目前,在极高频率的电子装置或系统中不能采用数字信号处理的原因有两个:一是A/D转换器的速度不能达到足够快 二是信号处理任务太复杂,达不到实时处理的要求.-At present, in the high frequency of the electronic device or system cannot use the digital signal processing for two reasons: one is the A/D converter cannot reach the speed of fast enough　Second is the signal processing tasks too complex, can not reach the real-time process requirements.