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1. 发明授权

US09287888B2 Converter with an additional DC offset and method thereof 有权
标题翻译：具有附加DC偏移的转换器及其方法
公开(公告)号：US09287888B2
公开(公告)日：2016-03-15
申请号：US14588816
申请日：2015-01-02
申请人： Realtek Semiconductor Corp.
发明人： Ming-Cheng Chiang , Wei-Cheng Tang
IPC分类号： H03M1/06 , H03M1/08 , H03M1/18 , H03M1/70
CPC分类号： H03M1/0845 , H03M1/183 , H03M1/70 , H03M3/356 , H03M3/422 , H03M3/458 , H03M3/50
摘要： A converter with an additional DC offset includes a switch circuit, a first capacitor, a plurality of additional capacitor cells and an operational amplifier. The converter uses a first additional capacitor cell and a second additional capacitor cell having a capacitor difference with the first additional capacitor to store two charges having different polarity and magnitude with each other, and further generate an inverted DC offset according to a difference between the two charges to compensate a DC offset.
摘要翻译：具有附加DC偏移的A转换器包括开关电路，第一电容器，多个附加电容器单元和运算放大器。转换器使用第一附加电容器单元和具有与第一附加电容器的电容器差异的第二附加电容器单元来存储彼此具有不同极性和大小的两个电荷，并且还根据两者之间的差异产生反相DC偏移充电以补偿DC偏移。

2. 发明申请

US20180109232A1 AMPLIFIER DEVICE 有权
公开(公告)号：US20180109232A1
公开(公告)日：2018-04-19
申请号：US15294871
申请日：2016-10-17
申请人： Realtek Semiconductor Corp.
发明人： Ming-Cheng Chiang , Yan-Yu Lin
IPC分类号： H03F3/45 , H03F3/183
CPC分类号： H03F3/45475 , H03F3/187 , H03F3/45 , H03F3/45941 , H03F3/45946 , H03F2200/03 , H03F2200/165 , H03F2200/261 , H03F2200/267 , H03F2200/48 , H03F2203/45114 , H03F2203/45138 , H03F2203/45151 , H03F2203/45222 , H03F2203/45418 , H03F2203/45424
摘要： An amplifier device includes an amplifier circuit, a feedback circuit, and a filter circuit. The amplifier circuit is configured to receive an input signal and a filtered signal, and to output a first output signal and a second output signal at a first output terminal and a second output terminal respectively. The first output signal and the second output signal are a pair of differential signals. The feedback circuit is configured to set direct current (DC) voltage levels of the first output signal and the second output signal to be at a predetermined voltage. The filter circuit is configured to low-pass filter the input signal or to low-pass filter the pair of differential signals so as to generate the filtered signal, and is configured to output the filtered signal to the amplifier circuit.

3. 发明申请

US20140167993A1 HYBRID DIGITAL-TO-ANALOG CONVERTER AND METHOD THEREOF 有权
标题翻译：混合数字到模拟转换器及其方法
公开(公告)号：US20140167993A1
公开(公告)日：2014-06-19
申请号：US14098579
申请日：2013-12-06
申请人： REALTEK SEMICONDUCTOR CORP.
发明人： Ming-Cheng Chiang , Li-Lung Kao
IPC分类号： H03M1/08
CPC分类号： H03M1/089 , G09G3/3648 , H03M1/00 , H03M1/0665 , H03M1/68 , H03M1/747 , H03M1/806 , H03M3/30 , H03M3/502
摘要： Hybrid digital-to-analog converter and method thereof are provided. The hybrid digital-to-analog converter (DAC) includes a data processor, at least one first type DAC, at least one second type DAC, and an output circuit. The data processor processes an input digital signal to output at least one of first and second digital signals which are related to a higher bit portion and a lower bit portion of the input digital signal, respectively. If the data processor outputs the first digital signal to the first type DAC, the first type DAC converts the first digital signal. The at least one second type DAC receives and converts the second digital signal outputted from the data processor. The output circuit receives at least one output signal of the first and the second type DACs to output an output analog signal.
摘要翻译：提供了混合数模转换器及其方法。混合数模转换器（DAC）包括数据处理器，至少一个第一类型DAC，至少一个第二类型DAC和输出电路。数据处理器处理输入数字信号以分别输出与输入数字信号的较高位部分和较低位部分相关的第一和第二数字信号中的至少一个。如果数据处理器将第一数字信号输出到第一类型DAC，则第一类DAC转换第一数字信号。所述至少一个第二类型DAC接收并转换从数据处理器输出的第二数字信号。输出电路接收第一和第二类型DAC的至少一个输出信号以输出输出模拟信号。

