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1. 发明授权

US07015753B2 Digital signal processing based implementation of a feed forward amplifier 有权
标题翻译：基于数字信号处理的前馈放大器的实现
公开(公告)号：US07015753B2
公开(公告)日：2006-03-21
申请号：US10859392
申请日：2004-06-02
申请人： Richard D. Posner , James Beasley
发明人： Richard D. Posner , James Beasley
IPC分类号： H03F1/26
CPC分类号： H03F1/26 , H03F1/3229
摘要： A digital signal processing based feed forward amplifier includes a delay circuit which receives a portion of the input signal and generates a delayed input signal. A first analog to digital converter receives another portion of the input signal and generates a digitized input signal. A main amplifier receives the delayed input signal and generates a main amplified signal. A second analog to digital converter receives at least a portion of the main amplified signal and converts it to a digitized main amplified signal. A digital signal processor receives the digitized input signal and the digitized main amplified signal and generates a digitized error signal. The digitized error signal is converted to an analog error signal by a digital to analog converter. An error amplifier receives the analog error signal and amplifies it to generate an amplified error signal. This error signal includes a noise and distortion component which is substantially the same in magnitude as the noise and distortion component of the main amplified signal. The amplified error signal and the main amplified signal are combined so that the noise and distortion components of each subtract, leaving substantially only the amplified desired signal component remaining in the amplified input signal, which is outputted by the feed forward amplifier. A third analog to digital converter converts a portion of the amplified error signal to a digitized amplified error signal, and a fourth analog to digital converter converts a portion of the output signal to a digitized output signal. The digitized output signal and the digitized amplified error signal are provided to the digital signal processor which generates the digitized error signal in response thereto.
摘要翻译：基于数字信号处理的前馈放大器包括延迟电路，其接收输入信号的一部分并产生延迟的输入信号。第一模数转换器接收输入信号的另一部分并产生数字化的输入信号。主放大器接收延迟输入信号并产生主放大信号。第二模数转换器接收主放大信号的至少一部分并将其转换为数字化的主放大信号。数字信号处理器接收数字化的输入信号和数字化的主放大信号并产生数字化的误差信号。数字化误差信号由数模转换器转换为模拟误差信号。误差放大器接收模拟误差信号并对其进行放大以产生放大的误差信号。该误差信号包括与主放大信号的噪声和失真分量基本上相同的噪声和失真分量。放大的误差信号和主放大信号被组合，使得每个的噪声和失真分量相减，基本上只剩下由前馈放大器输出的被放大的输入信号中放大的期望信号分量。第三模数转换器将放大的误差信号的一部分转换成数字化的放大误差信号，并且第四模数转换器将输出信号的一部分转换成数字化的输出信号。数字化输出信号和数字化放大误差信号被提供给数字信号处理器，该数字信号处理器响应于此产生数字化的误差信号。

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