基于谐波插入的提高混频器线性度方法的研究

提出了将谐波插入用于提高混频器线性度的方法。该方法是将输出信号的二次谐波及二次互调产物反馈(插入)到输入端,通过非线性系统后产生的信号可抵消由原信号引入的交调产物,从而减少输出端交调失真的一种反馈技术。与前馈法相比,二次谐波插入法具有电路简单、性能稳定、成本低廉等优点,而且便于实现。谐波插入方法对中频三阶交调产物抑制作用明显。给出了该方法的理论分析并做了仿真实验。

An Approach of Harmonic-injection Used for Mixer Linearization

An approach of harmonicinjection used for mixer linearization is presented and demonstrated.The technique which is based on second harmonic and degenerated of output signals feed back to(be injected into)input terminal to generate offset signals for decrease output intermodulation distortion.Compared to feedforward approach,it has more simple circuit,stable performance and cost less,easier to realize.The third intermodulation products be decreased obviously.The paper gives the theory analysis and simulation.