首先对数字高清晰度电视(HDTV)接收机中频放大器的非线性进行了分析.为了减小中频放大器的非线性失真,提出了一种优化的串并结构的中频放大器.经PSPICE仿真证明,它能有效地减小各次谐波及三次交调、互调等无用分量,增加输入信号的动态范围.并对两级放大器并联电路的元件值进行了误差模拟,模拟结果说明这种串并结构的中频放大器可用集成电路实现 Firstly, the nonlinearity of the intermediate frequency amplifier of the digital HDTV receiver was analyzed.In order to reduce the nonlinear distortion of the intermediate frequency amplifier, an optimized intermediate frequency amplifier with serial-parallel structure was proposed.It was proved by PSPICE simulation that it Can effectively reduce the harmonics and the third intermodulation, intermodulation and other unwanted components, increasing the dynamic range of the input signal.And the two-stage amplifier parallel circuit component value error simulation, the simulation results show that the string structure IF amplifier can be used to achieve integrated circuits