基于谐波控制的高效率反馈振荡器

High Efficiency Feedback Oscillator Based on Harmonic-Control

本文设计了一种覆盖902-928MHz ISM频段的反馈振荡器,可同时作为电动汽车无线充电大功率输出末级功放的信号源和驱动功放。首先,利用谐波控制网络设计了一款高效率逆F类功率放大器。在此基础上,通过在功放的输入端口和输出端口之间设计合理的反馈(选频)网络实现了良好的自振荡效果。与单独设计信号源和驱动功放模块的传统方案相比,本设计将振荡器与驱动功放合二为一,有效地节省了成本与尺寸。仿真结果表明在振荡中心频率915MHz处的输出功率为38.907dBm,谐波抑制度大于46dBc,直流-射频转换效率为64.9%,偏离中心频率10kHz处相位噪声为-116.6dBc/Hz。

In this paper,a feedback oscillator covering the 902-928 MHz ISM frequency band is designed,which can be used as the signal source and driving power amplifier of the high-power output final power amplifier for wireless charging of electric vehicles at the same time.First,a high-efficiency inverse class-F power amplifier is designed by using the harmonic control network.On this basis,a good self-oscillation effect is realized by designing a reasonable feedback(frequency selection)network between the input port and the output port of the power amplifier.Compared with the traditional scheme of designing the signal source and the driving power amplifier module separately,this design combines the oscillator and the driving power amplifier into one,which effectively saves cost and size.The simulation results show that the output power at the oscillation center frequency of 915 MHz is 38.907 dBm,the harmonic suppression is greater than 46 dBc,the DC-RF conversion efficiency is 64.9%,and the phase noise is-116.6 dBc/Hz at a deviation of 10 kHz from the center frequency.