现实误差下混合滤波器组性能改进

Improving of the Performance of Hybrid Filter Banks A/D Converters to Realization Errors

将模拟器件偏差、增益偏差、偏置偏差、量化噪声等现实误差引入到混合滤波器组ADC系统中.导致整个系统的性能与理想情况下相比有较大幅下降.为了解决上述问题,采用中心频带法进行改进.理论计算和系统仿真表明,该方法能有效地抑制系统性能的下降,可以降低混叠误差50 dB以上,降低失真误差2个数量级,提升系统信噪比40 dB.

The realization errors such as analog imperfections,gain errors,offset errors and quantization noises are introduced into the hybrid filter banks(HFB) ADC system.It is shown that no matter what kind of errors it is,it has a dramatic influence on the performance of the HFB.Therefore,a method called Central Frequency is presented to improve the performance.The validity is proved by theoretic calculation and behavior simulation.The HFB system s aliasing errors decrease above 50 dB,the distortion errors decreas...