基于开环功率补偿的窄脉冲调制信号稳幅技术

The Technique of Amplitude Stabilization of Narrow Pulse Modulated Signal Based on Power Compensation in ALC Open Loop Mode

信号源在窄脉冲调制下存在功率漂移和功率突变的问题,先前的解决方法是使用功率搜索。由于功率搜索方式效率低下且无法在扫描模式中使用,本文提出了一种开环功率补偿方法,它以闭环功率的检波电压为参考,将开环时的检波电压校准到该参考上。该方法已经应用到多款信号源中并解决了窄脉冲调制时信号源功率漂移及功率突变的问题,在功率为0dBm时其开环功率准确度可达±0.6dBm。

The power of signal often shift and jump in narrow pulse modulation in signal generator.And power search is used to solve this problem.But this method has very low efficiency and can’t be used in sweep mode.To solve this problem,a method base on power compensation in ALC open loop mode is introduce in this paper which use the detector voltage in ALC close-loop mode as the reference and use the detector voltage in ALC open-loop mode to calibrate the reference.This method has been used in several types of signal generator and has solved the power shift and power jump in narrow pulse modulation.The accuracy of power level in ALC open loop mode is ＋/-0.6dB when the power level is set to 0dBm.