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公开(公告)号：US08638836B2
公开(公告)日：2014-01-28
申请号：US12551495
申请日：2009-08-31
IPC分类号： H04B1/38
CPC分类号： H04B1/525
摘要： A transceiver mitigates signal leakage into a receive path from a transmit path. A subtraction circuit determines a difference between a receive signal and a compensation signal to produce a compensated receive signal prior to demodulation by a demodulator. An equalizer both amplitude adjusts and phase adjusts orthogonal baseband transmit signals based on the difference from the subtraction circuit to produce the compensation signal. A digital tuning circuit determines at least one amplitude adjust coefficient to be used by the equalizer. The equalizer can have a polarity switch or a variable attenuator or a variable delay.
摘要翻译： 收发信机从发送路径减轻信号泄漏到接收路径。 减法电路确定接收信号和补偿信号之间的差异，以在由解调器解调之前产生经补偿的接收信号。 均衡器两者都基于与减法电路的差异来调整和相位调整正交基带发射信号，产生补偿信号。 数字调谐电路确定要由均衡器使用的至少一个幅度调整系数。 均衡器可以具有极性开关或可变衰减器或可变延迟。
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2.发明授权公开(公告)号：US08278902B2
公开(公告)日：2012-10-02
申请号：US12503807
申请日：2009-07-15
IPC分类号： G05F1/56
摘要： A switching power converter converts an input DC voltage to an output DC voltage using a switch to selectively connect an input DC voltage energy source. A switching controller controls the switch. A pulse width modulation centering signal is generated by a spread spectrum clock signal generator. An error amplifier of the switching controller generates an analog error signal based on a switching voltage measured after the switching of the switching power converter, the output voltage of the switching power converter, the pulse width modulation centering signal and a reference. A pulse width modulated signal generator generates the pulse width modulation signal to control the switch of the switching power converter based on the pulse width modulation centering signal and the analog error signal.
摘要翻译： 开关电源转换器使用开关将输入DC电压转换为输出DC电压，以选择性地连接输入DC电压能量源。 开关控制器控制开关。 脉宽调制定心信号由扩频时钟信号发生器产生。 开关控制器的误差放大器基于开关电源转换器切换后的开关电压，开关功率转换器的输出电压，脉冲宽度调制对中信号和基准值，生成模拟误差信号。 脉冲宽度调制信号发生器产生脉冲宽度调制信号，以根据脉宽调制定心信号和模拟误差信号来控制开关功率转换器的开关。
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公开(公告)号：US08228117B2
公开(公告)日：2012-07-24
申请号：US12503816
申请日：2009-07-15
申请人： Pallab Midya , William J Roeckner
发明人： Pallab Midya , William J Roeckner
IPC分类号： H03F3/38
摘要： A switching audio amplifier circuit drives a switching audio amplifier stage using a digital PWM signal from an audio source. A PWM duty ratio modifier modifies an edge timing of the digital PWM signal to produce a modified digital PWM signal. A mode switch switches between the digital PWM signal and the modified digital PWM signal in a way that masks audible noise such as clicks and pops at power-up and power-down of the switching audio amplifier. An integrating error amplifier compares a difference between the digital PWM signal and an amplified PWM signal and integrates the difference to control the edge timing modified by the PWM duty ratio modifier. A mode controller can apply an offset signal to the integrating error amplifier and can control the switching of the mode switch.
摘要翻译： 开关音频放大器电路使用来自音频源的数字PWM信号驱动开关音频放大器级。 PWM占空比修改器修改数字PWM信号的边沿定时，以产生修改的数字PWM信号。 模式开关在数字PWM信号和修改的数字PWM信号之间切换，以掩盖在开关音频放大器的上电和掉电时的可听到的噪声，例如咔嗒声和咔嗒声。 积分误差放大器将数字PWM信号和放大的PWM信号之间的差异进行比较，并将差值积分，以控制由PWM占空比修正器修改的边沿时序。 模式控制器可以将偏移信号应用于积分误差放大器，并可以控制模式开关的切换。
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公开(公告)号：US07825726B2
公开(公告)日：2010-11-02
申请号：US12262127
申请日：2008-10-30
IPC分类号： H03F3/38
CPC分类号： H03F3/217
摘要： A switching amplifier drives a load or audio transducer. A digital integral noise shaping circuit converts a digital input such as audio content to an output digital pulse width modulated signal using an integrator. The integrator integrates the digital input, a variable frequency reference pulse width modulated signal and an inverse of the output digital pulse width modulated signal. A half bridge amplifier receives the output digital pulse width modulated signal and drives the load or audio transducer. A variable frequency generator generates the variable frequency reference pulse width modulated signal with an approximately equal duty ratio or alternatively varies the variable frequency pulse width modulated signal above and below about a fifty percent duty ratio.
摘要翻译： 开关放大器驱动负载或音频传感器。 数字积分噪声整形电路使用积分器将诸如音频内容的数字输入转换为输出数字脉宽调制信号。 积分器将数字输入，可变频率参考脉冲宽度调制信号和输出数字脉宽调制信号的反相相结合。 半桥放大器接收输出数字脉宽调制信号并驱动负载或音频传感器。 可变频率发生器以大致相等的占空比产生可变频率参考脉冲宽度调制信号，或者可选地改变高于和低于约百分之五十占空比的可变频率脉宽调制信号。
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