Implementation of a high sampling rate waveform digitizer for wireless communication testing

The utilization of a digitizer is widely spread in the fields of RF/IF digital receiver, wireless communication testing, software defined radio and mixed signal analysis. This paper introduces a design methodology of a dual-channel wvaveform digitizer characterizing high speed and high resolution. This data acquisition system includes two channels collecting waveforms at a maximum sampling rate of 400MSa/s with a 12-bit A/D conversion resolution. Its 64M words memories and two acquisition modes enable data being accurately recorded. Among all the components contributing to achievement of the key specifications, three are especially critical -- correction for non-uniform sampling based on Hybrid Filter Bank (HFB), a DDR-based samples storage module and synchronization clock distribution with a unique BUS. Therefore, these three items are given priority to in the work.