信号和负反馈的输出信号之间的差异，并用PWM斜坡信号产生PWM开关信号; 输出部分，用于响应于脉冲宽度产生和校正部分的PWM切换信号产生放大的输出音频信号; 和电压负反馈环路，用于对输出部分的信号进行负反馈，并减小谐波分量，以向脉冲宽度产生和校正部分提供信号。 因此，本发明将负反馈信号与正/负（+/-）锯齿PWM斜坡信号进行比较，以控制开关晶体管的开/关时间和PWM脉冲宽度，从而增强输出PWM的线性度。

公开(公告)号：US07113030B2

公开(公告)日：2006-09-26

申请号：US10821527

申请日：2004-04-09

Applicant: Chung-Gil Yang ,  Jae-Hoon Jeong ,  Goog-Chun Cho

Inventor： Chung-Gil Yang ,  Jae-Hoon Jeong ,  Goog-Chun Cho

IPC: H03F3/38

CPC classification number: H03F3/217

Abstract: A class-D power amplifier, which prevents excessive response phenomenon from occurring when returning to a steady state from an abnormal state and an amplification method of the class-D power amplifier are provided. The class-D power amplifier prevents an integral control circuit or a proportional integral control circuit from becoming saturated by using sub-negative feedback loop operations, without using a high-capacity output blocking switch in an initial state or an abnormal state. Thus, suppressing pop noise due to the excessive response phenomenon caused when the class-D power amplifier returns to the steady state from the initial state or the abnormal state and reducing power consumption.

Abstract translation: D类功率放大器能够防止从异常状态返回到稳定状态时产生过大的响应现象，并且提供D类功率放大器的放大方法。 D类功率放大器通过使用次级负反馈环路操作来防止积分控制电路或比例积分控制电路饱和，而不会在初始状态或异常状态下使用高容量输出阻塞开关。 因此，抑制由D类功率放大器从初始状态或异常状态恢复到稳定状态时引起的过度响应现象引起的弹出噪声，并降低功耗。

公开(公告)号：US20050012546A1

公开(公告)日：2005-01-20

申请号：US10912436

申请日：2004-08-05

Applicant: Jae-Hoon Jeong ,  Goog-Chun Cho ,  Bo-Hyung Cho ,  Chang-Gyun Kim ,  Jong-Hu Park

Inventor： Jae-Hoon Jeong ,  Goog-Chun Cho ,  Bo-Hyung Cho ,  Chang-Gyun Kim ,  Jong-Hu Park

IPC: H03K7/08 ,  H03F3/217 ,  H03F3/38

CPC classification number: H03F3/217

Abstract: Disclosed is a digital PWM input D class amplifier by PWM negative feedback. The amplifier includes: digital modulation part for modulating PCM signal of input audio to PWM signal; pulse width generating and correcting part for comparing difference between the PWM signal and output signal negatively fed back, with PWM ramp signal to generate PWM switching signal; output part for generating an amplified output audio signal in response to the PWM switching signal of the pulse width generating and correcting part; and voltage negative feedback loop for negatively feeding back signal of the output part and decreasing a harmonic component to provide the signal to the pulse width generating and correcting part. Thus, the invention compares the negative feedback signal with positive/negative (+/−) saw tooth PWM ramp signal to control On/Off time period of switching transistor and the PWM pulse width and thereby enhance the linearity of the output PWM.

Abstract translation: 公开了通过PWM负反馈的数字PWM输入D类放大器。 放大器包括：用于将输入音频的PCM信号调制为PWM信号的数字调制部分; 脉冲宽度产生和校正部分，用于比较PWM信号和负反馈的输出信号之间的差异，并用PWM斜坡信号产生PWM开关信号; 输出部分，用于响应于脉冲宽度产生和校正部分的PWM切换信号产生放大的输出音频信号; 和电压负反馈环路，用于对输出部分的信号进行负反馈，并减小谐波分量，以向脉冲宽度产生和校正部分提供信号。 因此，本发明将负反馈信号与正/负（+/-）锯齿PWM斜坡信号进行比较，以控制开关晶体管的开/关时间和PWM脉冲宽度，从而增强输出PWM的线性度。