4. 发明授权

US09826305B2 Controlling voltage of a speaker based on temperature 有权
公开(公告)号：US09826305B2
公开(公告)日：2017-11-21
申请号：US14645152
申请日：2015-03-11
申请人： Realtek Semiconductor Corp.
发明人： Yi-Chang Tu , Chao-Wei Chang , Ming-Cheng Chiang
IPC分类号： H03G11/00 , H04R3/00 , H04R29/00
CPC分类号： H04R3/00 , H04R3/007 , H04R29/001
摘要： An audio device includes a digital-to-analog converter, an amplifier, a speaker, a power management unit and a temperature sensor. The digital-to-analog converter is configured to convert a digital audio signal into an analog audio signal. The amplifier is coupled to the digital-to-analog converter and configured to amplify the analog audio signal and generate an amplified analog audio signal. The speaker is coupled to the amplifier and configured to broadcast the amplified analog audio signal. The power management unit is configured to provide the amplifier with a first working voltage and provide the digital-to-analog converter with a second working voltage. The temperature sensor is coupled to the speaker and configured to generate a temperature detection signal according to a temperature of the speaker. Wherein, the power management unit adjusts at least one of the first working voltage and the second working voltage according to the temperature detection signal.

5. 发明授权

US09973160B2 Amplifier device 有权
公开(公告)号：US09973160B2
公开(公告)日：2018-05-15
申请号：US15294871
申请日：2016-10-17
申请人： Realtek Semiconductor Corp.
发明人： Ming-Cheng Chiang , Yan-Yu Lin
IPC分类号： H03F3/45 , H03F3/183
CPC分类号： H03F3/45475 , H03F3/187 , H03F3/45 , H03F3/45941 , H03F3/45946 , H03F2200/03 , H03F2200/165 , H03F2200/261 , H03F2200/267 , H03F2200/48 , H03F2203/45114 , H03F2203/45138 , H03F2203/45151 , H03F2203/45222 , H03F2203/45418 , H03F2203/45424
摘要： An amplifier device includes an amplifier circuit, a feedback circuit, and a filter circuit. The amplifier circuit is configured to receive an input signal and a filtered signal, and to output a first output signal and a second output signal at a first output terminal and a second output terminal respectively. The first output signal and the second output signal are a pair of differential signals. The feedback circuit is configured to set direct current (DC) voltage levels of the first output signal and the second output signal to be at a predetermined voltage. The filter circuit is configured to low-pass filter the input signal or to low-pass filter the pair of differential signals so as to generate the filtered signal, and is configured to output the filtered signal to the amplifier circuit.

6. 发明授权

US09826312B2 Circuit and method for driving a loudspeaker 有权
公开(公告)号：US09826312B2
公开(公告)日：2017-11-21
申请号：US14527960
申请日：2014-10-30
申请人： REALTEK SEMICONDUCTOR CORP.
发明人： Ming-Cheng Chiang , Chia-Chi Tsai
IPC分类号： H04R29/00 , H04R5/04 , H04R3/00 , H03F3/217
CPC分类号： H04R5/04 , H03F3/217 , H04R3/00 , H04R29/001
摘要： A circuit for driving a loudspeaker is disclosed. The circuit includes: a signal generator connected to the loudspeaker, generating a first signal comprising a first pulse with positive value and a second pulse with negative value; a detection circuit connected to the loudspeaker, detecting a second signal produced by the loudspeaker in response to the first signal; and a processing circuit connected to the signal generator and the detection circuit, calculating the impedance of the loudspeaker according to the second signal; wherein each pulse width of the first and second pulses is between 100 ns and 900 ns.

7. 发明授权

US08866656B2 Hybrid digital-to-analog converter and method thereof 有权
标题翻译：混合数模转换器及其方法
公开(公告)号：US08866656B2
公开(公告)日：2014-10-21
申请号：US14098579
申请日：2013-12-06
申请人： Realtek Semiconductor Corp.
发明人： Ming-Cheng Chiang , Li-Lung Kao
IPC分类号： H03M3/00 , H03M1/08 , H03M1/74 , H03M1/00 , G09G3/36
CPC分类号： H03M1/089 , G09G3/3648 , H03M1/00 , H03M1/0665 , H03M1/68 , H03M1/747 , H03M1/806 , H03M3/30 , H03M3/502
摘要： Hybrid digital-to-analog converter and method thereof are provided. The hybrid digital-to-analog converter (DAC) includes a data processor, at least one first type DAC, at least one second type DAC, and an output circuit. The data processor processes an input digital signal to output at least one of first and second digital signals which are related to a higher bit portion and a lower bit portion of the input digital signal, respectively. If the data processor outputs the first digital signal to the first type DAC, the first type DAC converts the first digital signal. The at least one second type DAC receives and converts the second digital signal outputted from the data processor. The output circuit receives at least one output signal of the first and the second type DACs to output an output analog signal.
摘要翻译：提供了混合数模转换器及其方法。混合数模转换器（DAC）包括数据处理器，至少一个第一类型DAC，至少一个第二类型DAC和输出电路。数据处理器处理输入数字信号以分别输出与输入数字信号的较高位部分和较低位部分相关的第一和第二数字信号中的至少一个。如果数据处理器将第一数字信号输出到第一类型DAC，则第一类DAC转换第一数字信号。所述至少一个第二类型DAC接收并转换从数据处理器输出的第二数字信号。输出电路接收第一和第二类型DAC的至少一个输出信号以输出输出模拟信号。

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