具有镜频抑制功能的可重构上变频器设计

Reconfigurable up-converter with image rejection design

介绍了一种带镜频抑制的可重构上变频器。它由FET混频器、压控振荡器(VCO)、低通滤波器及可调带通滤波器组合而成。这种上变频器能够将给定的中频信号变换成在一个宽的频率范围内期望的任意频率的射频信号,并保持高的镜频抑制水平。随着VCO输出频率的变化,镜频、本振和谐波频率同样发生变化并有可能产生混叠。

This paper presents a reconfigurable up-converter with image rejection. It consists of an FET mixer, a VCO, a low-pass filter and a tunable bandpass filter. It can shift a given input IF signal to any desired RF frequency within a wide frequency range while maintaining high image rejection level. With the change of VCO output frequency, the image, LO and harmonic frequencies also shift and maybe overlap.