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首页> 外文期刊>IEEE transactions on circuits and systems . I , Regular papers >Averaging and Cancellation Effect of High-Order Nonlinearity of a Power Amplifier
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Averaging and Cancellation Effect of High-Order Nonlinearity of a Power Amplifier

机译：功率放大器高阶非线性的平均和抵消效应

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Nonlinear distortion of a power amplifier (PA) due to the nonlinear input-output transfer function is studied. The high-order nonlinearity or Fourier components of the output, due to the mixing of input signals, are found to be related to an average integral related to the transfer function, thus giving insight to the cancellation effect of the nonlinearity. A simple formula has been derived to relate the nth-order Fourier component of a nonlinear transfer function with a sinusoidal input to an average integral of the nth-order derivative of the transfer function. The large signal nonlinear distortion of the nth-order can therefore be regarded as a weighted average of the nth-order derivative of the transfer function. For PAs, the averaging effect gives rise to local minima in the intermodulation distortion terms during power sweep because of the cancellation of the positive part and the negative part of the derivative during averaging. We have applied the formula to InGaP heterojunction bipolar transistors PAs and are able to explain most of the observed nonlinear phenomena of the amplifiers.
机译：研究了由于非线性输入输出传递函数引起的功率放大器（PA）的非线性失真。由于输入信号的混合，输出的高阶非线性或傅立叶分量被发现与与传递函数有关的平均积分有关，从而使人们对非线性的抵消效果有深刻的了解。导出了一个简单的公式，将非线性传递函数的n阶傅里叶分量与正弦输入关联到传递函数n阶导数的平均积分。因此，可以将n阶的大信号非线性失真视为传递函数的n阶导数的加权平均值。对于功率放大器，由于在求平均过程中导数的正负部分被抵消，因此平均效应在功率扫描期间引起互调失真项的局部最小值。我们已将该公式应用于InGaP异质结双极晶体管PA，并能够解释放大器中观察到的大多数非线性现象。

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